subject:(Storm Track)

Georgia Tech

1. Lu, Yi. Dynamical footprints of aerosols in extratropical atmospheric disturbances and circulation: A modeling analysis.

Degree: PhD, Earth and Atmospheric Sciences, 2017, Georgia Tech

URL: http://hdl.handle.net/1853/60651

► Synoptic-scale atmospheric disturbances occupy extratropics in wintertime and form extratropical “storm tracks”. These disturbances not only influence day-to-day weather variability but also modulate regional climates.… (more)

▼ Synoptic-scale atmospheric disturbances occupy extratropics in wintertime and form extratropical “storm tracks”. These disturbances not only influence day-to-day weather variability but also modulate regional climates. The region of the North Pacific storm track is also known to be characterized by high concentrations of atmospheric aerosols, making it an ideal location for investigating the interaction between aerosols and extratropical disturbances. In the first part of the study, we investigate the aerosol indirect effects on the development of idealized baroclinic waves in the Weather Research and Forecasting (WRF) model. Doubling of cloud droplet number concentration (to mimic the aerosol indirect effects) in the model increases total cloud water in the model, enhances local latent heating and leads to a statistically significant strengthening of the wave. To take into account the effects of aerosol-convection interaction that had been omitted in the WRF experiments, the Superparameterized Community Atmosphere Model (SP-CAM) is adopted to examine the aerosol effects on developing extratropical cyclones in a more realistic environment. The result suggests that the growth rate of the cyclone is temporarily reduced with increased environmental aerosol concentrations. A convection–advection–moisture self-adjustment (CAMS) mechanism of aerosol–cyclone interaction is proposed to explain this finding. The last part of the study explores the collective effects of aerosols on multiple aspects of the northern extratropical circulation in boreal winter based on long-term perpetual winter simulations conducted with the SP-CAM. Analyses of local energetics of atmospheric disturbances reveal the underlying processes that lead to the strengthened activity of high-frequency (less than 10 days) disturbances and weakened activity of low-frequency (10 to 30 days) disturbances with an elevated level of aerosol emission. Also discussed are the implications of these findings for the short-term prediction of weather and long-term projection of climate change in the northern extratropics. Advisors/Committee Members: Deng, Yi (advisor), Black, Robert X. (committee member), Wang, Yuhang (committee member), Di Lorenzo, Emanuele (committee member), Wang, Jingfeng (committee member).

Subjects/Keywords: Extratropical cyclone; Aerosol effects; Storm track

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lu, Y. (2017). Dynamical footprints of aerosols in extratropical atmospheric disturbances and circulation: A modeling analysis. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/60651

Chicago Manual of Style (16^th Edition):

Lu, Yi. “Dynamical footprints of aerosols in extratropical atmospheric disturbances and circulation: A modeling analysis.” 2017. Doctoral Dissertation, Georgia Tech. Accessed January 17, 2021. http://hdl.handle.net/1853/60651.

MLA Handbook (7^th Edition):

Lu, Yi. “Dynamical footprints of aerosols in extratropical atmospheric disturbances and circulation: A modeling analysis.” 2017. Web. 17 Jan 2021.

Vancouver:

Lu Y. Dynamical footprints of aerosols in extratropical atmospheric disturbances and circulation: A modeling analysis. [Internet] [Doctoral dissertation]. Georgia Tech; 2017. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1853/60651.

Council of Science Editors:

Lu Y. Dynamical footprints of aerosols in extratropical atmospheric disturbances and circulation: A modeling analysis. [Doctoral Dissertation]. Georgia Tech; 2017. Available from: http://hdl.handle.net/1853/60651

Louisiana State University

2. Binselam, Sait Ahmet. Geodatabase-assisted storm surge modeling.

Degree: PhD, Engineering Science and Materials, 2012, Louisiana State University

URL: etd-01162013-060632 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2061

► Tropical cyclone-generated storm surge frequently causes catastrophic damage in communities along the Gulf of Mexico. The prediction of landfalling or hypothetical storm surge magnitudes in… (more)

▼ Tropical cyclone-generated storm surge frequently causes catastrophic damage in communities along the Gulf of Mexico. The prediction of landfalling or hypothetical storm surge magnitudes in U.S. Gulf Coast regions remains problematic, in part, because of the dearth of historic event parameter data, including accurate records of storm surge magnitude (elevation) at locations along the coast from hurricanes. While detailed historical records exist that describe hurricane tracks, these data have rarely been correlated with the resulting storm surge, limiting our ability to make statistical inferences, which are needed to fully understand the vulnerability of the U.S. Gulf Coast to hurricane-induced storm surge hazards. This dissertation addresses the need for reliable statistical storm surge estimation by proposing a probabilistic geodatabase-assisted methodology to generate a storm surge surface based on hurricane location and intensity parameters on a single desktop computer. The proposed methodology draws from a statistically representative synthetic tropical cyclone dataset to estimate hurricane track patterns and storm surge elevations. The proposed methodology integrates four modules: tropical cyclone genesis, track propagation, storm surge estimation, and a geodatabase. Implementation of the developed methodology will provide a means to study and improve long-term tropical cyclone activity patterns and predictions. Specific contributions are made to the current state of the art through each of the four modules. In the genesis module, improved representative data from historical genesis populations are achieved through implementation of a stratified-Monte-Carlo sampling method to simulate genesis locations for the North Atlantic Basin, avoiding potential non-representative clustering of sampled genesis locations. In the track module, the improved synthetic genesis locations are used as the starting point for a track location and intensity methodology that incorporates storm strength parameters into the synthetic tracks and improves the positional quality of synthetic tracks. In the surge module, high-resolution, computationally intensive storm surge model results are probabilistically integrated in a computationally fast-running platform. In the geodatabase module, historic and synthetic tropical cyclone genesis, track, and surge elevation data are combined for efficient storage and retrieval of storm surge data.

Subjects/Keywords: Storm Surge Modeling; Hurricane; Genesis; Tropical Cyclone Track; Artificial Neural Network; Storm Surge; Geodatabase

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Binselam, S. A. (2012). Geodatabase-assisted storm surge modeling. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-01162013-060632 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2061

Chicago Manual of Style (16^th Edition):

Binselam, Sait Ahmet. “Geodatabase-assisted storm surge modeling.” 2012. Doctoral Dissertation, Louisiana State University. Accessed January 17, 2021. etd-01162013-060632 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2061.

MLA Handbook (7^th Edition):

Binselam, Sait Ahmet. “Geodatabase-assisted storm surge modeling.” 2012. Web. 17 Jan 2021.

Vancouver:

Binselam SA. Geodatabase-assisted storm surge modeling. [Internet] [Doctoral dissertation]. Louisiana State University; 2012. [cited 2021 Jan 17]. Available from: etd-01162013-060632 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2061.

Council of Science Editors:

Binselam SA. Geodatabase-assisted storm surge modeling. [Doctoral Dissertation]. Louisiana State University; 2012. Available from: etd-01162013-060632 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2061

Penn State University

3. Hay, Stephanie Ella. A Global Analysis of the Atmospheric Available Energy and its Trends.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/22773

► The available energy is the sum of the internal and potential energies relative to an isothermal and hydrostatic equilibrium atmosphere. It includes both baroclinic and… (more)

▼ The available energy is the sum of the internal and potential energies relative to an isothermal and hydrostatic equilibrium atmosphere. It includes both baroclinic and convective contributions. The method used to determine the equilibrium atmosphere is general and includes contributions due to terrain, dry air, water vapor, and hydrometeors. The available energy of the atmosphere is calculated using monthly mean ECMWF ERA-Interim data from 1979 to 2012. The analysis is done for water vapor and dry air only, but the effects of hydrometeors are estimated. The effect of using a single climatological equilibrium temperature or allowing it to vary is demonstrated. The trends in the global available energy as well as in the global available energies of dry air and water vapor are examined in terms of annual and seasonal means. The geographical and vertical distribution of the available energy and the trends are also examined in terms of column integrals, zonal means, and tropical means. The available energy is also linearized to determine the available elastic and available potential contributions. Finally, the available energy is compared to traditional measures of available potential energy (e.g., the available potential energy of Lorenz, the convective available potential energy) and potential and kinetic energies. Globally, the dry air component accounts for approximately 80% of the available energy, with the rest being made up of that of water vapor. The analysis indicates that the global available energy of the atmosphere has been increasing over the period analyzed. Geographically, the largest values of available energy are near the surface in the tropics coincident with the highest sea surface temperatures and the equatorial rainforests, at the tropopause and in the upper stratosphere. Trends vary geographically and seasonally, though a common feature indicates that the Walker circulation is increasing in strength. Using a single equilibrium temperature found for that month, the available energy is calculated each six hours during the March 1993 “storm of the century” to evaluate the evolution of available energy in a mid-latitude cyclone. The cyclone modifies the mean available energy field up to 200 hPa, and depletes it near the center of the storm. The variability in the distribution of the vapor available energy is demonstrated in this case. Advisors/Committee Members: Peter R Bannon, Thesis Advisor/Co-Advisor.

Subjects/Keywords: available energy; walker circulation; atmospheric circulation; storm track

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hay, S. E. (2014). A Global Analysis of the Atmospheric Available Energy and its Trends. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22773

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hay, Stephanie Ella. “A Global Analysis of the Atmospheric Available Energy and its Trends.” 2014. Thesis, Penn State University. Accessed January 17, 2021. https://submit-etda.libraries.psu.edu/catalog/22773.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hay, Stephanie Ella. “A Global Analysis of the Atmospheric Available Energy and its Trends.” 2014. Web. 17 Jan 2021.

Vancouver:

Hay SE. A Global Analysis of the Atmospheric Available Energy and its Trends. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Jan 17]. Available from: https://submit-etda.libraries.psu.edu/catalog/22773.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hay SE. A Global Analysis of the Atmospheric Available Energy and its Trends. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22773

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Victoria University of Wellington

4. Carter, Lauren. Meridional temperature gradient and the midlatitude storm track.

Degree: 2018, Victoria University of Wellington

URL: http://hdl.handle.net/10063/7729

► The southern hemisphere’s atmospheric circulation experiences several annual and seasonal changes that are well documented and studied. The teleconnections between different variables are verified and… (more)

▼ The southern hemisphere’s atmospheric circulation experiences several annual and seasonal changes that are well documented and studied. The teleconnections between different variables are verified and used to explain variability in everyday climate and weather. Theories using physics are taught and published in textbooks to help us understand the connectivity and complexity of such a system. One theory is the meridional temperature gradient has a direct impact on the storm track. This thesis investigates that theory using the ERA-Interim dataset. The temperature gradient is a direct result of the temperature field, and depending on the latitudes you decide in which to constrain your gradient, the gradient experiences several changes. In the high latitudes, the southern annual oscillation created a two peaked pattern; the mid-latitudes display the expected seasonal mono peak pattern. The strong correlations seen in the high latitudes means that the gradient is driven by the patterns experienced at higher latitudes. The independence of behaviours displayed by the ocean sectors led to the research investigating the influences, looking at not just the hemisphere, but also each basin separately. The Pacific and Indian Ocean showed in several results to act independently from one another, in temperature gradients, wind field, and storm track position. The strong correlations between the temperature gradient and the wind field, as well as the storm track field show that the two are connected, as the theory suggests. If temperatures rise in the tropics, or decrease in the poles, then the temperature gradient will steepen. The pressure gradient force increases which pushes the thermal wind balance poleward, shifting the position of the westerlies. The area with the largest variation in the wind speed becomes the storm track, which would also shift poleward. Climatic factors such as the southern oscillation index, southern annular mode or Indian Ocean dipole show slight correlations with the temperature field, but have little to no influence on the temperature gradient itself. Precipitation levels in New Zealand are highly variable due to the nature of the countries location and topography. What was found was little connection between the northern part of the country and the storm track. However, closer proximity to the storm track, such as the south of the country, do experience a small amount of variation due to the storm tracks influence. Advisors/Committee Members: Renwick, James.

Subjects/Keywords: Meridional temperature gradient; Mid latitude storm track; southern hemisphere climate dynamics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Carter, L. (2018). Meridional temperature gradient and the midlatitude storm track. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/7729

Chicago Manual of Style (16^th Edition):

Carter, Lauren. “Meridional temperature gradient and the midlatitude storm track.” 2018. Masters Thesis, Victoria University of Wellington. Accessed January 17, 2021. http://hdl.handle.net/10063/7729.

MLA Handbook (7^th Edition):

Carter, Lauren. “Meridional temperature gradient and the midlatitude storm track.” 2018. Web. 17 Jan 2021.

Vancouver:

Carter L. Meridional temperature gradient and the midlatitude storm track. [Internet] [Masters thesis]. Victoria University of Wellington; 2018. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/10063/7729.

Council of Science Editors:

Carter L. Meridional temperature gradient and the midlatitude storm track. [Masters Thesis]. Victoria University of Wellington; 2018. Available from: http://hdl.handle.net/10063/7729

5. Stanfield, Ryan Evan. Assessment Of Nasa Giss Cmip5 Modele Simulated Clouds And Toa Radiation Budgets Using Satellite Observations Over The Southern Mid-Latitudes.

Degree: MS, Atmospheric Sciences, 2012, University of North Dakota

URL: https://commons.und.edu/theses/1380

► Past, current, and future climates have been simulated by the National Aeronautics and Space Administration (NASA) Goddard Institute for Space Studies (GISS) ModelE Global… (more)

▼ Past, current, and future climates have been simulated by the National Aeronautics and Space Administration (NASA) Goddard Institute for Space Studies (GISS) ModelE Global Circulation Model (GCM) and summarized by the Intergovernmental Panel on Climate Change Fourth Assessment Report (IPCC, AR4). New simulations from the updated CMIP5 version of the NASA GISS ModelE GCM were recently released to the public community during the summer of 2011 and will be included in the upcoming IPCC AR5 ensemble of simulations. Due to the recent nature of these simulations, they have not yet been extensively validated against observations. To assess the NASA GISS-E2-R GCM, model simulated clouds and cloud properties are compared to observational cloud properties derived from the Clouds and Earth's Radiant Energy System (CERES) project using MODerate Resolution Imaging Spectroradiometer (MODIS) data for the period of March 2000 through December 2005. Over the 6-year period, the global average modeled cloud fractions are within 1% of observations. However, further study however shows large regional biases between the GCM simulations and CERES-MODIS observations. The southern mid-latitudes (SML) were chosen as a focus region due to model errors across multiple GCMs within the recent phase 5 of the Coupled Model Intercomparison Project (CMIP5). Over the SML, the GISS GCM undersimulates total cloud fraction over 20%, but oversimulates total water path by 2 g m-2. Simulated vertical cloud distributions over the SML when compared to both CERES-MODIS and CloudSat/CALIPSO observations show a drastic undersimulation of low level clouds by the GISS GCM, but higher fractions of thicker clouds. To assess the impact of GISS simulated clouds on the TOA radiation budgets, the modeled TOA radiation budgets are compared to CERES EBAF observations. Because modeled low-level cloud fraction is much lower than observed over the SML, modeled reflected shortwave (SW) flux at the TOA is 13 W m-2 lower and outgoing longwave radiation (OLR) is 3 W m-2 higher than observations. Finally, cloud radiative effects (CRE) are calculated and compared with observations to fully assess the impact of clouds on the TOA radiation budgets. The difference in clear-sky reflected SW flux between model and observation is only +4 W m-2 while the SW CRE difference is up to 17 W m-2, indicating that most of the bias in SW CRE results from the all-sky bias between the model and observation. A sizeable negative bias of 10 W m-2 in simulated clear-sky OLR has been found due to a dry bias in calculating observed clear-sky OLR and lack of upper-level water vapor at the 100-mb level in the model. The dry bias impacts LW CRE, with the model undersimulating by 13 W m-2. The net CRE difference is only 5 W m-2 due to the cancellation of SW and LW CRE biases. Advisors/Committee Members: Xiquan Dong.

Subjects/Keywords: CERES-MODIS; GCM; ModelE; NASA-GISS; Southern Mid-latitudes; Southern Mid-latitude storm track

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Stanfield, R. E. (2012). Assessment Of Nasa Giss Cmip5 Modele Simulated Clouds And Toa Radiation Budgets Using Satellite Observations Over The Southern Mid-Latitudes. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/1380

Chicago Manual of Style (16^th Edition):

Stanfield, Ryan Evan. “Assessment Of Nasa Giss Cmip5 Modele Simulated Clouds And Toa Radiation Budgets Using Satellite Observations Over The Southern Mid-Latitudes.” 2012. Masters Thesis, University of North Dakota. Accessed January 17, 2021. https://commons.und.edu/theses/1380.

MLA Handbook (7^th Edition):

Stanfield, Ryan Evan. “Assessment Of Nasa Giss Cmip5 Modele Simulated Clouds And Toa Radiation Budgets Using Satellite Observations Over The Southern Mid-Latitudes.” 2012. Web. 17 Jan 2021.

Vancouver:

Stanfield RE. Assessment Of Nasa Giss Cmip5 Modele Simulated Clouds And Toa Radiation Budgets Using Satellite Observations Over The Southern Mid-Latitudes. [Internet] [Masters thesis]. University of North Dakota; 2012. [cited 2021 Jan 17]. Available from: https://commons.und.edu/theses/1380.

Council of Science Editors:

Stanfield RE. Assessment Of Nasa Giss Cmip5 Modele Simulated Clouds And Toa Radiation Budgets Using Satellite Observations Over The Southern Mid-Latitudes. [Masters Thesis]. University of North Dakota; 2012. Available from: https://commons.und.edu/theses/1380

University of Washington

6. Geiss, Andrew Vincent. Multi-year Trends in MODIS and MISR Observed Cloud Fraction over the Extratropical Oceans.

Degree: 2016, University of Washington

URL: http://hdl.handle.net/1773/36487

► Examination of cloud fraction and top of atmosphere radiation data from NASA’s MISR, MODIS, and CERES instruments reveals a pervasive temporal decline in optically thick… (more)

Subjects/Keywords: Climate; Cloud Fraction; MISR; MODIS; Storm Track; Trends; Climate change; Remote sensing; atmospheric sciences

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Geiss, A. V. (2016). Multi-year Trends in MODIS and MISR Observed Cloud Fraction over the Extratropical Oceans. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/36487

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Geiss, Andrew Vincent. “Multi-year Trends in MODIS and MISR Observed Cloud Fraction over the Extratropical Oceans.” 2016. Thesis, University of Washington. Accessed January 17, 2021. http://hdl.handle.net/1773/36487.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Geiss, Andrew Vincent. “Multi-year Trends in MODIS and MISR Observed Cloud Fraction over the Extratropical Oceans.” 2016. Web. 17 Jan 2021.

Vancouver:

Geiss AV. Multi-year Trends in MODIS and MISR Observed Cloud Fraction over the Extratropical Oceans. [Internet] [Thesis]. University of Washington; 2016. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1773/36487.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Geiss AV. Multi-year Trends in MODIS and MISR Observed Cloud Fraction over the Extratropical Oceans. [Thesis]. University of Washington; 2016. Available from: http://hdl.handle.net/1773/36487

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

7. Sutton, Lindsay R. Comparison of Simulated and Observed Severe Storm Tracks over Alberta.

Degree: MS, Department of Earth and Atmospheric Sciences, 2015, University of Alberta

URL: https://era.library.ualberta.ca/files/cmc87pq289

► Thunderstorms have the potential to produce severe weather and can result in significant financial and human losses. The province of Alberta is one of Canada’s… (more)

▼ Thunderstorms have the potential to produce severe weather and can result in significant financial and human losses. The province of Alberta is one of Canada’s most active thunderstorm regions, with the record for insured damage due to hail. Therefore, it is crucial that thunderstorm forecasts be as accurate as possible to provide early warning to industry and the public. Numerical Weather Prediction (NWP) models are heavily utilized to provide forecast guidance. Recent advances in computing power and affordability have enabled the use of finer spatial resolutions that allow for the explicit simulation of individual storms, that is, without the use of a cumulus parameterization scheme. There is a need to explore the forecast skill of these high-resolution models as they find their way into forecast operations. This thesis investigates the skill of the widely available Weather Research and Forecasting (WRF) model for predicting the motion of thunderstorms. We use a 4 km resolution, a value that is found to be sufficient for accurately reproducing storm structure and evolution without requiring too many computational resources. Our focus is on a select set of severe summer storms that occurred in Alberta during 2011 and 2012. We compare the WRF simulated and observed radar reflectivity values and present the differences, with an emphasis on the motion and intensity of the storms. We find that storms produced by the WRF model move faster, travel farther, and have more counter clockwise tracks than radar-observed storms. WRF storms are also found to be less intense in terms of reflectivity (dBZ). We also investigate the accuracy of the Traditional Method and Bunkers Method for forecasting storm motion. These methods are frequently used by forecasters because they are relatively easy to employ on an observed or model sounding, and there is no need to rely on the results of a high-resolution model. We find that both methods tend to underestimate storm speed and overestimate storm direction when used on WRF model forecast soundings over Alberta.

Subjects/Keywords: Traditional Method; Alberta; Bunkers Method; mean wind; severe thunderstorm; weather forecasting; storm motion; high resolution model; weather radar; 30R75; WRF model; storm track; convection; cumulus parameterization; Numerical Weather Prediction

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sutton, L. R. (2015). Comparison of Simulated and Observed Severe Storm Tracks over Alberta. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cmc87pq289

Chicago Manual of Style (16^th Edition):

Sutton, Lindsay R. “Comparison of Simulated and Observed Severe Storm Tracks over Alberta.” 2015. Masters Thesis, University of Alberta. Accessed January 17, 2021. https://era.library.ualberta.ca/files/cmc87pq289.

MLA Handbook (7^th Edition):

Sutton, Lindsay R. “Comparison of Simulated and Observed Severe Storm Tracks over Alberta.” 2015. Web. 17 Jan 2021.

Vancouver:

Sutton LR. Comparison of Simulated and Observed Severe Storm Tracks over Alberta. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2021 Jan 17]. Available from: https://era.library.ualberta.ca/files/cmc87pq289.

