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University of Washington
1.
Penny, Sandra Marie.
The source of the midwinter suppression in storminess over the North Pacific.
Degree: 2013, University of Washington
URL: http://hdl.handle.net/1773/22533 
► Feature tracking techniques are employed to investigate why there is a relative mini- mum in storminess during winter within the Pacific storm track (the midwinter…
(more)
▼ Feature tracking techniques are employed to investigate why there is a relative mini- mum in storminess during winter within the Pacific storm track (the midwinter sup- pression). It is found that the frequency and amplitude of disturbances entering the Pacific storm track from mid-latitude Asia is reduced during winter relative to fall and spring, and that the magnitude of this reduction is more than sufficient to account for the midwinter suppression. Growth rates of individual disturbances are calculated and compared to expectations from linear theory for several regions of interest. While there are discrepancies between linear expectations and observed growth rates, the growth of disturbances within the Pacific storm track cannot explain why the mid- winter suppression exists. Furthermore, it is determined that the development of a wintertime reduction in storminess over mid-latitude Asia is consistent with linear expectations, which predict a wintertime minimum in Eady growth rates in this re- gion, mainly due to increased static stability. Several other mechanisms that may contribute to the initiation of the midwinter suppression over mid-latitude Asia are discussed, including the interaction between upper-level waves and topography, the behavior of waves upwind of the Tibetan plateau, and the initiation of lee cyclones.
Advisors/Committee Members: Battisti, David S (advisor).
Subjects/Keywords: Atmospheric sciences; atmospheric sciences
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APA (6th Edition):
Penny, S. M. (2013). The source of the midwinter suppression in storminess over the North Pacific. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/22533
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Penny, Sandra Marie. “The source of the midwinter suppression in storminess over the North Pacific.” 2013. Thesis, University of Washington. Accessed December 15, 2019.
http://hdl.handle.net/1773/22533.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Penny, Sandra Marie. “The source of the midwinter suppression in storminess over the North Pacific.” 2013. Web. 15 Dec 2019.
Vancouver:
Penny SM. The source of the midwinter suppression in storminess over the North Pacific. [Internet] [Thesis]. University of Washington; 2013. [cited 2019 Dec 15].
Available from: http://hdl.handle.net/1773/22533.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Penny SM. The source of the midwinter suppression in storminess over the North Pacific. [Thesis]. University of Washington; 2013. Available from: http://hdl.handle.net/1773/22533
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Washington
2.
Penny, Sandra Marie.
Storm Track Variability from the Perspective of Individual Storms.
Degree: PhD, 2013, University of Washington
URL: http://hdl.handle.net/1773/23476
► A combination of feature-tracking and variance techniques are employed to investigate synoptic-scale controls on mid-latitude storm tracks. Most notably, the way in which an upstream…
(more)
▼ A combination of feature-tracking and variance techniques are employed to investigate synoptic-scale controls on mid-latitude storm tracks. Most notably, the way in which an upstream wave source (a ``seed" disturbance) propagates downstream and acts to control a downstream storm track is investigated in detail for the observational record. It is found that, in general, about 17% of observed storminess within the two Northern Hemisphere storm tracks co-varies with the strength of the upstream wave source, and the relationship is robust throughout the cold season (October through April). Three specific cases are studied for the possible impacts of upstream waves: the relative minimum in storminess during winter within the Pacific storm track (the ``midwinter suppression"), the inverse relationship that exists between the strength of the Pacific storm track and the intensity of the Pacific jet stream in winter (the ``inverse relationship"), and the effects of Alpine lee cyclones (a canonical example of a ``seed" disturbance) on climatological timescales. These three are each summarized briefly below. It is shown that a reduction in the frequency and amplitude of disturbances entering the Pacific storm track from mid-latitude Asia is substantially reduced during winter relative to fall and spring and that the magnitude of this reduction is more than sufficient to account for the midwinter suppression. That the midwinter suppression is caused by upstream effects is unexpected based on expectations from previous work, and this is the first published evidence that an upstream wave source can have important consequences for a storm track downstream. It is shown that upstream seeding does not explain why winter months with a stronger-than-average Pacific storm track tend to have weaker-than-average jet streams (the ``inverse relationship"). Most notably, results show that the inverse relationship occurs because Pacific storm track disturbances are weaker and shorter-lived when the jet stream is the strongest; connections with the lifecycles of individual storms are implicated. Finally, Alpine lee cyclones are studied on climatological timescales to evaluate the synoptic events preceding surface cyclogenesis as well as the effects felt downstream due to these events. It is shown that Alpine lee cyclones are largely responsible for the location of the Mediterranean storm track, however it does not appear that the cyclones are surface-driven events on average. Instead, lee cyclones are most often cases of orographically-modified cyclogenesis, and represent cyclogenesis events that would have otherwise occurred in the region but that are geographically localized by the presence of the mountains.
