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 Arctic Ocean-Atmosphere Interactions at the Decadal and Longer Time Scales 
  
 M. Ikeda and MIG 
  
 It has been known that the Polar Vortex has decadal variabilities, 
 called Arctic Oscillation. Analyses of sea ice cover and cloud cover 
 tell us that they have trends such as ice decay and cloud increase in 
 addition to the decadal variabilities. The effect of clouds on air-sea 
 heat flux is comparable with the positive ice-albedo feedback due to 
 the ice decay. It is stressed that we should look at parameters more 
 than sea ice cover in doubled CO2 experiments. A coupled ice-ocean 
 model has been developed and is driven by variable Polar Vortex. The 
 model successfully reproduces the sea ice variability: i.e., 
 responding to the stronger Polar Vortex, sea ice decreases in the 
 Siberian Shelves but increases on Canadian side. Using marine 
 geochemistry data collected by ex-Soviet scientists, we try to relate 
 the decadal variability with the atmospheric variability. The 
 geochemistry field variability is consistent with Ekman pumping 
 induced by Polar Vortex. These results will be useful for 
 reconstructing the Arctic atmosphere-ice-ocean field at a climate 
 variability scale. 
  

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$B@PEO(B $B@5 $BBg5$3$MN7w4D6-2J3X@l96(B $BJ*M}7O(B
mail-to:momoko@ees.hokudai.ac.jp / Tel: 011-706-2359