Council of Science Editors:

Sutton LR. Comparison of Simulated and Observed Severe Storm Tracks over Alberta. [Masters Thesis]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/cmc87pq289

Texas A&M University

8. Ma, Xiaohui. A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes.

Degree: PhD, Oceanography, 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/153332

► Frontal-scale air-sea interactions during boreal winter season in midlatitude western boundary current (WBC) regimes, including the Kuroshio Extension Region (KER) and Gulf Stream Region (GSR),… (more)

▼ Frontal-scale air-sea interactions during boreal winter season in midlatitude western boundary current (WBC) regimes, including the Kuroshio Extension Region (KER) and Gulf Stream Region (GSR), are investigated using both observational (reanalysis) data and regional climate model simulations. The focus of the study is on the KER in the North Pacific. Extreme flux events associated with cold air outbreaks (CAOs) in boreal winter in the KER of the Northwestern Pacific and the GSR of the Northwestern Atlantic are analyzed and compared based on different reanalysis datasets. A close relationship between extreme flux events over the KER/GSR and the Pacific Decadal Oscillation (PDO)/East Atlantic Pattern (EAP) is found with more frequent occurrence of extreme flux events during a positive PDO/EAP phase. Furthermore, the PDO/EAP may be explained as the rectified effects of the synoptic winter storms accompanied with the extreme flux events. A lag-composite analysis shows that event-day storms tend to have a preferred southeastward propagation path, potentially contributing to the southward shift of the storm track over the eastern North Pacific/Atlantic basin during positive PDO/EAP phase. Using an atmosphere-only model (Weather Research Forecasting, WRF) at 27 km, two ensembles of simulations were conducted for boreal winter season in the North Pacific to study the possible local and remote influence of meso-scale oceanic eddies in the KER on the atmosphere. Filtering out meso-scale oceanic eddies results in a deep tropospheric response along and downstream of the KER, including a significant decrease (increase) in winter season mean rainfall along the KER (west coast of US), a reduction of storm growth rate in the KER, and a southward shift of the jet stream and North Pacific storm track in the eastern North Pacific. A mechanism invoking moist baroclinic instability is proposed to link meso-scale oceanic eddies in the KER to largescale atmospheric circulations and weather patterns in the North Pacific. Using a high-resolution (9 km) coupled regional climate model (CRCM), three sets of experiment were performed to investigate potential feedbacks of ocean-eddy induced atmospheric response to the ocean. Filtering out meso-scale oceanic eddies during coupling causes a surface warming and a weak Kuroshio strength. Advisors/Committee Members: Chang, Ping (advisor), Lin, Xiaopei (committee member), Saravanan, R. (committee member), Hetland, Robert D. (committee member).

Subjects/Keywords: Frontal-Scale; Meso-Scale; Air-Sea Interaction; Kuroshio Extension; Gulf Stream; Storm Track; Extreme Flux Event; Eddy

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ma, X. (2014). A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153332

Chicago Manual of Style (16^th Edition):

Ma, Xiaohui. “A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes.” 2014. Doctoral Dissertation, Texas A&M University. Accessed January 17, 2021. http://hdl.handle.net/1969.1/153332.

MLA Handbook (7^th Edition):

Ma, Xiaohui. “A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes.” 2014. Web. 17 Jan 2021.

Vancouver:

Ma X. A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1969.1/153332.

Council of Science Editors:

Ma X. A Study of Frontal-Scale Air-Sea Interaction in Midlatitude Western Boundary Current Regimes. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153332

Texas A&M University

9. Forinash, Eric Matthew. An Investigation of the Effect of SST Mesoscale Variability on the Dynamics of the North Pacific Jet Stream and Storm Track.

Degree: MS, Atmospheric Sciences, 2019, Texas A&M University

URL: http://hdl.handle.net/1969.1/188732

► The effect of SST mesoscale variability on the dynamics of the North Pacific Jet Stream and Storm track is investigated based on simulations with a… (more)

Subjects/Keywords: Dynamics; SST mesoscale variability; ocean mesoscale eddies; Kuroshio Extension; North Pacific Jet Stream; North Pacific Storm Track

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Forinash, E. M. (2019). An Investigation of the Effect of SST Mesoscale Variability on the Dynamics of the North Pacific Jet Stream and Storm Track. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/188732

Chicago Manual of Style (16^th Edition):

Forinash, Eric Matthew. “An Investigation of the Effect of SST Mesoscale Variability on the Dynamics of the North Pacific Jet Stream and Storm Track.” 2019. Masters Thesis, Texas A&M University. Accessed January 17, 2021. http://hdl.handle.net/1969.1/188732.

MLA Handbook (7^th Edition):

Forinash, Eric Matthew. “An Investigation of the Effect of SST Mesoscale Variability on the Dynamics of the North Pacific Jet Stream and Storm Track.” 2019. Web. 17 Jan 2021.

Vancouver:

Forinash EM. An Investigation of the Effect of SST Mesoscale Variability on the Dynamics of the North Pacific Jet Stream and Storm Track. [Internet] [Masters thesis]. Texas A&M University; 2019. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1969.1/188732.

Council of Science Editors:

Forinash EM. An Investigation of the Effect of SST Mesoscale Variability on the Dynamics of the North Pacific Jet Stream and Storm Track. [Masters Thesis]. Texas A&M University; 2019. Available from: http://hdl.handle.net/1969.1/188732

George Mason University

10. Feng, Xuelei. Understanding Climate Variability and Global Climate Change Using High-resolution GCM Simulations .

Degree: 2016, George Mason University

URL: http://hdl.handle.net/1920/10589

► In this study, three climate processes are examined using long-term simulations from multiple climate models with increasing horizontal resolutions. These simulations include the European Center… (more)

Subjects/Keywords: Atmospheric sciences; General circulation model; Global warming; Gulf Stream; Oceanic front; Precipitation climatology and changes; Storm track variability and predictability

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Feng, X. (2016). Understanding Climate Variability and Global Climate Change Using High-resolution GCM Simulations . (Thesis). George Mason University. Retrieved from http://hdl.handle.net/1920/10589

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Feng, Xuelei. “Understanding Climate Variability and Global Climate Change Using High-resolution GCM Simulations .” 2016. Thesis, George Mason University. Accessed January 17, 2021. http://hdl.handle.net/1920/10589.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Feng, Xuelei. “Understanding Climate Variability and Global Climate Change Using High-resolution GCM Simulations .” 2016. Web. 17 Jan 2021.

Vancouver:

Feng X. Understanding Climate Variability and Global Climate Change Using High-resolution GCM Simulations . [Internet] [Thesis]. George Mason University; 2016. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1920/10589.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Feng X. Understanding Climate Variability and Global Climate Change Using High-resolution GCM Simulations . [Thesis]. George Mason University; 2016. Available from: http://hdl.handle.net/1920/10589

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

11. Kim, Who Myung. Understanding the Long-Term Change of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Twentieth Century.

Degree: PhD, Oceanography, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/149596

► The strength of the Atlantic meridional overturning circulation (AMOC) is believed to be associated with changes in surface buoyancy in the subpolar North Atlantic, which… (more)

▼ The strength of the Atlantic meridional overturning circulation (AMOC) is believed to be associated with changes in surface buoyancy in the subpolar North Atlantic, which naturally leads to a notion that the AMOC has been weakening under global warming. Yet, a variety source of observations and its assimilation into ocean circulation models have not supported such an AMOC decline so far. In this study, an aspect that has not been paid attention, regarding the maintenance of the AMOC strength, is explored: storm activity in the subpolar North Atlantic (NA). An analysis using reanalysis data shows that the wintertime turbulent heat flux variability in the LS deep convection region is largely controlled by a small number of extreme heat flux event days, suggesting a pivotal role of winter storms in prompting LS deep-water formation. A set of forced ocean-ice model simulations, in which synoptic winter storm activity associated with these event days is either suppressed or doubled over the subpolar NA, confirms the above analysis as the altered storm activity results in a substantial change in LS convection and the AMOC strength. These experiments also show an upward AMOC trend during the late twentieth century, the degree of which is to some extent related to the intensity of storm activity in the LS. The upward AMOC trend found in the first part of the dissertation opposes to a downward AMOC trend in the twentieth century coupled model simulations employing the identical ocean component. An analysis suggests that contrast to the ocean-ice model, storm activity in the LS convection region and associated heat flux decreases during the late twentieth century. Although there is also a buoyancy increase over the LS, the wintertime heat flux decrease appears to be a more dominant factor for a decrease in convection in the LS, as an increasing freshwater input from Arctic/Subarctic Ocean bypasses the interior LS along the western boundary current. Therefore, the downward AMOC trend in the coupled model can be linked ultimately to the decreasing storm activity over the LS. This study therefore suggests that storm activity over the major convection regions needs to be paid further attention in assessing AMOC variations, including long-term trend in response to a warming scenario, in future studies. Advisors/Committee Members: Chang, Ping (advisor), Stoessel, Achim (advisor), Saravanan, Ramalingam (committee member), Orsi, Alejandro (committee member).

Subjects/Keywords: Atlantic Meridional Overturning Circulation; AMOC; AMOC trend; AMOC variability; North Atlantic storm track; extratropical storms; oceanic deep convection; deep convection; Labrador Sea; POP2; CCSM4; CMIP5

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kim, W. M. (2013). Understanding the Long-Term Change of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Twentieth Century. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149596

Chicago Manual of Style (16^th Edition):

Kim, Who Myung. “Understanding the Long-Term Change of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Twentieth Century.” 2013. Doctoral Dissertation, Texas A&M University. Accessed January 17, 2021. http://hdl.handle.net/1969.1/149596.

MLA Handbook (7^th Edition):

Kim, Who Myung. “Understanding the Long-Term Change of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Twentieth Century.” 2013. Web. 17 Jan 2021.

Vancouver:

Kim WM. Understanding the Long-Term Change of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Twentieth Century. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/1969.1/149596.

Council of Science Editors:

Kim WM. Understanding the Long-Term Change of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Twentieth Century. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149596

12. Foussard, Alexis. Influence des tourbillons océaniques sur le rail des dépressions atmosphériques : Effect of oceanic eddies on atmospheric storm tracks.

Degree: Docteur es, Dynamique de l'atmosphère, 2018, Sorbonne université

URL: http://www.theses.fr/2018SORUS492

►

Cette thèse est consacrée à l'étude de la variabilité des rails des dépressions des moyennes latitudes induite par les anomalies de température de surface (SST)… (more)

▼

Cette thèse est consacrée à l'étude de la variabilité des rails des dépressions des moyennes latitudes induite par les anomalies de température de surface (SST) associées aux tourbillons océaniques. Les effets locaux et de grande échelle de ces tourbillons sur la couche limite et la troposphère libre sont analysés à partir de simulations atmosphériques à haute résolution. Un canal barocline périodique représente de manière idéalisée le rail des dépressions sur une aquaplanète, avec un forçage par des SST décrivant un front océanique et ses tourbillons. La première partie de la thèse traite de la réponse des basses couches de l'atmosphère, en lien avec les mécanismes d'ajustement de pression et de mélange vertical turbulent. L'ajustement de pression domine dans les conditions de vent faible, en accord avec la théorie. En présence d'un front de grande échelle, la direction du vent module également la stabilité des basses couches : pour des vents forts venant du côté chaud du front, la réponse atmosphérique est aussi dominée par une réponse en ajustement de pression, à l'inverse des vents de direction opposée. Cela montre que les mécanismes de réponse sont déterminés par la variabilité rapide de l'atmosphère. La divergence de tension de surface est, comme dans les observations, linéairement reliée au gradient de SST. Pour certaines conditions, la divergence du vent horizontal peut cependant présenter une réponse proportionnelle au laplacien de température de la couche limite. Ceci concerne une gamme d'échelles allant de 100 à 500 km. La seconde partie de la thèse compare la réponse atmosphérique à un champ de tourbillons à une expérience témoin caractérisée par un front de SST zonalement symétrique. Des déplacements vers le pôle du rail des dépressions et du courant-jet apparaissent, tous deux faibles mais statistiquement robustes. Les forçages à la surface conduisent à une réponse locale dans la troposphère libre, qui est dominée par la variabilité synoptique. L'asymétrie de réponses aux tourbillons chauds et froids engendre aussi une augmentation des flux de surface moyens, qui permet d'interpréter une grande partie de la réponse de grande échelle. Les déplacements vers le pôle sont expliqués à partir des bilans de chaleur et d'énergie mécanique du rail des dépressions. Le dégagement additionnel de chaleur latente, qui se produit dans les tempêtes, joue un rôle primordial dans ces deux bilans.

This thesis aims to understand how sea surface temperature (SST) anomalies associated with mesoscale oceanic eddies may contribute to mid-latitude storm tracks variability. Based on idealized high resolution atmospheric simulations, local and large scale remote influences of the eddies onto the boundary layer and the free troposphere are investigated. Basic configuration is a generic baroclinic channel above an eddying SST front. The first part of the manuscript deals with the response of the atmosphere in the boundary layer, based on the well-known mechanisms of pressure adjustment and vertical mixing of momentum. As…

Advisors/Committee Members: Lapeyre, Guillaume (thesis director), Plougonven, Riwal (thesis director).

Subjects/Keywords: Interactions océan-atmosphère; Moyennes latitudes; Rail des tempêtes; Tourbillons océaniques; Courant-jet; Couche limite atmosphérique; Air-sea interactions; Midlatitudes; Oceanic eddies; Storm track; Jet stream; Boundary layer; 551.55

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Foussard, A. (2018). Influence des tourbillons océaniques sur le rail des dépressions atmosphériques : Effect of oceanic eddies on atmospheric storm tracks. (Doctoral Dissertation). Sorbonne université. Retrieved from http://www.theses.fr/2018SORUS492

Chicago Manual of Style (16^th Edition):

Foussard, Alexis. “Influence des tourbillons océaniques sur le rail des dépressions atmosphériques : Effect of oceanic eddies on atmospheric storm tracks.” 2018. Doctoral Dissertation, Sorbonne université. Accessed January 17, 2021. http://www.theses.fr/2018SORUS492.

MLA Handbook (7^th Edition):

Foussard, Alexis. “Influence des tourbillons océaniques sur le rail des dépressions atmosphériques : Effect of oceanic eddies on atmospheric storm tracks.” 2018. Web. 17 Jan 2021.

Vancouver:

Foussard A. Influence des tourbillons océaniques sur le rail des dépressions atmosphériques : Effect of oceanic eddies on atmospheric storm tracks. [Internet] [Doctoral dissertation]. Sorbonne université; 2018. [cited 2021 Jan 17]. Available from: http://www.theses.fr/2018SORUS492.

