Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(borehole geophysical methods). Showing records 1 – 3 of 3 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Colorado

1. Muto, Atsuhiro. Multi-decadal surface temperature trends in East Antarctica inferred from borehole firn temperature measurements and geophysical inverse methods.

Degree: PhD, Geography, 2010, University of Colorado

The climate trend of the Antarctic interior remains unclear relative to the rest of the globe because of a lack of long-term weather records. Recent studies by other authors utilizing sparse available records, satellite data, and models have estimated a significant warming trend in the near-surface air temperature in West Antarctica and weak and poorly constrained warming trend in East Antarctica for the past 50 years. In this dissertation, firn thermal profiling was used to detect multi-decadal surface temperature trends in the interior of East Antarctica where few previous records of any kind exist. The surface temperature inversion from firn temperature profiles provides a climate reconstruction independent of firn chemistry, sparse weather data, satellite data, or ice cores, and therefore may be used in conjunction with these data sources for corroboration of climate trends over the large ice sheets. During the Norwegian-U.S. IPY Scientific Traverse of East Antarctica, in the austral summers of 2007-08 and 2008-09, thermal-profiling telemetry units were installed at five locations. Each unit consists of 16 PRTs (Platinum Resistance Thermometers) distributed in a back-filled borehole of 80 to 90 m deep. The accuracy of the temperature measurement is 0.03 K. Geophysical inverse methods (linearized and Monte Carlo inversion) were applied to one full year of data collected from three units installed near the ice divide in the Dome Fuji/ Pole of Inaccessibility region and one on Recovery Lake B, situated >500 km south to south-west of and >1000 m lower in altitude than sites near the ice divide. Three sites near the ice divide indicate that the mean surface temperatures have increased approximately 1 to 1.5 K within the past ~50 years although the onset and the duration of this warming vary by site. On the other hand, slight cooling to no change was detected at the Recovery Lake B site. Although uncertainties remain due to limitations of the method, these results raise the possibility of an interesting recent climate pattern in East Antarctica; significant warming trend near the ice divide and cooling to no change off the divide. Advisors/Committee Members: Konrad Steffen, Theodore A Scambos, Peter D Blanken.

Subjects/Keywords: Antarctica; borehole temperature; geophysical inverse methods; Climate; Environmental Monitoring; Geology; Geophysics and Seismology

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Muto, A. (2010). Multi-decadal surface temperature trends in East Antarctica inferred from borehole firn temperature measurements and geophysical inverse methods. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/geog_gradetds/11

Chicago Manual of Style (16th Edition):

Muto, Atsuhiro. “Multi-decadal surface temperature trends in East Antarctica inferred from borehole firn temperature measurements and geophysical inverse methods.” 2010. Doctoral Dissertation, University of Colorado. Accessed February 27, 2021. https://scholar.colorado.edu/geog_gradetds/11.

MLA Handbook (7th Edition):

Muto, Atsuhiro. “Multi-decadal surface temperature trends in East Antarctica inferred from borehole firn temperature measurements and geophysical inverse methods.” 2010. Web. 27 Feb 2021.

Vancouver:

Muto A. Multi-decadal surface temperature trends in East Antarctica inferred from borehole firn temperature measurements and geophysical inverse methods. [Internet] [Doctoral dissertation]. University of Colorado; 2010. [cited 2021 Feb 27]. Available from: https://scholar.colorado.edu/geog_gradetds/11.

Council of Science Editors:

Muto A. Multi-decadal surface temperature trends in East Antarctica inferred from borehole firn temperature measurements and geophysical inverse methods. [Doctoral Dissertation]. University of Colorado; 2010. Available from: https://scholar.colorado.edu/geog_gradetds/11


University of Hong Kong

2. Tsang, Wing-shing. Borehole geophysics limitations of natural gamma and gamma-gamma density logging methods.

Degree: 2003, University of Hong Kong

Subjects/Keywords: Prospecting - Geophysical methods.; Geophysical well logging.; Borehole mining.

