Ocean and Polar Research

  • 제31권4호
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  • Pages.297-304
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  • 2009
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  • 1598-141X(pISSN)
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  • 2234-7313(eISSN)
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)
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Westerly Winds in the Southern Ocean During the Last Glacial Maximum Simulated in CCM3

  • 발행 : 2009.12.30
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초록

We investigated the response of the westerly winds over the Southern Ocean (SO) to glacial boundary conditions for the Last Glacial Maximum using the CCM3 atmospheric general circulation model. In response to glacial boundary conditions, the zonally averaged maximum SO westerly winds weakened 20-35% and were displaced toward the equator by 3-4 degrees. This weakening of the SO westerly winds arose from a substantial increase in mean sea level pressure (MSLP) in the southern part of the SO around Antarctica relative to the northern part. The increase in MSLP around Antarctica is associated with a marked temperature reduction caused by an increase in sea ice cover and ice albedo feedback during the glacial time. The weakened westerly winds in the SO and their equator-ward displacement might play a role in reducing the atmospheric $CO_2$ concentration by reducing upwelling of the carbon rich deep water during the glacial time.

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피인용 문헌

  1. Toward understanding the dust deposition in Antarctica during the Last Glacial Maximum: Sensitivity studies on plausible causes vol.115, pp.D24, 2010, https://doi.org/10.1029/2010JD014791
  2. Sensitivity of southern hemisphere westerly wind to boundary conditions for the last glacial maximum 2017, https://doi.org/10.1016/j.quaint.2017.04.001
  3. The Southern Annular Mode (SAM) in PMIP2 simulations of the last glacial maximum vol.31, pp.4, 2014, https://doi.org/10.1007/s00376-013-3179-8