Advisors/Committee Members: Battisti, David S (advisor).
Subjects/Keywords: Climate Dynamics; Jet Streams; Storm Tracks; Atmospheric sciences; atmospheric sciences
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APA (6th Edition):
Penny, S. M. (2013). Storm Track Variability from the Perspective of Individual Storms. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/23476
Chicago Manual of Style (16th Edition):
Penny, Sandra Marie. “Storm Track Variability from the Perspective of Individual Storms.” 2013. Doctoral Dissertation, University of Washington. Accessed December 15, 2019.
http://hdl.handle.net/1773/23476.
MLA Handbook (7th Edition):
Penny, Sandra Marie. “Storm Track Variability from the Perspective of Individual Storms.” 2013. Web. 15 Dec 2019.
Vancouver:
Penny SM. Storm Track Variability from the Perspective of Individual Storms. [Internet] [Doctoral dissertation]. University of Washington; 2013. [cited 2019 Dec 15].
Available from: http://hdl.handle.net/1773/23476.
Council of Science Editors:
Penny SM. Storm Track Variability from the Perspective of Individual Storms. [Doctoral Dissertation]. University of Washington; 2013. Available from: http://hdl.handle.net/1773/23476
University of Washington
3.
McCusker, Kelly E.
Investigations of the climate system response to climate engineering in a hierarchy of models.
Degree: PhD, 2013, University of Washington
URL: http://hdl.handle.net/1773/24209
► Global warming due to anthropogenic emissions of greenhouse gases is causing negative impacts on diverse ecological and human systems around the globe, and these impacts…
(more)
▼ Global warming due to anthropogenic emissions of greenhouse gases is causing negative impacts on diverse ecological and human systems around the globe, and these impacts are projected to worsen as climate continues to warm. In the absence of meaningful greenhouse gas emissions reductions, new strategies have been proposed to engineer the climate, with the aim of preventing further warming and avoiding associated climate impacts. We investigate one such strategy here, falling under the umbrella of `solar radiation management', in which sulfate aerosols are injected into the stratosphere. We use a global climate model with a coupled mixed-layer depth ocean and with a fully-coupled ocean general circulation model to simulate the stabilization of climate by balancing increasing carbon dioxide with increasing stratospheric sulfate concentrations. We evaluate whether or not severe climate impacts, such as melting Arctic sea ice, tropical crop failure, or destabilization of the West Antarctic ice sheet, could be avoided. We find that while tropical climate emergencies might be avoided by use of stratospheric aerosol injections, avoiding polar emergencies cannot be guaranteed due to large residual climate changes in those regions, which are in part due to residual atmospheric circulation anomalies. We also find that the inclusion of a fully-coupled ocean is important for determining the regional climate response because of its dynamical feedbacks. The efficacy of stratospheric sulfate aerosol injections, and solar radiation management more generally, depends on its ability to be maintained indefinitely, without interruption from a variety of possible sources, such as technological failure, a breakdown in global cooperation, lack of funding, or negative unintended consequences. We next consider the scenario in which stratospheric sulfate injections are abruptly terminated after a multi- decadal period of implementation while greenhouse gas emissions have continued unabated. We show that upon cessation, an abrupt, spatially broad, and sustained warming over land occurs that is well outside the bounds of 20th century climate variability. We then use an upwelling-diffusion energy balance climate model to further show the sensitivity of these trends to background greenhouse gas emissions, termination year, and climate sensitivity. We find that the rate of warming from cessation of solar radiation management – of critical importance for ecological and human systems – is principally controlled by the background greenhouse gas concentrations. It follows that the only way to avoid the risk of an abrupt and dangerous warming that is inherent to the large-scale implementation of solar radiation management is to also strongly reduce greenhouse gas emissions. The climate system responds to radiative forcing on a diverse spectrum of timescales, which will affect what goals can be achieved for a given stratospheric aerosol implementation. We next investigate how different rates of stratospheric sulfate aerosol deployment affect what…
Advisors/Committee Members: Battisti, David S. (advisor).
