Topography-Mediated Transport of Warm Deep Water across the Continental Shelf Slope, East Antarctica

CHENGYAN LIU; ZHAOMIN WANG; XI LIANGXIANG LIXICHEN LICHEN CHENGDI QI

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Topography-Mediated Transport of Warm Deep Water across the Continental Shelf Slope, East Antarctica

机译：Topography-Mediated Transport of Warm Deep Water across the Continental Shelf Slope, East Antarctica

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Warm deep water intrusion over the Antarctic continental shelves threatens the Antarctic ice sheet stability by enhancing the basal melting of ice shelves. In East Antarctica, the Antarctic Slope Current (ASC), along with the Antarctic Slope Front (ASF), acts as a potential vorticity barrier to prevent the warm modified Circumpolar Deep Water (mCDW) from ventilating the cold and fresh shelf. However, mCDW onshore transport is still observed within certain shelf regions, such as submarine troughs running perpendicular to the continental shelf. This study focuses on the dynamic mechanisms governing mCDW intrusion within a submarine trough over the fresh shelf regions, East Antarctica. Based on an idealized eddy-resolving coupled ocean-ice shelf model, two high-resolution process-oriented numerical experiments are conducted to reveal the mechanisms responsible for the mCDW onshore transport. Three dynamic mechanisms governing cross-slope mCDW intrusion are identified: 1) the bottom pressure torque, 2) the topography beta spiral, and 3) the topography Rossby waves. These three mechanisms simultaneously govern the mCDW intrusion together. The bottom pressure torque plays a leading role in driving the time-mean onshore flow whose vertical structure is determined by the topography beta spiral, while the topography Rossby waves contribute to the high-frequency oscillations in the onshore volume and heat transport. The simulated spatial distribution and seasonality of mCDW intrusion qualitatively coincide with the observed mCDW intrusion over fresh shelf regions. East Antarctica. Both the topography beta spiral and the ASC play an important role in governing the seasonality of mCDW intrusion.

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《Journal of physical oceanography》 |2022年第6期|1295-1314|共20页
作者
CHENGYAN LIU; ZHAOMIN WANG; XI LIANGXIANG LIXICHEN LICHEN CHENGDI QI;
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作者单位

Key Laboratory of Marine Hazards Forecasting, National Marine Environmental Forecasting Center, Ministry of Natural Resources, Beijing, China;

Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China;

Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, ChinaPolar and Marine Research Institute, Jimei University, Xiamen, ChinaInternational Polar Environment Research Laboratory, College of Oceanography, Hohai University, Nanjing, China, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China;

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正文语种英语
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Antarctica; Continental shelf/slope; Coastal flows; Topographic effects; Idealized models;

Topography-Mediated Transport of Warm Deep Water across the Continental Shelf Slope, East Antarctica

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