Differences in the association of sea surface temperature—precipitating systems over the Bay of Bengal and the Arabian Sea during southwest monsoon season

Saikranthi, K and Radhakrishna, B and Thota, NR and Satheesh, SK (2019) Differences in the association of sea surface temperature—precipitating systems over the Bay of Bengal and the Arabian Sea during southwest monsoon season. In: International Journal of Climatology, 39 (11). pp. 4305-4312.

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Abstract

The intriguing, but complex, association among sea surface temperature (SST) and different types of precipitating systems (deep and shallow) over the Bay of Bengal and the Arabian Sea has been elucidated utilizing 16 years of tropical rainfall measuring mission (TRMM) data. The characteristics and their convective forcing of these two seas are fundamentally different due to differences in SST. At a given SST, the occurrence of deeper (shallow) systems is higher (lower) over the Bay of Bengal than in the Arabian Sea. The occurrence of deeper systems increases with SST over both the seas till 30°C and decreases from 30 to 31°C. On the other hand, the occurrence of shallow systems is independent of SST over the Bay of Bengal while it decreases with rise in SST over the Arabian Sea. The prevalence of weaker convective available potential energy and drier mid-troposphere over the Arabian Sea than over the Bay of Bengal is detrimental for cloud growth and is responsible for lower occurrence of deep systems and higher occurrence of shallow systems. The differences in mid-tropospheric dynamics and moisture between the Arabian Sea and the Bay of the Bengal play a major role in the occurrence of deep and shallow systems. © 2019 Royal Meteorological Society

Item Type:	Journal Article
Publication:	International Journal of Climatology
Publisher:	John Wiley and Sons Ltd
Additional Information:	The copyright for this article belongs to John Wiley and Sons Ltd
Keywords:	Atmospheric temperature; Atmospheric thermodynamics; Electromagnetic wave backscattering; Potential energy; Rain; Rain gages; Submarine geophysics; Surface properties; Surface waters; Troposphere, Arabian sea; Bay of Bengal; Sea surface temperature (SST); Southwest monsoon; Tropical rainfall measuring mission precipitation radars, Oceanography, atmospheric forcing; atmospheric moisture; monsoon; precipitation (climatology); radar; sea surface temperature; TRMM; troposphere, Arabian Sea; Bay of Bengal; Indian Ocean
Department/Centre:	Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited:	07 Jan 2023 05:41
Last Modified:	07 Jan 2023 05:41
URI:	https://eprints.iisc.ac.in/id/eprint/78855

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