Distribution and the internal hydrographic characteristics of eddies in the Scotia Sea, Antarctica

Yan Chenbing; Cheng Lingqiao; Zhu Guoping

doi:10.12284/hyxb2022023

Volume 44 Issue 3

Mar. 2022

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Yan Chenbing，Cheng Lingqiao，Zhu Guoping. Distribution and the internal hydrographic characteristics of eddies in the Scotia Sea, Antarctica[J]. Haiyang Xuebao，2022, 44(3)：1–14 doi: 10.12284/hyxb2022023

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Distribution and the internal hydrographic characteristics of eddies in the Scotia Sea, Antarctica

doi: 10.12284/hyxb2022023

Yan Chenbing^1
,,
Cheng Lingqiao^{1, 2, 3
,
,},
Zhu Guoping^{1, 2, 4, 5}

1.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
2.
Center for Polar Research, Shanghai Ocean University, Shanghai 201306, China
3.
Demonstration Center for Experimental Teaching of Marine Science and Technology, Shanghai Ocean University, Shanghai 201306, China
4.
Polar Marine Ecosystem Laboratory, Ministry of Education Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Shanghai Ocean University, Shanghai 201306, China
5.
National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China

Received Date: 2021-03-18
Rev Recd Date: 2021-06-02
Publish Date: 2022-03-18

Abstract

Abstract

Eddies in the Southern Ocean play a critical role in transporting material and heat across fronts. Scotia Sea is located downstream of the Drake Passage and is an important economic fishery area, hence study on the distribution and role of eddies in this region is of urgent importance. Based on satellite remote sensing data from 2005 to 2019, the characteristics of eddies are statistically calculated, including radius, propagation distance, and lifespan. Their spatial distribution, cross-front movement, and movement characteristics are also analyzed. Meanwhile, the internal hydrographic characteristics of eddies are analyzed based on profile data. Results show that about 92% of eddies have a lifespan shorter than 30 d, with an average radius between 10 km and 30 km. The generating location of eddies are mainly near Polar Front (PF), Southern ACC Front (SACCF), and Sub-antarctic Front (SAF), corresponding to the bottom depth ranging 3 000 m to 5 000 m. Large values of eddy kinetic energy (EKE) concentrate between PF and SAF due to the obstruction of the submarine ridges, and EKE reaches a significant positive anomaly after 2016. The number of equator-ward eddies is dominant in the eddies across PF and SACCF, with most being cyclonic eddies. Anticyclonic eddies are dominant in poleward eddies. The internal hydrographic structures of eddies show that temperature and salinity are relatively low in the subsurface layer of the cold eddies, consistent with the characteristics of water masses at high latitudes. While they are relatively high in the subsurface layer of the warm eddies. It suggests that cold eddies may carry water from high latitudes to low latitudes and warm eddies may carry seawater from low latitudes to high latitudes. This study provides a basis for further understanding of the characteristics of eddies in the Scotia Sea and their effects on the distribution of biological populations and material and energy transport.
- Scotia Sea,
- ocean eddy,
- characteristic statistics,
- cross-frontal transport,
- vertical structure

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References(45)

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