Asymmetric chlorophyll responses enhanced by internal waves near the Dongsha Atoll in the South China Sea

Meilin WU; Huijie XUE; Fei CHAI

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Asymmetric chlorophyll responses enhanced by internal waves near the Dongsha Atoll in the South China Sea

Marine ecological environment and its response to marine dynamic processesin the South China Sea | Updated：2024-10-12

- Asymmetric chlorophyll responses enhanced by internal waves near the Dongsha Atoll in the South China Sea
- Journal of Oceanology and Limnology Vol. 41, Issue 2, Pages: 418-426(2023)
- Affiliations：
  
  1.State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
  2.State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
  3.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
  4.Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
- Author bio：
  
  fchai@xmu.edu.cn
- Funds：
- DOI：
  CLC：
- Received：29 December 2021，
  
  Published：01 March 2023
- Accepted：
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WU Meilin,XUE Huijie,CHAI Fei.Asymmetric chlorophyll responses enhanced by internal waves near the Dongsha Atoll in the South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):418-426.
DOI：

WU Meilin,XUE Huijie,CHAI Fei.Asymmetric chlorophyll responses enhanced by internal waves near the Dongsha Atoll in the South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):418-426. DOI：

摘要

Abstract

Internal waves (IWs) are small-scale physical processes that occur frequently in stratified marginal seas. IWs are ubiquitous and well documented in the northern South China Sea (nSCS)

but few studies have explored the ecosystem responses to the IWs. MODISA chlorophyll-

(Chl-

) data from 2002 to 2014 were used to examine the distribution of Chl

near the Dongsha Atoll (DSA). Composite Chl

from about 40 IWs during spring and summer showed stronger response on the northern side than on the southern side of the DSA. One day after the passage of IWs

composite surface Chl

on the northern side increased from 0.11 mg/m

to a maximum mean value of 0.18 mg/m

. It decreased to 0.13 mg/m

after two days and maintained that level for several days after the passage of IWs. The enhanced surface Chl

likely caused subsurface Chl-

maximum and nutrients in the surface layer. Approximately 64% of the increase in surface Chl

was due to the uplift of the subsurface Chl-

maximum one day after the passage of IWs

while nutrient-induced new phytoplankton growth contributed about 18% of the increase a few days later. When the IWs occurred frequently in spring and summer

Chl-

level on the northern side was about 30% higher than that on the southern side. IW dissipation and its impact on nutrients and chlorophyll were stronger on the northern side of the DSA than on the south

which caused a north-south asymmetric distribution of Chl

in the region.

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Keywords

references

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