Council of Science Editors:

Foussard A. Influence des tourbillons océaniques sur le rail des dépressions atmosphériques : Effect of oceanic eddies on atmospheric storm tracks. [Doctoral Dissertation]. Sorbonne université; 2018. Available from: http://www.theses.fr/2018SORUS492

13. Hosseinpour, Farnaz. Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics.

Degree: 2017, University of Nevada – Reno

URL: http://hdl.handle.net/11714/2094

► This study gained novel insights into mechanistic interactions of dust and smoke particles with large-scale climate dynamics. This study revealed that the variability Saharan dust… (more)

▼ This study gained novel insights into mechanistic interactions of dust and smoke particles with large-scale climate dynamics. This study revealed that the variability Saharan dust radiative properties is significantly linked to high-frequency atmospheric wave activity across the tropical Atlantic storm tracks, while the variability of smoke particles from the South African biomass burning is attributed by low-frequency oscillations of baroclinic instability of the region. We proposed that the impacts of Saharan Air Layer (SAL) on large-scale climate dynamics mainly occur through coupling of dust radiative forcing with eddy energetics of the African easterly jet-African easterly waves (AEJ-AEWs) systems. This study quantified the thermal/mechanical impacts of oceanic SAL on activity of the AEWs and the regional feedback of eddies onto the mean-circulations from a climatological point of view. We found that both upstream and downstream developments of eddy energy are affected by oceanic SAL radiative forcing. It is suggested that dust radiative forcing has the capability to affect the transient changes in baroclinic instability of the jet-wave system through eddy available potential energy, and contribute in exchange of kinetic energy between the AEWs and AEJ through baroclinic and barotropic conversions. This study discussed that Saharan dust radiative properties have both constructive and destructive effects on behaviors of the AEWs, which depend on structure of the waves at different time-scale: the eddy kinetic energy (EKE) of the 2—6-day ultrahigh-frequency waves are amplified in average 1-day after enhancing of dust radiative forcing, while the EKE of the 6—11-day intermediate-frequency waves weakens during dust storm events. In addition, over the western African monsoon (WAM) region and the entrance of the tropical Atlantic storm track, the 2—6-day filtered AEWs become more barotropic during oceanic SAL outbreaks. The anomalous changes in meridional and quadruple momentum fluxes of 2—6-day filtered AEWs, associated with enhanced dust in the oceanic SAL, tend to an easterly feedback onto the southern edge of the mean-AEJ. However, at the middle- to exit region of the southern storm track, the anomalous convergent momentum fluxes of 2—6-day AEWs, associated with dust outbreak, tends to increase the regional baroclinic instability through the 3 main local energy packets, which may initiate a higher chance of hurricane activity. Applying ensemble of large NASA satellite observations data sets, such as MODIS, SeaWiFS and TRMM as well as GOCART aerosol model and MERRA reanalysis indicates that the suggested results are consistent regardless of the selected data sets. Overall, we proposed that the regional radiative properties of aerosols and thermal/mechanical activity of wave-jet systems are dynamically coupled and it is not suggested to consider either as a response to one another. Advisors/Committee Members: Wilcox, Eric M. (advisor), Chakrabarty, Rajan (committee member), Kaplan, Michael (committee member), Mitchell, David (committee member), Arnott, Patrick (committee member).

Subjects/Keywords: Aerosol radiative forcing; dust storm; wave activity;

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hosseinpour, F. (2017). Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/2094

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hosseinpour, Farnaz. “Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics.” 2017. Thesis, University of Nevada – Reno. Accessed January 17, 2021. http://hdl.handle.net/11714/2094.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hosseinpour, Farnaz. “Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics.” 2017. Web. 17 Jan 2021.

Vancouver:

Hosseinpour F. Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics. [Internet] [Thesis]. University of Nevada – Reno; 2017. [cited 2021 Jan 17]. Available from: http://hdl.handle.net/11714/2094.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hosseinpour F. Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics. [Thesis]. University of Nevada – Reno; 2017. Available from: http://hdl.handle.net/11714/2094

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

14. Martins Varino, Filipa Catarina. Typologie des tempêtes du XXe siècle : XX century windstorms typology.

Degree: Docteur es, Océan, Atmosphère, Climat, 2017, Université Toulouse III – Paul Sabatier

URL: http://www.theses.fr/2017TOU30389

►

L'étude de la variabilité des cyclones extra-tropicaux (ETC) est non seulement un sujet d'intérêt pour la communauté scientifique mais aussi d'une grande importance en raison… (more)

▼

L'étude de la variabilité des cyclones extra-tropicaux (ETC) est non seulement un sujet d'intérêt pour la communauté scientifique mais aussi d'une grande importance en raison de ses impacts socio-économiques. Toutefois, l'étude continué de la variabilité des ETC et de leurs impacts est encore rare, en particulier a l'échelle de temps du Xeme siècle. Cette thèse vise a étudier la variabilité des trajectoires de tempêtes et de leurs dégâts associés du début du Xxeme siècle a 2010. Pour ce faire, le travail est divisé en deux sections principales, l'une dédiée a la climatologie des ETCs au cours du siècle dernier a partir de données de réanalyse, et la seconde centrée sur le calcul d'indices de pertes et l'évaluation des risques induits par les tempêtes. On s'intéresse en premier lieu a l'étude de la variabilité des ETCs par l'application d'un algorithme de suivi de cyclone, sur la réanalyse de long terme du Centre Européen (ECMWF) ERA-20C. Le nombre annuel d'ETC modérées a intenses fait ressortir trois périodes historiques distinctes. Deux périodes, l'une au début et la seconde à la fin du Xeme siècle (1900-1935 et 1980-2010) ne présentent aucune tendance tandis qu'au milieu du siècle (1930-1980) une tendance significative à l'augmentation apparait. Cette dernière peut toutefois être interrogée en raison de l'inhomogénéité temporelle des réanalyses de long terme. Pour cette raison, un ensemble de paramètres physiques sont analysés en vue d'interpréter physiquement les trois périodes. Durant la période 1930-1980, un refroidissement général de l'atmosphère est observé, en particulier aux hautes latitudes, qui augmente le gradient méridien de température et en conséquence la baroclinicité et la conversion barocline. Par ailleurs, cette augmentation de la fréquence d'ETC est observée spécifiquement sur le Pacifique (Atlantique) au cours de la première (seconde) moitié de la période en lien avec une inversion de l'indice Oscillation Décennale du Pacifique (Oscillation Multidecennale Atlantique). La seconde partie de la thèse s'intéresse à l'analyse des tempête scausant les plus forts dégâts du Xeme siècle. Tout d'abord, on calcule un champ d'indices de dégâts de vents forts pour plus de vingt pays. On développe ensuite une Méthode de Suivi de Tempêtes de Forts Dégâts et les résultats de l'algorithme de suivi sont combinés avec les indices de dégâts de vents forts pour chaque pays. [...]

Extratropical cyclones (ETCs) variability is not only a subject that raises interest among the scientific community, but also extremely important in terms of social-economical impacts. Nevertheless, the study of both the extratropical cyclones variability and windstorms impacts is still scarce, particularly at time-scales that cover the twentieth century. This thesis aims to study, both storms track variability and associated losses from the beginning of the 20th century until 2010. In order to do so, the work was separated in two main parts, one witch focus on ETCs climatology during the last century using reanalysis data and another…

Advisors/Committee Members: Arbogast, Philippe (thesis director), Rivière, Gwendal (thesis director), Joly, Bruno (thesis director).

