HR: 15:00h
AN: A53E-09    [Abstracts]
TI: The Influence of Antarctic Sea-ice Extremes on Large Scale Atmospheric Variability in the Southern Hemisphere
AU: * Raphael, M
EM: raphael@geog.ucla.edu
AF: UCLA, Department of Geography, 1255 Bunche Hall, Los Angeles, CA 90095, United States
AB: The response of the extra-tropical Southern Hemisphere atmosphere to extremes of Antarctic sea ice concentration is investigated using a fully-coupled climate model - the NCAR Community Climate System Model-version 3. Average, maximum, and minimum sea ice concentration climatologies were extracted from satellite-observed sea ice concentrations and used to force the model for three 150-year simulations. Initial results for the atmospheric pressure and temperature fields for the summer season are discussed. The large scale modes of variability such as the Southern Hemisphere Annular Mode are seen to respond to the different sea ice forcings. The way in which the sea ice distribution can initiate these responses and the roles of the atmosphere and ocean in modulating them are discussed.
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
DE: 3319 General circulation (1223)
DE: 3337 Global climate models (1626, 4928)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting