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Possible Mechanism of Phytoplankton Blooms at the Sea Surface after Tropical Cyclones

Chen, Ying, Pan, Gang ORCID: https://orcid.org/0000-0003-0920-3018, Mortimer, Robert ORCID: https://orcid.org/0000-0003-1292-8861 and Zhao, Hui (2022) Possible Mechanism of Phytoplankton Blooms at the Sea Surface after Tropical Cyclones. Remote Sensing, 14 (24). p. 6207.

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Although previous studies have recorded that tropical cyclones cause a significant increase in chlorophyll a concentration (Chl-a), most of these results were only based on surface Chl-a observed by satellite data. Using satellite, reanalysis and model data, this study investigated the response of the upper ocean and sea surface Chl-a to three different levels of tropical cyclones in the South China Sea. In our results, the severe tropical storm (STS) did not cause an increase in surface Chl-a or depth-integrated Chl-a in the short term (i.e., ~2 days); the typhoon (TY) increased the surface Chl-a from 0.12 mg·m−3 to 0.15 mg·m−3 in the short term, but the depth-integrated Chl-a did not increase significantly; the super typhoon (STY) caused the surface Chl-a to increase from 0.15 mg·m−3 to 0.37 mg·m−3 in the short term, and also increased the depth-integrated Chl-a from 40.41 mg·m−2 to 42.59 mg·m−2. These results suggest that the increase in the surface Chl-a after TY and STY were primarily caused by physical processes (e.g., vertical mixing). However, the increase in the depth-integrated Chl-a of STY may be due to the entrainment of both nutrients and phytoplankton through upwelling and turbulent mixing under the influence of STY.

Item Type: Article
Status: Published
DOI: https://doi.org/10.3390/rs14246207
School/Department: Vice Chancellor's Office
URI: https://ray.yorksj.ac.uk/id/eprint/7173

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