Upper Ocean Response Mechanisms to Pre- and Post-Monsoon Cyclones in the Bay of Bengal (IMAGE)

Ocean-Land-Atmosphere Research (OLAR)

Upper Ocean Response Mechanisms to Pre- and Post-Monsoon Cyclones in the Bay of Bengal

Caption

Graphical abstract depicts the contrasting upper-ocean responses to pre-monsoon (red tracks) and post-monsoon (blue tracks) cyclones in the Bay of Bengal. Pre-monsoon cyclones occur over slightly warmer waters (29–31 °C) and are linked to stronger freshwater inflow that lowers coastal salinity. Post-monsoon cyclones develop over slightly cooler waters (28–29 °C) and trigger elevated chlorophyll-a levels (9.9–14.4 mg/m³) along with heavier rainfall from intensified convection. Both cyclone types alter mixed layer depth and drive wind-induced nutrient upwelling through Ekman transport, resulting in distinct seasonal variations in oceanic physical and biological processes.

Credit

Chowdhury, S. U. M. B., Karmakar, A., Hoque, M. E., Hoque, M. M., Tahsin, T. H., & Chowdhury, S. (2025). Upper Ocean Response Mechanisms to Pre-Monsoon and Post-Monsoon Cyclones in the Bay of Bengal. Ocean-Land-Atmosphere Research. https://doi.org/10.34133/olar.0105

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