Contributions of physical and biogeochemical processes to phytoplankton biomass enhancement in the surface and subsurface layers during the passage of Typhoon Damrey. Issue 1 (25th January 2017)

• Record Type: Journal Article
• Authors: Pan, Shanshan; Shi, Jie; Gao, Huiwang; Guo, Xinyu; Yao, Xiaohong; Gong, Xiang
• Is Part Of: Journal of geophysical research. Volume 122:Issue 1(2017)
• Page Start: 212
• Page End: 229
• Publication Date: 2017-01-25
• Subjects: physical‐biogeochemical coupled model -- phytoplankton biomass -- primary production -- South China Sea -- typhoon; Geobiology -- Periodicals; Biogeochemistry -- Periodicals; Biotic communities -- Periodicals; Geophysics -- Periodicals; 577.14
• DOI: 10.1002/2016JG003331
• Languages: English
• ISSNs: 2169-8953

Abstract

Abstract: 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 × 10 3 mg C m −2 (~14% of the annual IPP in this region). Key Points: Typhoon Damrey increased the phytoplankton biomass in both the surface and subsurface layers Phytoplankton biomass experienced different changing processes in the two layers Contributions of physical and biogeochemical processes were different in the two layers