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The Geography Speakers Series presents, Marilyn Raphael, Professor, UCLA and Vice President (and President-elect) of the AAG, Antarctic Sea Ice Variability, Change and Linkages with the Atmospheric Circulation

Marilyn Raphael 040822
April 8, 2022
3:30PM - 5:00PM
Via Zoom

Date Range
Add to Calendar 2022-04-08 15:30:00 2022-04-08 17:00:00 The Geography Speakers Series presents, Marilyn Raphael, Professor, UCLA and Vice President (and President-elect) of the AAG, Antarctic Sea Ice Variability, Change and Linkages with the Atmospheric Circulation The Geography Speaker Series presents, Marilyn Raphael, Professor, UCLA and Vice President (and President-elect) of the AAG, Antarctic Sea Ice Variability, Change and Linkages with the Atmospheric Circulation Antarctic Sea ice is a critically important component of our Climate system.  It is at once habitat for penguins, a moderator of the largescale atmospheric circulation and an influence on the global thermohaline circulation. While similar in many respects to Arctic sea ice, there are distinct differences. Antarctic sea ice variability is strongly regional - five distinct regions of variability have been defined. While exhibiting similar annual cycles, these regions vary in their times of advance and retreat as well as in overall sea ice extent. They also have different spectral signatures with interannual frequencies of varying strengths. Antarctic sea ice trends are also strongly regional with positive trends occurring, for example, in the Ross Sea and negative trends in the Bellingshausen-Amundsen Seas. Some of the intrinsic spatial variability in the sea ice is probably due to the effect of the geography of Antarctica and the influence of the ocean. Some is due to the influence of the largescale atmospheric circulation – the Southern Hemisphere Annular Mode, Zonal Wave Three and the Amundsen Sea Low.  In this presentation I discuss how these components of the atmospheric circulation exert their influence on different regions of sea ice and how the sea ice might be expected to change as the atmospheric circulation changes. I also discuss the role that these atmospheric circulation mechanisms played in initiating and supporting the recent extremes in Antarctic sea ice.  Zoom Registration: https://osu.zoom.us/meeting/register/tJIpcuuopjkpE9wP29dJ94vK09obrtID_EGJ Via Zoom Department of Geography geog_webmaster@osu.edu America/New_York public

The Geography Speaker Series presents, Marilyn Raphael, Professor, UCLA and Vice President (and President-elect) of the AAG,

Antarctic Sea Ice Variability, Change and Linkages with the Atmospheric Circulation

Antarctic Sea ice is a critically important component of our Climate system.  It is at once habitat for penguins, a moderator of the largescale atmospheric circulation and an influence on the global thermohaline circulation. While similar in many respects to Arctic sea ice, there are distinct differences. Antarctic sea ice variability is strongly regional - five distinct regions of variability have been defined. While exhibiting similar annual cycles, these regions vary in their times of advance and retreat as well as in overall sea ice extent. They also have different spectral signatures with interannual frequencies of varying strengths. Antarctic sea ice trends are also strongly regional with positive trends occurring, for example, in the Ross Sea and negative trends in the Bellingshausen-Amundsen Seas. Some of the intrinsic spatial variability in the sea ice is probably due to the effect of the geography of Antarctica and the influence of the ocean. Some is due to the influence of the largescale atmospheric circulation – the Southern Hemisphere Annular Mode, Zonal Wave Three and the Amundsen Sea Low.  In this presentation I discuss how these components of the atmospheric circulation exert their influence on different regions of sea ice and how the sea ice might be expected to change as the atmospheric circulation changes. I also discuss the role that these atmospheric circulation mechanisms played in initiating and supporting the recent extremes in Antarctic sea ice. 

Zoom Registration: https://osu.zoom.us/meeting/register/tJIpcuuopjkpE9wP29dJ94vK09obrtID_EGJ

Marilyn Raphael 040822