Subjects/Keywords: Suivi de tempêtes; 20ème siècle; ERA-20C; Réchauffement arctique; Changement climatique; Dégâts; Courant de jet; Réassurance; Storm track; Cyclone tracking; 20th century; ERA-20C; Arctic warming; Climate change; Hazards jet stream; Reassurance

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Martins Varino, F. C. (2017). Typologie des tempêtes du XXe siècle : XX century windstorms typology. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2017TOU30389

Chicago Manual of Style (16^th Edition):

Martins Varino, Filipa Catarina. “Typologie des tempêtes du XXe siècle : XX century windstorms typology.” 2017. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed January 17, 2021. http://www.theses.fr/2017TOU30389.

MLA Handbook (7^th Edition):

Martins Varino, Filipa Catarina. “Typologie des tempêtes du XXe siècle : XX century windstorms typology.” 2017. Web. 17 Jan 2021.

Vancouver:

Martins Varino FC. Typologie des tempêtes du XXe siècle : XX century windstorms typology. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2017. [cited 2021 Jan 17]. Available from: http://www.theses.fr/2017TOU30389.

Council of Science Editors:

Martins Varino FC. Typologie des tempêtes du XXe siècle : XX century windstorms typology. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2017. Available from: http://www.theses.fr/2017TOU30389

University of Canterbury

15. Belcher, Danielle Marie. The Stable Isotopic Variations and the Hydrogeology of the Coronet Peak Skifield, Queenstown.

Degree: MS, Engineering Geology, 2009, University of Canterbury

URL: http://dx.doi.org/10.26021/5917

► This study aims to investigate the stable isotopic characteristics of meteoric and ground waters, and to obtain spring flow rates in the Coronet Peak Skifield,… (more)

▼ This study aims to investigate the stable isotopic characteristics of meteoric and ground waters, and to obtain spring flow rates in the Coronet Peak Skifield, Queenstown. Spring flows were gathered during the winters of 2008 and 2009, whilst water samples were collected from precipitation, springs, reservoirs and groundwater during July, August and September 2009. The spring flows were examined and the water samples were analysed for δD and δ¹⁸O values using the CF-IRMS at the University of Canterbury. A database has been gathered from all natural water sources to give a local meteoric water line (LMWL) for the area that fits clearly with the global meteoric water line. The LMWL has an R2 value of 0.97 and the equation is δD = 8 δ¹⁸O +10. An understanding of evaporation as it occurs in the water storage reservoirs of the mountain has also been obtained, giving rise to a local evaporation line. The stable isotope ratios of hydrogen and oxygen within precipitation have been used extensively to characterise the hydrogeology with emphasis on altitude effects, storm duration and variations in storm track trajectories. Of these three phenomena, it is the trajectory of the storm track that is best shown to affect the composition of precipitation in this area. The air masses advancing on the study area from the north being more depleted in their isotopic signatures, with approximate δD and δ¹⁸O values of –130‰ and -16‰. The air masses approaching from a southerly direction are more positive in comparison, having approximate δD and δ¹⁸O values of –65‰ and -9‰. The altitude effect in precipitation on the Skifield has led to an altitude gradient being found: for every 100-metre increase in elevation, δ¹⁸O decreases by 0.71‰. However there were some inconsistencies. The influence on precipitation from storm duration is also inconsistent in this area. The R2 values range from 0.14 to 0.99, but this method does not take into account the position of the individual samples. Some samples did not plot in the expected order that is governed by a decrease in stable isotopic ratios with storm duration. The stable isotopic compositions within meteoric waters can be used as tracers of water sources. The isotope date of the springs also infers an altitude effect. The springs gave an altitude gradient of a decrease –0.43‰ with each 100-metre increase in elevation. This indicates that precipitation is the main influence on the stable isotopic composition of the springs in this area. However, data shows differences between the current precipitation and the groundwater compositions, indicating that present precipitation is not flowing from the springs, past precipitation is. The stable isotopic compositions of the springs have also been correlated with groundwater isotope data and suggest the sources of the springs are groundwater dominated. Although some springs compositions indicate an influence by current precipitation. This is shown by a negative stable isotopic trend in the precipitation sampled in August, corresponding with a…

Subjects/Keywords: hydrogeology; stable isotopes; local meteoric water line; Coronet Peak; altitude effects; storm track trajectories

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Belcher, D. M. (2009). The Stable Isotopic Variations and the Hydrogeology of the Coronet Peak Skifield, Queenstown. (Masters Thesis). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/5917

Chicago Manual of Style (16^th Edition):

Belcher, Danielle Marie. “The Stable Isotopic Variations and the Hydrogeology of the Coronet Peak Skifield, Queenstown.” 2009. Masters Thesis, University of Canterbury. Accessed January 17, 2021. http://dx.doi.org/10.26021/5917.

MLA Handbook (7^th Edition):

Belcher, Danielle Marie. “The Stable Isotopic Variations and the Hydrogeology of the Coronet Peak Skifield, Queenstown.” 2009. Web. 17 Jan 2021.

Vancouver:

Belcher DM. The Stable Isotopic Variations and the Hydrogeology of the Coronet Peak Skifield, Queenstown. [Internet] [Masters thesis]. University of Canterbury; 2009. [cited 2021 Jan 17]. Available from: http://dx.doi.org/10.26021/5917.

Council of Science Editors:

Belcher DM. The Stable Isotopic Variations and the Hydrogeology of the Coronet Peak Skifield, Queenstown. [Masters Thesis]. University of Canterbury; 2009. Available from: http://dx.doi.org/10.26021/5917

Penn State University

16. Baggett, Cory Francis. SUNDRY STUDIES ON THE EDDY LIFE CYCLES ASSOCIATED WITH EKMAN PUMPING AND ARCTIC WARMING.

Degree: 2016, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/765371328

► Within the conceptual framework of the Lorenz energy cycle we use both reanalysis data and idealized model calculations to examine sundry atmospheric eddy life cycles.… (more)

▼ Within the conceptual framework of the Lorenz energy cycle we use both reanalysis data and idealized model calculations to examine sundry atmospheric eddy life cycles. First, we focus on the Southern Hemisphere and compare eddy life cycles that have been separated by the rate at which they generate eddy available potential energy through Ekman pumping. We find that when this generation is anomalously large, the eddies are amplified with higher values of eddy kinetic energy. We attribute the amplification of these eddies to anomalously low values of barotropic conversion during their decay phase. Next, we turn our attention to the Northern Hemisphere during its winter. We separate the eddies into two horizontal scales – planetary and synoptic. We find that the planetary-scale wave life cycle leads to more Arctic warming than the synoptic-scale wave life cycle. This greater warming occurs despite the equator-to-pole temperature gradient and hemispherically integrated values of zonal available potential energy being close to their climatological values preceding the life cycle. We conclude that the growth of the planetary-scale waves is not reliant on baroclinic instability and the flux-gradient relationship. Rather, we find that enhanced localized tropical convection over the Pacific warm pool excites the planetary-scale waves. These planetary-scale waves grow in the mid-latitudes as they tap the Earth’s vast reservoir of zonal available potential energy. They transport large quantities of sensible and latent heat into the Arctic which subsequently enhances downward infrared radiation and causes surface warming. An examination of the synoptic-scale cyclones during the planetary-scale wave life cycle reveals that over the North Pacific, individual cyclones and their attendant “atmospheric rivers” are diverted northward into the Arctic from their climatological storm track by an amplified planetary-scale ridge that resides over western North America. The cyclones contribute to the broader-scale surface warming by the planetary-scale waves themselves. Finally, we find that the Arctic surface warming observed during the full composite of synoptic-scale wave events is largely caused by a particular subset of events with enhanced planetary-scale wave activity. We discuss these results in the context of the Tropically Excited Arctic warMing (TEAM) mechanism and Arctic amplification. Advisors/Committee Members: Dr Sukyoung, Lee, Dissertation Advisor/Co-Advisor.