Subjects/Keywords: abrupt climate change; climate engineering; climate impacts; geoengineering; solar radiation management; Atmospheric sciences; Climate change; atmospheric sciences
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APA (6th Edition):
McCusker, K. E. (2013). Investigations of the climate system response to climate engineering in a hierarchy of models. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/24209
Chicago Manual of Style (16th Edition):
McCusker, Kelly E. “Investigations of the climate system response to climate engineering in a hierarchy of models.” 2013. Doctoral Dissertation, University of Washington. Accessed December 15, 2019.
http://hdl.handle.net/1773/24209.
MLA Handbook (7th Edition):
McCusker, Kelly E. “Investigations of the climate system response to climate engineering in a hierarchy of models.” 2013. Web. 15 Dec 2019.
Vancouver:
McCusker KE. Investigations of the climate system response to climate engineering in a hierarchy of models. [Internet] [Doctoral dissertation]. University of Washington; 2013. [cited 2019 Dec 15].
Available from: http://hdl.handle.net/1773/24209.
Council of Science Editors:
McCusker KE. Investigations of the climate system response to climate engineering in a hierarchy of models. [Doctoral Dissertation]. University of Washington; 2013. Available from: http://hdl.handle.net/1773/24209
University of Washington
4.
Tetreault-Pinard, Etienne.
Linking Soil Moisture and Summertime Surface Temperature Variability.
Degree: 2014, University of Washington
URL: http://hdl.handle.net/1773/25089
► Summertime temperature variability in the late 20th century simulations of the CMIP3 and CMIP5 climate models used in the IPCC assessments is much greater than…
(more)
▼ Summertime temperature variability in the late 20th century simulations of the CMIP3 and CMIP5 climate models used in the IPCC assessments is much greater than the observed temperature variability – particularly in the continental mid-latitudes. In recent years, interactions between landand atmosphere have been shown through climate model simulations to contribute significantly to temperature variability in summer, mainly via processes involving soil moisture. However, theoretical understanding of the mechanisms linking soil moisture and surface temperature variability is incomplete. In this study, we investigate these links using a simple model of land-atmosphere interactions. We derive a simplified expression for the surface temperature variance by coupling the surface energy and the soil moisture budgets via parameterizations of the dominant processes acting at the land surface interface. We identify two regimes of surface temperature variability, distinguishing whether soil moisture-related processes at the land-surface interface amplify or damp surface temperature variability caused by fluctuations in radiative forcing. These two regimes are distinguished by differences in the processes that determine evapotranspiration which, in turn, are governed by the summertime mean soil moisture content. We found that temperature variability errors in two CMIP3 GCMs are mostly due to an incorrect geographical placement of the boundary separating the two temperature variability regimes in the GCMs and to errors in the variance of the radiation forcing and precipitation forcing. The changes in temperature variability that are projected for the 21st century are consistent with our findings: regions that display the largest increase in temperature variability are those that experience a sufficient reduction of soil moisture to shift the soil-moisture related processes at the land-surface interface from the damped regime to the amplified regime.
Advisors/Committee Members: Battisti, David S. (advisor).
Subjects/Keywords: Climate Change; Climate models; Climate variability; Land-atmosphere interactions; Soil moisture; Atmospheric sciences; atmospheric sciences
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APA (6th Edition):
Tetreault-Pinard, E. (2014). Linking Soil Moisture and Summertime Surface Temperature Variability. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/25089
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tetreault-Pinard, Etienne. “Linking Soil Moisture and Summertime Surface Temperature Variability.” 2014. Thesis, University of Washington. Accessed December 15, 2019.
http://hdl.handle.net/1773/25089.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tetreault-Pinard, Etienne. “Linking Soil Moisture and Summertime Surface Temperature Variability.” 2014. Web. 15 Dec 2019.
Vancouver:
Tetreault-Pinard E. Linking Soil Moisture and Summertime Surface Temperature Variability. [Internet] [Thesis]. University of Washington; 2014. [cited 2019 Dec 15].
Available from: http://hdl.handle.net/1773/25089.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tetreault-Pinard E. Linking Soil Moisture and Summertime Surface Temperature Variability. [Thesis]. University of Washington; 2014. Available from: http://hdl.handle.net/1773/25089
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Washington
5.
Liu, Xiaojuan.
