Sources of local dense shelf water near the Cape Darnley fast ice in Prydz Bay, Antarctica

Han Wantong; Xia Ruibin; Luo Yiyong; Shi Jiuxin; Li Bingrui

doi:10.12284/hyxb2023116

Volume 45 Issue 9

Sep. 2023

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Han Wantong，Xia Ruibin，Luo Yiyong, et al. Sources of local dense shelf water near the Cape Darnley fast ice in Prydz Bay, Antarctica[J]. Haiyang Xuebao，2023, 45(9)：45–57 doi: 10.12284/hyxb2023116

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Sources of local dense shelf water near the Cape Darnley fast ice in Prydz Bay, Antarctica

doi: 10.12284/hyxb2023116

Han Wantong^{1, 2
,},
Xia Ruibin^{2, 3
,
,},
Luo Yiyong^{1
,
,},
Shi Jiuxin¹,
Li Bingrui³

1.
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
2.
School of Marine Science, Nanjing University of Information Science & Technology, Nanjing 210044, China
3.
Key Laboratory of Polar Science, Ministry of Natural Resources, Polar Research Institute of China , Shanghai 200136, China

Received Date: 2022-12-02
Rev Recd Date: 2023-04-20

Available Online: 2023-08-22

Publish Date: 2023-09-30

Abstract

Abstract

In this paper, we analyze the variation of local dense shelf water around the Cape Darnley fast ice by using a landfast ice dataset and in-situ observation data of Antarctic elephant seals. The results show that: firstly, there are significant seasonal variations of Cape Darnley fast ice, which has a vital impact on the formation of the Cape Darnley polynya and the local dense shelf water. Secondly, the interannual variation of Cape Darnley fast ice is minimal from 2000 to 2014, with no significant trend of increasing or decreasing. Thirdly, we identify two significant sources of local dense shelf water near the Cape Darnley fast ice area: (1) dense shelf water produced by the strong brine rejection process during the rapid generation of Cape Darnley fast ice from March to April; (2) Cape Darnley fast ice reaching its maximum extent and local brine rejection being reduced to a minimum in May. After the weakening of the inhibition of ice shelf water, the formation of dense shelf water in the upstream MacKenzie Bay polynya is enhanced and transported northwest to the vicinity of the Cape Darnley fast ice. In this study, we preliminarily demonstrates that, in addition to maintaining Cape Darnley polynya, Cape Darnley fast ice probably has an important influence on the generation of local dense shelf water, and points out an important water mass transport path. These would help improve the comprehension of ice-sea interaction near Cape Darnley and point out the need for more observations or modeling studies in this area.
- fast ice,
- dense shelf water,
- Cape Darnley,
- Antarctic

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References(43)

References

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