The impact of concurrent variation of atmospheric meridional heat transport in western Baffen Bay and eastern Greenland
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The impact of concurrent variation of atmospheric meridional heat transport in western Baffen Bay and eastern Greenland on summer Arctic sea ice Le Wang1, Lujun Zhang2*, Wenfa Yang1 1 Hydrology Bureau, Yangtze River Water Resources Commission, Wuhan 430010, China 2 School of Atmospheric Science, Nanjing University, Nanjing 210023, China
Received 1 February 2020; accepted 5 March 2020 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract
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. Key words: Arctic, atmospheric meridional heat transport, transient eddy, sea ice, Arctic dipole Citation: Wang Le, Zhang Lujun, Yang Wenfa. 2020. The impact of concurrent variation of atmospheric meridional heat transport in western Baffen Bay and eastern Greenland on summer Arctic sea ice. Acta Oceanologica Sinica, 39(8): 14–23, doi: 10.1007/s13131-020-1614-0
1 Introduction The most visible change in the Arctic region in recent decades has been the rapid decline of the sea ice cover (Comiso et al., 2008; Comiso, 2012). As the most important cold source in the northern hemisphere, Arctic sea ice change has an important influence on the climate of the Arctic and even the Northern Hemisphere (Walsh, 2014; Overland et al., 2016; Liu et al., 2016), and the most important linkage between sea ice and climate is the atmospheric circulation (Deser and
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