The Influence of Orbital Forcing of Tropical Insolation on the Climate and Isotopic Composition of Precipitation in South America.
Degree: 2015, University of Washington
URL: http://hdl.handle.net/1773/33095
► The δ18O of calcite (δ18Oc) in speleothems from South America is well correlated with austral summer (DJF) insolation, indicating the role of orbitally paced changes…
(more)
▼ The δ
18O of calcite (δ
18O
c) in speleothems from South America is well correlated with austral summer (DJF) insolation, indicating the role of orbitally paced changes in insolation in changing the climate of South America. Using an isotope-enabled atmospheric general circulation model (ECHAM4.6) coupled to a slab ocean model, we study how insolation changes climate and the isotopic composition of precipitation (δ
18O
p) of South America. Compared with times of high summertime insolation, times of low insolation feature (i) a decrease in precipitation inland of tropical South America due to an anomalous cooling of the South American continent and a weakening of the South American summer monsoon, and (ii) an increase in precipitation in eastern Brazil that is associated with the intensification and southward movement of the Atlantic Intertropical Convergence Zone, which in turn is caused by the strengthening of African winter monsoon that is induced by the anomalous cooling of northern Africa. The cooling of Africa also intensifies and shifts the South Atlantic convergence zone northward by generating a Rossby wave to the west of southern Africa. In times of low insolation, δ
18O
p increases in the northern Andes and decreases in northeastern Brazil, consistent with the pattern of δ
18O
c changes seen in speleothems. Further analysis shows that the decrease in δ
18O
p in northeastern Brazil is due to the "amount effect"; while the increase in the northern Andes reflects a change in the seasonality of precipitation and in the isotopic composition of vapor that forms the condensate.
Advisors/Committee Members: Battisti, David S (advisor).
Subjects/Keywords: Climate Change; Isotopic Composition; Orbital Forcing; South America; Atmospheric sciences; Climate change; atmospheric sciences
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APA ·
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Manager
APA (6th Edition):
Liu, X. (2015). The Influence of Orbital Forcing of Tropical Insolation on the Climate and Isotopic Composition of Precipitation in South America. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/33095
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Liu, Xiaojuan. “The Influence of Orbital Forcing of Tropical Insolation on the Climate and Isotopic Composition of Precipitation in South America.” 2015. Thesis, University of Washington. Accessed December 15, 2019.
http://hdl.handle.net/1773/33095.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Liu, Xiaojuan. “The Influence of Orbital Forcing of Tropical Insolation on the Climate and Isotopic Composition of Precipitation in South America.” 2015. Web. 15 Dec 2019.
Vancouver:
Liu X. The Influence of Orbital Forcing of Tropical Insolation on the Climate and Isotopic Composition of Precipitation in South America. [Internet] [Thesis]. University of Washington; 2015. [cited 2019 Dec 15].
Available from: http://hdl.handle.net/1773/33095.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Liu X. The Influence of Orbital Forcing of Tropical Insolation on the Climate and Isotopic Composition of Precipitation in South America. [Thesis]. University of Washington; 2015. Available from: http://hdl.handle.net/1773/33095
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Washington
6.
Vargas Zeppetello, Lucas Randall.
The Origin of Soil Moisture Evaporation "Regimes".
Degree: 2019, University of Washington
URL: http://hdl.handle.net/1773/43627
► Evaporation plays an extremely important role in determining summertime surface temperature and surface temperature variability over land. Observations show the relationship between evaporation and soil…
(more)
▼ Evaporation plays an extremely important role in determining summertime surface temperature and surface temperature variability over land. Observations show the relationship between evaporation and soil moisture generally conforms to the Budyko (1961) We have developed the Simple Land Atmosphere Model (SLAM) as a tool for studying land atmosphere interaction in general, and summertime temperature variability in particular. We use the SLAM to show that a negative feedback between evaporation and surface temperature gives rise to the two apparent evaporation ``regimes" without complex parameterizations. Stemming from vapor pressure deficit'
s temperature dependence, the feedback we identify has important implications for how transitions between wet and dry climates may impact temperature variability as the climate warms. We also elucidate the impacts of surface moisture and insolation perturbations on latent and sensible heat fluxes and on surface temperature variability.
Advisors/Committee Members: Battisti, David S (advisor).
