Thinner Sea Ice Contribution to the Remarkable Polynya Formation North of Greenland in August 2018 |
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| Authors: | Xiaoyi SHEN Chang-Qing KE Bin CHENG Wentao XIA Mengmeng LI Xuening YU Haili LI |
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| Institution: | School of Geography and Ocean Science,Nanjing University,Nanjing 210023,China;Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology,Nanjing University,Nanjing 210023,China;Collaborative Innovation Center of South China Sea Studies,Nanjing University,Nanjing 210023,China;School of Geography and Ocean Science,Nanjing University,Nanjing 210023,China;Collaborative Innovation Center of Novel Software Technology and Industrialization,Nanjing 210023,China;Finnish Meteorological Institute,Helsinki 00101,Finland |
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| Abstract: | In August 2018, a remarkable polynya was observed off the north coast of Greenland, a perennial ice zone where thick sea ice cover persists. In order to investigate the formation process of this polynya, satellite observations, a coupled iceocean model, ocean profiling data, and atmosphere reanalysis data were applied. We found that the thinnest sea ice cover in August since 1978(mean value of 1.1 m, compared to the average value of 2.8 m during 1978-2017) and the modest southerly wind caused by a positive North Atlantic Oscillation(mean value of 0.82, compared to the climatological value of-0.02) were responsible for the formation and maintenance of this polynya. The opening mechanism of this polynya differs from the one formed in February 2018 in the same area caused by persistent anomalously high wind. Sea ice drift patterns have become more responsive to the atmospheric forcing due to thinning of sea ice cover in this region. |
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| Keywords: | polynya sea ice thickness wind sea ice drift Greenland |
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