HR: 1340h
AN: A13E-1597    [Abstracts]
TI: Arctic Cyclone Activity: Synoptic-scale Modeling Study and Upscaling Implication for Large- scale Climate Variability and Change
AU: * Zhang, J
EM: jing@gi.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775, United States
AU: Krieger, J
EM: jeremy@gi.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775, United States
AU: Zhang, X
EM: xdz@iarc.uaf.edu
AF: International Arctic Research Center, University of Alaska Fairbanks, 930 Koyukuk Dr., Fairbanks, AK 99775, United States
AB: Observational study indicates that synoptic-scale cyclone activity has intensified in recent decades in the Arctic region, concurrently with a large-scale reduction of the mean sea level pressure, an amplification of the Arctic/North Atlantic Oscillation, and a decrease of sea ice extent. This intensification can be attributed to the more enormous and more intense cyclones both generated locally and traveling into the Arctic from mid-latitudes. The latter is manifested by a poleward shift of storm tracks. Not only do the intensified cyclones may bring high frequency weather extremes, but also they may result in an enhancement of atmosphere-sea ice-ocean interactions and, in turn, leave fingerprints on large-scale climate variability and change. In this paper, we will first introduce an Arctic regional coupled model with atmosphere-sea ice-ocean interactions taken into account. Then, we will show a model simulation result of a cyclone process over the Bering Sea and the Beaufort Sea area during the deployment period of the Surface Heat Budget of the Arctic Ocean (SHEBA) field experiment. The simulation results will be validated by the SHEBA measurements. The thermodynamic feedback between atmosphere, sea ice and ocean in the cyclone process will be presented. Finally, the upscaling implication of synoptic-scale cyclone activity for large-scale Arctic climate variability and change will be discussed.
DE: 0750 Sea ice (4540)
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
DE: 3329 Mesoscale meteorology
DE: 3349 Polar meteorology
DE: 4504 Air/sea interactions (0312, 3339)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting