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Shan Liu, Jingzhi Su, Huijun Wang, Cuijuan Sui. What induced the trend shift of mixed-layer depths in the Antarctic Circumpolar Current region in the mid-1980s?[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2268-5
Citation: Shan Liu, Jingzhi Su, Huijun Wang, Cuijuan Sui. What induced the trend shift of mixed-layer depths in the Antarctic Circumpolar Current region in the mid-1980s?[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2268-5

What induced the trend shift of mixed-layer depths in the Antarctic Circumpolar Current region in the mid-1980s?

doi: 10.1007/s13131-023-2268-5
Funds:  The National Natural Science Foundation of China under contract Nos 41605052.
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  • Corresponding author: E-mail: liu_shan_@126.com
  • Received Date: 2023-06-13
  • Accepted Date: 2023-10-10
  • Available Online: 2023-11-27
  • An obvious trend shift in the annual mean and winter mixed layer depth (MLD) in the Antarctic Circumpolar Current (ACC) region was detected during the 1960–2021 period. Shallowing trends stopped in mid-1980s, followed by a period of weak trends. The MLD deepening trend difference between the two period were mainly distributed in the western areas in the Drake Passage, the areas north to Victoria Land and Wilkes Land, and the central parts of the South Indian sector. The newly formed ocean current shear due to the meridional shift of the ACC flow axis between the two periods is the dominant driver for the MLD trends shift distributed in the western areas in the Drake Passage and the central parts of the South Indian sector. The saltier trends in the regions north to Victoria Land and Wilkes Land could be responsible for the strengthening mixing processes in this region.
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