首页|Distribution of modified Circumpolar Deep Water and its threat in Vincennes Bay,East Antarctica

Distribution of modified Circumpolar Deep Water and its threat in Vincennes Bay,East Antarctica

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The Antarctic Bottom Water formation site Vincennes Bay,East Antarctica is experiencing a substantial intrusion of modified Circumpolar Deep Water(mCDW),which may inhibit the formation of Dense Shelf Water(DSW)and drive basal melting of the ice shelves.Based on hydrographic data obtained from March to November in 2012,we evaluated the spatial spread of mCDW over the continental shelf region of Vincennes Bay and the associated temporal evolution of water properties,as well as the sea ice formation effect on water column in the coastal polynya.Results show that two branches of mCDW occupied the deep layers of the continental shelf,distinguished by the potential density(smaller than 27.8 kg/m3 or not)when potential temperature θ=-0.5 ℃ in the θ-salinity space.The warmer and less dense branch observed on the east plateau,accessed the eastern ice shelves in the coastal polynya to drive basal melting of ice shelves.In contrast,the other colder and denser branch in the mid-depression reached the western Underwood Ice Shelf.DSW formation was detectable in the coastal polynya during September-November,proving the occurrence of deep convection.Surface heat loss and brine rejection during the intensive sea ice formation contributed to the destratification of the water column in the coastal polynya.It was estimated that at least 1.11±0.79 TW heat carried by mCDW into the inner part of the polynya.

modified circumpolar deep waterevolution of water propertiescoastal polynyaice shelfVincennes Bay

Wenjun YE、Lingqiao CHENG、Yujiro KITADE、Song HU、Juncheng ZUO

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College of Oceanography and Ecological Science,Shanghai Ocean University,Shanghai 201306,China

Key Laboratory of Marine Ecological Monitoring and Restoration Technologies,Ministry of Natural Resources,Shanghai 201306,China

Department of Ocean Sciences,Tokyo University of Marine Science and Technology,Tokyo 108-8477,Japan

National Natural Science Foundation of ChinaInternational Science and Technology Cooperation Key Special Project of the National Key Research and Development Program of

421304022023YFE0104500

2024

10.1007/s00343-024-3164-3

海洋湖沼学报(英文版)
中国海洋湖沼学会

海洋湖沼学报(英文版)

CSTPCD
影响因子：0.386
ISSN：2096-5508
年,卷(期)：2024.42(5)