Contributions of physical and biogeochemical processes to phytoplankton biomass enhancement in the surface and subsurface layers during the passage of Typhoon Damrey

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• 作者：Shanshan Pan ; Jie Shi ; Huiwang Gao ; Xinyu Guo ; Xiaohong Yao ; Xiang Gong
• 刊名：Journal of Geophysical Research: Biogeosciences
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：122
• 期：1
• 页码：212-229
• 全文大小：2.6MB
• ISSN：2169-8961

文摘

In this study, a one-dimensional physical-biogeochemical coupled model was established to investigate the responses of the upper ocean to Typhoon Damrey in the basin area of the South China Sea. The surface chlorophyll a concentration (Chl a) increased rapidly from 0.07 to 0.17 mg m⁻³ when the typhoon arrived and then gradually reached a peak of 0.61 mg m⁻³ after the typhoon's passage. The subsurface Chl a decreased from 0.34 to 0.17 mg m⁻³ as the typhoon arrived and then increased gradually to 0.71 mg m⁻³. Analyses of model results indicated that the initial rapid increase in the surface Chl a and the decrease in the subsurface Chl a were caused mainly by physical process (vertical mixing), whereas the subsequent gradual increases in the Chl a in both the surface and subsurface layers were due mainly to biogeochemical processes (net growth of phytoplankton). The gradual increase in the Chl a lasted for longer in the subsurface layer than in the surface layer. Typhoon Damrey yielded an integrated primary production (IPP) of 6.5 × 10³ mg C m⁻² (~14% of the annual IPP in this region).