Chlorophyll <i>a</i> concentration response to the typhoon “wind pump” and the Kuroshio in the northeastern South China Sea

Liu Yupeng; Tang Danling; Liang Wenzhao

doi:10.3969/j.issn.0253-4193.2020.07.002

Volume 42 Issue 7

Nov. 2020

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Liu Yupeng，Tang Danling，Liang Wenzhao. Chlorophyll a concentration response to the typhoon “wind pump” and the Kuroshio in the northeastern South China Sea[J]. Haiyang Xuebao，2020, 42(7)：16–31 doi: 10.3969/j.issn.0253-4193.2020.07.002

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Chlorophyll a concentration response to the typhoon “wind pump” and the Kuroshio in the northeastern South China Sea

doi: 10.3969/j.issn.0253-4193.2020.07.002

Liu Yupeng^{1, 2, 3
,},
Tang Danling^{2, 1, 3
,
,},
Liang Wenzhao⁴

1.
State Key Laboratory of Tropical Oceanography/Guangdong Province Key Laboratory of Ocean Remote Sensing, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou), Guangzhou 511458, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Department of Earth Sciences, The University of Hong Kong, Hong Kong 999077, China

Received Date: 2019-05-21
Rev Recd Date: 2019-09-27

Available Online: 2020-11-18

Publish Date: 2020-07-25

Abstract

Abstract

The northeastern South China Sea is oligotrophic. In summer, the northeastern South China Sea is low in phytoplankton chlorophyll a (Chl a) concentration, and the typhoon “wind pump” induced upper ocean turbulence can transport nutrients upwards, and therefore increase the Chl a concentration in the surface and subsurface layers. Previous studies have generally focused on the effects of tropical cyclonic wind stress and ocean mesoscale eddies on the Chl a concentration in the upper ocean. This study investigates the possible effect of the Kuroshio to the Chl a concentration in the euphotic layer after typhoon using CTD data, in situ Chl a concentration, Argo profiles and remote sensing data. The results show that the Typhoon Linfa in 2015 caused a looping path of the Kuroshio intrusion into the South China Sea (Area A) through the northwestern Luzon Strait, which weakened the pre-existing cyclonic eddy after the typhoon. This typhoon “wind pump” enhanced Kuroshio inhibited the uplift of nutrients to the surface layer (0−40 m) through the typhoon Ekman Pumping, and accumulated the nutrient in the subsurface layer (60−90 m), thereby inhibiting the increase of surface Chl a concentration but promoting the growth of subsurface Chl a concentration. The increase of Chl a concentration over the western Luzon in the South China Sea (Area B) was not only the vertical redistribution of the phytoplankton, but especially the growth of the phytoplankton. The typhoon-induced looping path of Kuroshio over the northwestern Luzon promoted the formation of the cyclonic eddy over the western Luzon. This continuously enhancing cyclonic eddy provided sufficient nutrients for the significant increase of the chlorophyll in the surface layer (0−40 m).
- Chl a concentration,
- typhoon “wind pump”,
- Kuroshio,
- northeastern South China Sea,
- ocean remote sensing,
- cyclonic eddy

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References(34)

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