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Detailed Reference Information |
Wardle, R. (2003). Using anticyclonicity to determine the position of the Southern Hemisphere westerlies: Implications for the LGM. Geophysical Research Letters 30: doi: 10.1029/2003GL018792. issn: 0094-8276. |
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The possible meridional displacement of southern hemisphere westerlies under a different climate regime is examined by studying the characteristics of surface anticyclones. An atmospheric general circulation model is used to simulate the climates of the present day and the Last Glacial Maximum. A vortex-tracking scheme, applied to the model data, determines the characteristics of southern hemisphere anticyclones. The statistics of anticyclone system density and system strength suggest the glacial epoch had surface westerlies that were displaced poleward over much of the hemisphere during both the summer and winter seasons. The largest displacement occurred in the Australian region during austral winter. The anticyclones also reflect different atmospheric circulations in the past winter climate. These are a weaker tropical circulation and more intense mid-latitude eddy activity. The simulation results are compared to paleo reconstructions and the consequences of potentially important ocean forcing are highlighted. |
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Abstract![](/images/icons/spacer.gif) |
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Keywords
Meteorology and Atmospheric Dynamics, Climatology, Meteorology and Atmospheric Dynamics, General circulation, Meteorology and Atmospheric Dynamics, Paleoclimatology |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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