Unravelling the mechanism of transient coastal upwelling in the southeastern Arabian Sea triggered by Cyclone Michaung
Cyclone Michaung formed and passed over the Bay of Bengal in early December 2023. In the current study, we investigated the dramatic changes in physical-biogeochemical conditions in the Southeastern Arabian Sea - and the underlying dynamics caused by Cyclone Michaung. Satellite observations indicate...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | Environmental Research Communications |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2515-7620/ada96b |
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| Summary: | Cyclone Michaung formed and passed over the Bay of Bengal in early December 2023. In the current study, we investigated the dramatic changes in physical-biogeochemical conditions in the Southeastern Arabian Sea - and the underlying dynamics caused by Cyclone Michaung. Satellite observations indicated that temperature greatly decreased, but chlorophyll-a concentration increased at the sea surface. In the subsurface layer (5.5 m below the sea surface), an autonomous coastal observatory recorded a dramatic decrease in temperature and dissolved oxygen concentration but increased salinity. Further analyses proved that the physical-biogeochemical changes in the surface and subsurface layers in the Southeastern Arabian Sea were generated by transient coastal upwelling, which was forced by strong winds of Cyclone Michaung via driving offshore Ekman transport. The transient coastal upwelling brought cool and nutrient-rich subsurface waters to the surface and enhanced biological production. Coastal upwelling was unusual in the Southeastern Arabian Sea this season due to the prevalence of downwelling favourable to northeast monsoon winds. This study points out that large-scale weather events could have a prominent role in changing the hydrodynamic and biological features of remote regions due to their strong sea surface winds. |
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| ISSN: | 2515-7620 |