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Tsang, W. (2003). Borehole geophysics limitations of natural gamma and gamma-gamma density logging methods. (Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/55945

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):

Tsang, Wing-shing. “Borehole geophysics limitations of natural gamma and gamma-gamma density logging methods.” 2003. Thesis, University of Hong Kong. Accessed February 27, 2021. http://hdl.handle.net/10722/55945.

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

MLA Handbook (7th Edition):

Tsang, Wing-shing. “Borehole geophysics limitations of natural gamma and gamma-gamma density logging methods.” 2003. Web. 27 Feb 2021.

Vancouver:

Tsang W. Borehole geophysics limitations of natural gamma and gamma-gamma density logging methods. [Internet] [Thesis]. University of Hong Kong; 2003. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10722/55945.

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

Council of Science Editors:

Tsang W. Borehole geophysics limitations of natural gamma and gamma-gamma density logging methods. [Thesis]. University of Hong Kong; 2003. Available from: http://hdl.handle.net/10722/55945

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

3. Taylor, Kendrick C. Application of borehole geophysical methods to shallow groundwater investigations.

Degree: 1987, University of Nevada – Reno

Borehole geophysical methods have been used extensively for petroleum and mineral exploration; but due to differences in environment and survey objective, modifications of both equipment and interpretation are necessary for shallow groundwater applications. These applications require the use of complementary borehole measurements which can be related to the formation properties by comparison to core samples. Different interpretation strategies must be developed for different environments, strategies for use in unsaturated, saturated with clay present, saturated without clay present, and hydraulically anisotropic environments are developed. Parameters that can be determined are porosity, moisture content, hydraulic conductivity, groundwater velocity, cation exchange content, and pore fluid conductivity. All logging instrumentation measures a property over a short interval of the well. It is important when combining logs to insure that all logs used in the comparison are vertical averages of the same portion with respect to both depth and length of the well. It is also possible to reduce the effect of the vertical averaging by the instrumentation through the use of numerical techniques. A field example is used to demonstrate these methods. The techniques presented make it practical to determine a formation hydraulic properties on a scale of a few tens of centimeters. This high resolution distribution of the formation in turn permits the development of a class of contaminate transport models which utilize the high resolution description of the aquifer variability. These models do not require large scale dependent dispersity terms to match field data because the contaminate movement is realistically described by shear flow in the high resolution advective flow field of the model. A one dimensional model is presented as an example of this class of model. Advisors/Committee Members: Wheatcraft, Stephen (advisor).

Subjects/Keywords: borehole geophysical methods; petroleum exploration; mineral exploration; environment; survey objective; modifications of equipment; modifications of interpretation; shallow groundwater applications; complimentary borehole measurements; formation properties; core; clay; samples; interpretation strategies; unsaturated with clay present; saturated with clay present; saturated without clay present; hydraulically anisotropic environments; porosity; moisture content; hydraulic conductivity; groundwater velocity; cation exchange content; pore fluid conductivity; logging instrumentation measures; wells; logs; vertical averages; depth of wells; length of wells; numerical techniques; formation hydraulic properties; high resolution distribution; contaminate transport models; high resolution description; aquifer variability; dependent diversity; contaminate movement; shear flow; high resolution advective flow field; Mackay Science Project; groundwater  – sampling; groundwater flow; hydraulic measurements; hydrogeology

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Taylor, K. C. (1987). Application of borehole geophysical methods to shallow groundwater investigations. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/1743

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):

Taylor, Kendrick C. “Application of borehole geophysical methods to shallow groundwater investigations.” 1987. Thesis, University of Nevada – Reno. Accessed February 27, 2021. http://hdl.handle.net/11714/1743.

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

MLA Handbook (7th Edition):

Taylor, Kendrick C. “Application of borehole geophysical methods to shallow groundwater investigations.” 1987. Web. 27 Feb 2021.

Vancouver:

Taylor KC. Application of borehole geophysical methods to shallow groundwater investigations. [Internet] [Thesis]. University of Nevada – Reno; 1987. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11714/1743.

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

Council of Science Editors:

Taylor KC. Application of borehole geophysical methods to shallow groundwater investigations. [Thesis]. University of Nevada – Reno; 1987. Available from: http://hdl.handle.net/11714/1743

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

.