Subjects/Keywords: Planetary-scale wave life cyclesand synoptic-scale wave life cycles; Subseasonal to seasonal prediction; storm track dynamics; teleconnections; tropical convection; Siberian snow cover; Arctic amplification; climate dynamics; general circulation models (GFDL spectral dynamical core); numerical weather prediction (WRF); Planetary-scale wave life cycles; Synoptic-scale wave life cycles; Arctic warming; Ekman pumping; Tropical convection; Teleconnections

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Baggett, C. F. (2016). SUNDRY STUDIES ON THE EDDY LIFE CYCLES ASSOCIATED WITH EKMAN PUMPING AND ARCTIC WARMING. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/765371328

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Baggett, Cory Francis. “SUNDRY STUDIES ON THE EDDY LIFE CYCLES ASSOCIATED WITH EKMAN PUMPING AND ARCTIC WARMING.” 2016. Thesis, Penn State University. Accessed January 17, 2021. https://submit-etda.libraries.psu.edu/catalog/765371328.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Baggett, Cory Francis. “SUNDRY STUDIES ON THE EDDY LIFE CYCLES ASSOCIATED WITH EKMAN PUMPING AND ARCTIC WARMING.” 2016. Web. 17 Jan 2021.

Vancouver:

Baggett CF. SUNDRY STUDIES ON THE EDDY LIFE CYCLES ASSOCIATED WITH EKMAN PUMPING AND ARCTIC WARMING. [Internet] [Thesis]. Penn State University; 2016. [cited 2021 Jan 17]. Available from: https://submit-etda.libraries.psu.edu/catalog/765371328.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Baggett CF. SUNDRY STUDIES ON THE EDDY LIFE CYCLES ASSOCIATED WITH EKMAN PUMPING AND ARCTIC WARMING. [Thesis]. Penn State University; 2016. Available from: https://submit-etda.libraries.psu.edu/catalog/765371328

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

17. Michel, Clio. Rôle du déferlement des ondes de Rossby dans la variabilité climatique aux latitudes tempérées : The role of Rossby wave breakings in the climate variability at midlatitudes.

Degree: Docteur es, Océan, Atmosphère et Surfaces Continentales, 2012, INP Toulouse

URL: http://www.theses.fr/2012INPT0091

►

L'objectif de cette thèse a été d'analyser la dynamique de l'interaction entre les ondes baroclines (ou rail des dépressions) et la variabilité basse fréquence de… (more)

▼

L'objectif de cette thèse a été d'analyser la dynamique de l'interaction entre les ondes baroclines (ou rail des dépressions) et la variabilité basse fréquence de l'atmosphère aux moyennes latitudes. Deux approches distinctes ont été suivies pour étudier le rôle des déferlements d'ondes baroclines sur les courants-jets, l'une reposant sur les données réanalysées et l'autre sur des simulations numériques. La première partie de la thèse a plus précisément consisté à étudier le lien entre les déferlements d'ondes de Rossby et les quatre régimes de temps sur l'Atlantique Nord en hiver en utilisant les réanalyses ERA40. Le calcul des fréquences d'occurrence des déferlements d'ondes a montré que ceux-ci tendent généralement à renforcer les régimes sauf le blocage scandinave qui est détruit par du déferlement cyclonique au sud du Groenland. Ensuite, les précurseurs des transitions entre régimes de temps ont été identifiés. Le premier précurseur est relié à la propagation linéaire d'anomalies basse fréquence (période supérieure à 10 jours). Ce précurseur n'est pas systématique mais il survient durant la transition du régime zonal vers le blocage environ une semaine avant ce dernier où il prend la forme d'un train d'ondes quasi-stationnaire excité par des anomalies convectives dans l'Atlantique subtropical. Le second précurseur plus systématique intervient au niveau des interactions non-linéaires entre les tourbillons transitoires haute et basse fréquences et a pu être relié aux déferlements d'ondes. La formation et la destruction du blocage scandinave ont ensuite été plus particulièrement étudiées en analysant respectivement les transitions préférentielles du régime zonal au blocage et du blocage vers l'anticyclone groenlandais en lien avec les dépressions de surface et les déferlements d'ondes. Les dépressions de surface atteignent les mêmes intensités pendant la formation et la destruction du blocage mais ne suivent pas les mêmes trajectoires. Pendant la formation du blocage, les dépressions de surface ont des trajectoires rectilignes se dirigeant vers le nord de la Scandinavie et sont liées à un déferlement anticyclonique. Pendant la destruction du blocage, les trajectoires des dépressions de surface sont courbées sur l'Atlantique Nord en direction du Groenland et sont reliées à du déferlement cyclonique qui favorise ainsi l'apparition de l'anticyclone groenlandais. Notre analyse suggère que cette différence de comportement provient de la forme de l'écoulement basse fréquence qui n'est pas le même pendant la formation et la destruction du blocage et qui favorise un certain type de déferlement plutôt qu'un autre. Dans la seconde partie de la thèse, nous avons analysé le lien entre les températures de surface de la mer (SSTs) et le comportement du rail des dépressions avec le modèle de circulation générale de l'atmosphère Arpège-Climat en mode aquaplanète pour mieux comprendre les téléconnexions telles que l'Oscillation Arctique et/ou l'Oscillation Nord-Atlantique d'un point de vue idéalisé.

This thesis aims at analyzing…

Advisors/Committee Members: Rivière, Gwendal (thesis director), Terray, Laurent (thesis director).

Subjects/Keywords: Météorologie dynamique; Déferlements d'ondes de Rossby; Régimes de temps; Blocage; Rail des dépressions; Fronts de SST; Dynamic meteorology; Rossby wvave breaking; Weather regimes; Blocking; Storm track; SST fronts

…100 4.3.2. Climatologies de l’intensité du « storm-track » et de la position et de… …Bibliographie 143 Introduction Le rail des dépressions ou « storm-track » en anglais est une entité…

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Michel, C. (2012). Rôle du déferlement des ondes de Rossby dans la variabilité climatique aux latitudes tempérées : The role of Rossby wave breakings in the climate variability at midlatitudes. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2012INPT0091

Chicago Manual of Style (16^th Edition):

Michel, Clio. “Rôle du déferlement des ondes de Rossby dans la variabilité climatique aux latitudes tempérées : The role of Rossby wave breakings in the climate variability at midlatitudes.” 2012. Doctoral Dissertation, INP Toulouse. Accessed January 17, 2021. http://www.theses.fr/2012INPT0091.

MLA Handbook (7^th Edition):

Michel, Clio. “Rôle du déferlement des ondes de Rossby dans la variabilité climatique aux latitudes tempérées : The role of Rossby wave breakings in the climate variability at midlatitudes.” 2012. Web. 17 Jan 2021.

Vancouver:

Michel C. Rôle du déferlement des ondes de Rossby dans la variabilité climatique aux latitudes tempérées : The role of Rossby wave breakings in the climate variability at midlatitudes. [Internet] [Doctoral dissertation]. INP Toulouse; 2012. [cited 2021 Jan 17]. Available from: http://www.theses.fr/2012INPT0091.

Council of Science Editors:

Michel C. Rôle du déferlement des ondes de Rossby dans la variabilité climatique aux latitudes tempérées : The role of Rossby wave breakings in the climate variability at midlatitudes. [Doctoral Dissertation]. INP Toulouse; 2012. Available from: http://www.theses.fr/2012INPT0091

Open Access Theses and Dissertations