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The Role of Regional Sea Surface Temperatures on the Amundsen-Bellingshausen Seas Low as Depicted by Atmospheric Model Intercomparison Project Simulations

Wovrosh, Alex J.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1406817246

Abstract Details

2014, Master of Science (MS), Ohio University, Geography (Arts and Sciences).
Multiple Community Atmospheric Model version 4 (CAM4) simulations, in conjunction with European Centre Hamburg Model version 5 (ECHAM5) and European Centre for Medium-Range Weather Forecasts Interim reanalysis data, are utilized in order to study the Amundsen-Bellingshausen Seas Low (ABSL) from a diagnostic perspective. The underlying goal is to ascertain which forcing mechanisms (e.g., regional sea ice cover, global vs. tropical sea surface temperatures, or radiative forcing), are statistically influential upon the ABSL variations and by extension, regional Antarctic climate. This was accomplished through multiple statistical techniques, such as composite and regression analysis. Results of this work indicate that both CAM4 and ECHAM5 simulations perform relatively well in depicting the seasonal variability of the ABSL (and thus are acceptable for use within this study). It is then shown that different forcing mechanisms affect the ABSL in a non-uniform fashion throughout the year (i.e., dependent upon season). While radiative forcing is necessary to identify many circulation changes with time, this is not true of mean conditions of ABSL or the El Niño-Southern Oscillation teleconnection, where global sea surface temperatures and/ or regional sea ice variations are more influential. Further, while tropical sea surface temperatures are sufficient in producing circulation patterns resembling the Pacific South American Pattern, this tropical forcing alone cannot produce extratropical temperature anomalies. Rather, radiative forcing (and in some cases global sea surface temperatures/ regional sea ice), must also be considered within the model framework to generate more realistic magnitude and spatial extent for these temperature anomalies near the surface.
Ryan Fogt, Dr. (Advisor)
Dorothy Sack, Dr. (Committee Member)
Gaurav Sinha, Dr. (Committee Member)
165 p.
Atmosphere; Atmospheric Sciences; Climate Change; Meteorology
ABSL; AMIP; West Antarctica; Climate

Recommended Citations

Citations

  • Wovrosh, A. J. (2014). The Role of Regional Sea Surface Temperatures on the Amundsen-Bellingshausen Seas Low as Depicted by Atmospheric Model Intercomparison Project Simulations [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1406817246

    APA Style (7th edition)

  • Wovrosh, Alex. The Role of Regional Sea Surface Temperatures on the Amundsen-Bellingshausen Seas Low as Depicted by Atmospheric Model Intercomparison Project Simulations. 2014. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1406817246.

    MLA Style (8th edition)

  • Wovrosh, Alex. "The Role of Regional Sea Surface Temperatures on the Amundsen-Bellingshausen Seas Low as Depicted by Atmospheric Model Intercomparison Project Simulations." Master's thesis, Ohio University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1406817246

    Chicago Manual of Style (17th edition)

ohiou1406817246
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This open access ETD is published by Ohio University and OhioLINK.