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Modified Circumpolar Deep Water inflow to the Dotson-Getz Trough in the summers of 2020 and 2022

Advances in Polar Science 2023年第2期34卷 80-90页

作者： XIE Chunhu SHI Jiuxin SUN Yongming JIANG Jindong guy dwilliams SHUAI Hongtao LIN Lijin XIAO Changhao CAO Yong WANG Kun Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China Center for Ocean and Climate Research First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China

The melting of the West Antarctic Ice Shelf has increased since the 1990s,driven by the relatively warm Circumpolar Deep Water(CDW)that penetrates into the West Antarctic Ice Shelf cavities through submarine glacial troughs across the continental *** this study,temperature,salinity,and current velocity data obtained by the Chinese National Antarctic Research Expedition in the Dotson-Getz Trough(DGT)shows clear differences in distribution of modified Circumpolar Deep Water(mCDW)in the summers of 2020 and *** with contemporaneous wind data and additional temperature and salinity data from instrumented seals,the processes and mechanisms responsible for this variation are *** with 2020,there is a significant increase in mCDW thickness in 2022,with a doubling of total heat content as the mCDW inflow path across the DGT shifts towards the eastern *** propose that a southward shift in the westerly winds in the summer of 2022 moved the upper oceanic divergence zone southward towards the continental slope,promoting the upwelling of mCDW above 500 ***,stronger westerly winds over the continental slope strengthened the eastward undercurrent,increasing the transport of this mCDW and its associated heat content to the DGT through Ekman *** observations show there is strong interannual variability in the strength,path and extent of mCDW inflows to the DGT and that care must be taken when planning observation programs for long-term monitoring of the oceanic heat input to the ice shelves of this globally significant region.

关键词： modified Circumpolar Deep Water wind Dotson-Getz Trough Amundsen Sea Antarctica

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