Cross-Slope Transport by a Mesoscale Anticyclone in the Northern South China Sea

Cross-slope eddies play an important role in the exchange of water, salt, heat, nutrients, chlorophyll, phytoplankton and other biogeochemical elements between basin and shelf in the South China Sea. The cross-slope transport process by a mesoscale anticyclonic eddy is studied by ROMS model and sate...

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Bibliographic Details
Published in:Journal of marine science and engineering 2023-02, Vol.11 (2), p.305
Main Authors: Lin, Xiayan, Wang, Guixi, Han, Guoqing, Liu, Yu, Zhang, Han, Liao, Xiaomei, Ji, Qiyan
Format: Article
Language:English
Subjects:
Analysis
Anticyclones
Chlorophyll
Chlorophylls
cross-slope
Datasets
Eddies
eddy-induced transport
Ekman pumping
Isobaths
mesoscale eddies
Mesoscale phenomena
Nutrients
Ocean circulation
particle experiment
Phytoplankton
Slope processes
Slope water
South China Sea
Tracers
Transport processes
Volume transport
Vortices
Water transport
Wind
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Summary:Cross-slope eddies play an important role in the exchange of water, salt, heat, nutrients, chlorophyll, phytoplankton and other biogeochemical elements between basin and shelf in the South China Sea. The cross-slope transport process by a mesoscale anticyclonic eddy is studied by ROMS model and satellite data. The 1000 m isobath was considered as a proxy for the slope. The anticyclone shows different features at different places on the slope: (a) the volume transport at the northeast of the slope was off-slope, while at the southwest was on-slope; (b) both on and off-slope transports were greatly enhanced during the cross-slope process, and gradually weakened after crossing the slope. The total cross-slope water transport was 5.97 Sv, which was higher than the along-slope component with −0.58 Sv. The Eulerian results also showed that enhanced cross-slope transport was related to the distance between the eddy and slope, the eddy radius, and the eccentricity of the eddy. The offline passive tracer experiment showed that particles were floating up during and after the crossing process, mainly due to the strong Ekman pumping.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse11020305