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Lundi 5 mars - Change and Variability in Antarctic Sea Ice Seasonality (1979-2009), and Its Implications

Par semsou — Dernière modification 22/02/2012 16:15
Quand ? Le 05/03/2012,
de 11:00 à 12:30
Où ? salle Coriolis
Participants Rob Massom (AAD/ACE-CRC, Australia)
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Rob Massom (AAD/ACE-CRC, Australia)

 

Change and Variability in Antarctic Sea Ice Seasonality (1979-2009), and Its Implications

 

Abstract:

 

Although Antarctic sea ice has undergone a small increase in overall extent over the past 30 years, major regional changes have occurred in sea ice coverage in response to changing patterns of large-scale atmospheric circulation. Most notable are opposite-sign changes in sea ice “seasonality” (patterns of annual advance and retreat and resultant coverage duration) in the Bellingshausen-eastern Amundsen Seas and Western Ross Sea sectors (negative and positive respectively). Change in sea-ice seasonality is important because it affects ocean-atmosphere interaction, floating ice-sheet margin exposure to open ocean conditions, and ecosystem structure and function. In addition to examining trends and regional patterns/anomalies (including new East Antarctic results for both pack ice and landfast ice), we evaluate the importance of extreme events and their effects with case-study examples. These show that the biological effects can be both positive and negative, for example. Extreme events tend to be overlooked relative to trend analyses, as do abrupt events such as the Mertz Glacier calving in 2010. This overview concludes with a discussion of key current unknowns (including sea-ice and snowcover thickness distributions), and possible future scenarios.

 
 



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