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Recent autumn sea ice loss in the eastern Arctic enhanced by summer Asian-Pacific Oscillation

Botao Zhou (zhoubt@nuist.edu.cn), Ziyi Song, Zhicong Yin, Xinping Xu, Bo Sun, Pangchi Hsu and Haishan Chen
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Botao Zhou: Nanjing University of Information Science and Technology
Ziyi Song: Nanjing University of Information Science and Technology
Zhicong Yin: Nanjing University of Information Science and Technology
Xinping Xu: Nanjing University of Information Science and Technology
Bo Sun: Nanjing University of Information Science and Technology
Pangchi Hsu: Nanjing University of Information Science and Technology
Haishan Chen: Nanjing University of Information Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Recent rapid Arctic sea ice loss was documented as combined results from anthropogenic forcing and climate system internal variability. However, the role of internal variability is not well understood. Here, we propose that the Asian-Pacific Oscillation (APO), an intrinsic atmospheric mode featuring out-of-phase variations in upper-tropospheric temperatures between Asia and the North Pacific, is one driver for autumn sea ice variability in the eastern Arctic. The positive summer APO favors warming of the mid-latitude North Atlantic sea surface temperatures. This warming persists to autumn and in turn triggers strong anticyclonic anomalies over the Barents-Kara-Laptev Seas and weak lower-tropospheric cyclonic anomalies over the East Siberian Sea, enhancing moisture transport into the eastern Arctic. Such changes consequently increase lower-tropospheric humidity, downwelling longwave radiation, and surface air temperature in the eastern Arctic, thereby melting sea ice. Hence, a recent tendency of the summer APO towards the positive phase accelerates autumn sea ice loss in the eastern Arctic.

Date: 2024
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DOI: 10.1038/s41467-024-47051-8

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