Subjects/Keywords:
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APA (6th Edition):
Vargas Zeppetello, L. R. (2019). The Origin of Soil Moisture Evaporation "Regimes". (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/43627
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vargas Zeppetello, Lucas Randall. “The Origin of Soil Moisture Evaporation "Regimes".” 2019. Thesis, University of Washington. Accessed December 15, 2019.
http://hdl.handle.net/1773/43627.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vargas Zeppetello, Lucas Randall. “The Origin of Soil Moisture Evaporation "Regimes".” 2019. Web. 15 Dec 2019.
Vancouver:
Vargas Zeppetello LR. The Origin of Soil Moisture Evaporation "Regimes". [Internet] [Thesis]. University of Washington; 2019. [cited 2019 Dec 15].
Available from: http://hdl.handle.net/1773/43627.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vargas Zeppetello LR. The Origin of Soil Moisture Evaporation "Regimes". [Thesis]. University of Washington; 2019. Available from: http://hdl.handle.net/1773/43627
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Washington
7.
Maroon, Elizabeth Allison.
The Roles of Land and Orography on Precipitation and Ocean Circulation in Global Climate Models.
Degree: PhD, 2016, University of Washington
URL: http://hdl.handle.net/1773/37022
► In this thesis, coupled and atmosphere-only global climate models are used to examine two large-scale climate asymmetries: the zonal asymmetry of tropical precipitation about the…
(more)
▼ In this thesis, coupled and atmosphere-only global climate models are used to examine two large-scale climate asymmetries: the zonal asymmetry of tropical precipitation about the equator and the preference for sinking in the North Atlantic Ocean, but not in the North Pacific Ocean. The examination of these two climate asymmetries is performed using models of differing complexity. The first half of this dissertation discusses the influence of land on the distribution of tropical precipitation in idealized geometry models. A continent is added to the Northern Hemisphere subtropics of two aquaplanet models; annual mean insolation is prescribed and the albedo and longitudinal extent of the continent are varied. One of the models, GRaM, has gray-radiation physics with moist dynamics, while the other model, GFDL'
s AM2.1, has comprehensive physics. In the GRaM model, the pattern of the precipitation response is mostly related to decreased evaporation due to the now unsaturated surface. As the albedo of land is increased, precipitation shifts southward away from the hemisphere with less absorbed energy. In the AM2.1 model, there is a zonally-varying response in tropical precipitation due to the addition of land, but this response is not rubust in simulations that include a seasonal cycle of insolation. As albedo over land is increased, precipitation shifts southward zonally, just as in GRaM. When the width of the continent is increased, tropical precipitation shifts toward the continent, which indicates that continental width plays an important role in setting the distribution of tropical atmospheric overturning circulations. The second half of this dissertation examines the influence of Rocky Mountain orography on the location of Northern Hemisphere sinking of the oceanic meridional overturning circulation (MOC). Warren (1983) found that there is greater transport of salt into the high latitude North Atlantic than into the North Pacific, allowing water to sink in the winter as the downward branch of the Atlantic MOC (AMOC). The southwest-to-northeast tilt of the boundary between the North Atlantic subtropical and subpolar gyres, which is forced by the winds, accomplishes this northward salt transport. Because the Rocky Mountains influence the distribution of wind stress curl in the midlatitude North Atlantic, the presence of the Rockies may be the reason why water sinks in the North Atlantic (Warren, 1983). To test Warren'
s hypothesis, we remove the Rocky Mountains in a coarse resolution version of GFDL'
s CM2.1 model that has realistic boundary conditions. In this simulation, the removal of the Rockies causes the strength of the AMOC to decrease by 7 Sv and a Pacific MOC (PMOC) starts. Additional coupled simulations are performed that re-route western North American rivers from the North Pacific to the North Atlantic while retaining the Rocky Mountains. In all of the simulations, decreased runoff to the North Pacific is responsible for the increase in salinity that initiates the sinking in the PMOC. A…
Advisors/Committee Members: Battisti, David S. (advisor), Frierson, Dargan M W (advisor).
Subjects/Keywords: climate dynamics; global climate models; intertropical convergence zone; meridional overturning circulation; Atmospheric sciences; Physical oceanography; atmospheric sciences
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APA ·
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Manager
APA (6th Edition):
Maroon, E. A. (2016). The Roles of Land and Orography on Precipitation and Ocean Circulation in Global Climate Models. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/37022
Chicago Manual of Style (16th Edition):
Maroon, Elizabeth Allison. “The Roles of Land and Orography on Precipitation and Ocean Circulation in Global Climate Models.” 2016. Doctoral Dissertation, University of Washington. Accessed December 15, 2019.
http://hdl.handle.net/1773/37022.
