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

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

doi:10.1007/s00343-024-3164-3

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

Physics | Updated：2024-11-19

- Distribution of modified Circumpolar Deep Water and its threat in Vincennes Bay, East Antarctica
- Journal of Oceanology and Limnology Vol. 42, Issue 5, Pages: 1399-1414(2024)
- Affiliations：
  
  1.College of Oceanography and Ecological Science, Shanghai Ocean University, Shanghai201306, China
  2.Key Laboratory of Marine Ecological Monitoring and Restoration Technologies, Ministry of Natural Resources, Shanghai201306, China
  3.Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo108-8477, Japan
- Author bio：
  
  lqcheng@shou.edu.cn
- Funds：
- DOI：10.1007/s00343-024-3164-3
  CLC：
- Received：28 August 2023，
  
  Online First：28 December 2023，
  
  Published：01 September 2024
- Accepted：
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YE Wenjun,CHENG Lingqiao,KITADE Yujiro,et al.Distribution of modified Circumpolar Deep Water and its threat in Vincennes Bay, East Antarctica[J].Journal of Oceanology and Limnology,2024,42(05):1399-1414.
DOI：

YE Wenjun,CHENG Lingqiao,KITADE Yujiro,et al.Distribution of modified Circumpolar Deep Water and its threat in Vincennes Bay, East Antarctica[J].Journal of Oceanology and Limnology,2024,42(05):1399-1414. DOI： 10.1007/s00343-024-3164-3.

摘要

Abstract

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/m

or not) when potential temperature

=0.5 °‍‍C in the

-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.

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references

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