Export pathway of Vincennes Bay Bottom Water and its contribution rate in the Antarctic Bottom Water layer

Cheng Lingqiao; Gao Zhaoquan; Kitade Yujiro; Zhu Guoping

doi:10.12284/hyxb2025019

Volume 47 Issue 3

Mar. 2025

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Cheng Lingqiao，Gao Zhaoquan，Kitade Yujiro, et al. Export pathway of Vincennes Bay Bottom Water and its contribution rate in the Antarctic Bottom Water layer[J]. Haiyang Xuebao，2025, 47(3)：1–12 doi: 10.12284/hyxb2025019

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Export pathway of Vincennes Bay Bottom Water and its contribution rate in the Antarctic Bottom Water layer

doi: 10.12284/hyxb2025019

1.
College of Oceanography and Ecological Science, Shanghai Ocean University, Shanghai 201306, China
2.
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo, 108‒8477, Japan
3.
College of Marine Living Resource Sciences and Management, Shanghai Ocean University, Shanghai 201306, China
4.
Center for Polar Research, Shanghai Ocean University, Shanghai 201306, China

Received Date: 2024-11-23
Rev Recd Date: 2025-01-10

Available Online: 2025-02-11

Publish Date: 2025-03-31

Abstract

Abstract

Based on the hydrographic observations carried out in the austral summer during 2013 and 2015 from the continental shelf to the front regions of Vincennes Bay, East Antarctica, this study utilizes an optimum multiparameter analysis method to evaluate the export pathway of Vincennes Bay Bottom Water (VBBW) and its contribution rate to Antarctic bottom water (AABW). The results show that the freshest, coldest, and most oxygen-rich bottom water is distributed above the northwestern ridge of Vincennes Bay. The highest proportion of local Dense Shelf Water (DSW) on the bottom over this ridge was (28.58 ± 1.75)%, which exceeded the proportion observed at all other stations on the offshore side of the continental slope. The VBBW, a mixture of local DSW and modified Circumpolar Deep Water, was also maximized in the AABW layer on this northwestern ridge. The results suggest that topography plays an important role in guiding the outflow of local DSW and even VBBW, and the northwestern ridge could be the main pathway for VBBW export. In the vertical direction, the proportion of DSW decreases with the shallower depth at most stations, but patchy DSW contribution layers were commonly observed in the sub-bottom layers, which means that the proportion of DSW increases in some depth ranges. According to the anomaly distribution of seawater characteristics on the density surfaces, the DSW in the sub-bottom layers can also be exported along the isopycnals, manifested as thermohaline intrusion patches. These thermohaline intrusion patches have significantly colder, fresher, and oxygen-rich characteristics, which may contribute to the enhancement of sub-bottom ventilation. In addition, VBBW can reach the bottom of the Australia-Antarctic basin at depths deeper than 4000 m but with a limited contribution rate, no more than 17%, and is mainly contributed by mCDW. This study helps understand the export pathway and contribution of bottom water from the medium bay to the bottom layer of the Australia-Antarctic Basin. It provides a reference for further study on the formation and modification of the AABW in this basin.
- Antarctic Bottom Water,
- Vincennes Bay Bottom Water,
- export pathway,
- contribution rate,
- thermohaline intrusion

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References(43)

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