MLA Handbook (7th Edition):
Maroon, Elizabeth Allison. “The Roles of Land and Orography on Precipitation and Ocean Circulation in Global Climate Models.” 2016. Web. 15 Dec 2019.
Vancouver:
Maroon EA. The Roles of Land and Orography on Precipitation and Ocean Circulation in Global Climate Models. [Internet] [Doctoral dissertation]. University of Washington; 2016. [cited 2019 Dec 15].
Available from: http://hdl.handle.net/1773/37022.
Council of Science Editors:
Maroon EA. The Roles of Land and Orography on Precipitation and Ocean Circulation in Global Climate Models. [Doctoral Dissertation]. University of Washington; 2016. Available from: http://hdl.handle.net/1773/37022
University of Washington
8.
Dong, Yue.
Attributing Historical and Future Evolution of Radiative Feedbacks to Regional Warming Patterns using a Green's Function Approach: The Preeminence of the Western Pacific.
Degree: 2019, University of Washington
URL: http://hdl.handle.net/1773/44032
► Global radiative feedbacks have been found to vary in global climate model (GCM) simulations. Atmospheric GCMs (AGCMs) driven with historical patterns of sea-surface temperatures (SST)…
(more)
▼ Global radiative feedbacks have been found to vary in global climate model (GCM) simulations. Atmospheric GCMs (AGCMs) driven with historical patterns of sea-surface temperatures (SST) and sea-ice concentrations produce radiative feedbacks that trend toward more negative values, implying low climate sensitivity, over recent decades. Freely-evolving coupled GCMs driven by increasing CO2 produce radiative feedbacks that trend toward more positive values, implying increasing climate sensitivity, in the future. While this time-variation in feedbacks has been linked to evolving SST patterns, the role of particular regions has not been quantified. Here, a Green’
s function is derived from a suite of simulations within an AGCM (NCAR’
s CAM4), allowing an attribution of global feedback changes to surface warming in each region. The results highlight the radiative response to surface warming in ascent regions of the western tropical Pacific as the dominant control on global radiative feedback changes. Historical warming from the 1950s to 2000s preferentially occurred in the western Pacific, yielding a strong global outgoing radiative response at the top of atmosphere (TOA) and thus a strongly negative global feedback. Long-term warming in coupled GCMs occurs preferentially in tropical descent regions and in high latitudes, where surface warming yields small global TOA radiation change but large global surface air temperature change, and thus a less-negative global feedback. These results illuminate the importance of determining mechanisms of warm pool warming for understanding how feedbacks have varied historically and will evolve in the future.
Advisors/Committee Members: Battisti, David S (advisor), Armour, Kyle C (advisor).
Subjects/Keywords: Climate change; Climate sensitivity; Green's function approach; Radiative feedbacks; Sea-surface temperature pattern; Atmospheric sciences; Atmospheric sciences
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APA (6th Edition):
Dong, Y. (2019). Attributing Historical and Future Evolution of Radiative Feedbacks to Regional Warming Patterns using a Green's Function Approach: The Preeminence of the Western Pacific. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/44032
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dong, Yue. “Attributing Historical and Future Evolution of Radiative Feedbacks to Regional Warming Patterns using a Green's Function Approach: The Preeminence of the Western Pacific.” 2019. Thesis, University of Washington. Accessed December 15, 2019.
http://hdl.handle.net/1773/44032.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dong, Yue. “Attributing Historical and Future Evolution of Radiative Feedbacks to Regional Warming Patterns using a Green's Function Approach: The Preeminence of the Western Pacific.” 2019. Web. 15 Dec 2019.
Vancouver:
Dong Y. Attributing Historical and Future Evolution of Radiative Feedbacks to Regional Warming Patterns using a Green's Function Approach: The Preeminence of the Western Pacific. [Internet] [Thesis]. University of Washington; 2019. [cited 2019 Dec 15].
Available from: http://hdl.handle.net/1773/44032.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dong Y. Attributing Historical and Future Evolution of Radiative Feedbacks to Regional Warming Patterns using a Green's Function Approach: The Preeminence of the Western Pacific. [Thesis]. University of Washington; 2019. Available from: http://hdl.handle.net/1773/44032
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
. 
Open Access Theses and Dissertations