The impact of concurrent variation of atmospheric meridional heat transport in western Baffen Bay and eastern Greenland on summer Arctic sea ice  

作　　者：Le Wang Lujun Zhang Wenfa Yang 

机构地区：[1]Hydrology Bureau,Yangtze River Water Resources Commission,Wuhan 430010,China [2]School of Atmospheric Science,Nanjing University,Nanjing 210023,China

出　　处：《Acta Oceanologica Sinica》2020年第8期14-23,共10页海洋学报（英文版）

基　　金：The National Key Research and Development Program of China under contract Nos 2016YFC0402708,2017YFC1502501,2018YFC1508002 and 2016YFA0602102;the China Special Fund for Meteorological Research in the Public Interest under contract No.GYHY201506011;the National Natural Science Foundation of China under contract Nos 41975134 and 40975040。

摘　　要：Based on the climatological reanalysis data of the European Center for Medium-Range Weather Forecasts and the Arctic sea ice data of the National Snow and Ice Data Center, the relationship between the Arctic sea ice area(SIA)and the interannual variation of atmospheric meridional heat transport(AMHT) was analyzed. The results show that the atmospheric meridional heat transported by transient eddy(TAMHT) dominates the June AMHT in midhigh latitudes of the Northern Hemisphere, while the western Baffin Bay(B) and the eastern Greenland(G) are two gates for TAMHT entering the Arctic. TAMHT in the western Baffin Bay(B-TAMHT) and eastern Greenland(G-TAMHT) has a concurrent variation of reverse phase, which is closely related to the summer Arctic SIA.Possible mechanism is that the three Arctic atmospheric circulation patterns(AD, AO and NAO) in June can cause the concurrent variation of TAMHT in the B and G regions. This concurrent variation helps to maintain AD anomaly in summer through wave action and changes the polar air temperature, thus affecting the summer Arctic SIA. Calling the heat entering the Arctic as warm transport and the heat leaving Arctic as cold transport, then the results are classified into three situations based on B-TAMHT and G-TAMHT: warm B corresponding to cold G(WC), cold B corresponding to warm G(CW), cold B corresponding to cold G(CC), while warm B corresponding to warm G is virtually non-existent. During the WC situation, the SIA in the Pacific Arctic sediments and Kara Sea decreases;during the CW situation, the SIA in the Laptev Sea and Kara Sea decreases;during the CC situation, the SIA in the Kara Sea, Laptev Sea and southern Beaufort Sea increases.

关 键 词：ARCTIC atmospheric meridional heat transport transient eddy sea ice Arctic dipole 

分 类 号：P731.15[天文地球—海洋科学]