Variations in incoming shortwave radiation influence the net surface heat flux, contributing to the formation of a temperature inversion. The effects of shortwave radiation on the temperature inversions in the Bay of Bengal and eastern equatorial Indian Ocean have never been investigated. Thus, a high-resolution (horizontal resolution of 0.07°×0.07° with 50 vertical layers) Regional Ocean Modeling System (ROMS) model is utilized to quantify the contributions of shortwave radiation to the temperature inversions in the study domain. Analyses of the mixed layer heat and salt budgets are performed, and different model simulations are compared. The model results suggest that a 30％ change in shortwave radiation can change approximately 3％ of the temperature inversion area in the Bay of Bengal. Low shortwave radiation reduces the net surface heat flux and cools the mixed layer substantially; it also reduces the evaporation rate, causing less evaporative water vapor losses from the ocean than the typical situation, and ultimately enhances haline stratification. Thus, the rudimentary outcome of this research is that a decrease in shortwave radiation produces more temperature inversion in the study region, which is primarily driven by the net surface cooling and supported by the intensive haline stratification. Moreover, low shortwave radiation eventually intensifies the temperature inversion layer by thickening the barrier layer. This study could be an important reference for predicting how the Indian Ocean climate will respond to future changes in shortwave radiation.

K M Azam Chowdhury;Wensheng Jiang;Changwei Bian;Guimei Liu;Md Kawser Ahmed;Shaila Akhter

College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China;Department of Oceanography&International Centre for Ocean Governance(ICOG),University of Dhaka,Dhaka 1000,Bangladesh;National Marine Environmental Forecasting Center,Beijing 100081,China;Key Lab of Marine Environment and Ecology of Ministry of Education,Ocean University of China,Qingdao 266100,China;Frontiers Science Center for Deep Ocean Multispheres and Earth System(FDOMES),Ocean University of China,Qingdao 266100,China;Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;Bangladesh Betar,Ministry of Information and Broadcasting,Government of the People's Republic of Bangladesh,Dhaka 1207,Bangladesh

海洋学报（英文版）

[1]K M Azam Chowdhury;Wensheng Jiang;Changwei Bian;Guimei Liu;Md Kawser Ahmed;Shaila Akhter-.Contributions of shortwave radiation to the formation of tempera-ture inversions in the Bay of Bengal and eastern equatorial Indian Ocean: A modeling approach)[J].海洋学报（英文版）,2022(09):19-37

haline

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