Volume 41 Issue 9
Aug.  2022
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K M Azam Chowdhury, Wensheng Jiang, Changwei Bian, Guimei Liu, Md Kawser Ahmed, Shaila Akhter. Contributions of shortwave radiation to the formation of temperature inversions in the Bay of Bengal and eastern equatorial Indian Ocean: A modeling approach[J]. Acta Oceanologica Sinica, 2022, 41(9): 19-37. doi: 10.1007/s13131-022-1998-0
Citation: K M Azam Chowdhury, Wensheng Jiang, Changwei Bian, Guimei Liu, Md Kawser Ahmed, Shaila Akhter. Contributions of shortwave radiation to the formation of temperature inversions in the Bay of Bengal and eastern equatorial Indian Ocean: A modeling approach[J]. Acta Oceanologica Sinica, 2022, 41(9): 19-37. doi: 10.1007/s13131-022-1998-0

Contributions of shortwave radiation to the formation of temperature inversions in the Bay of Bengal and eastern equatorial Indian Ocean: A modeling approach

doi: 10.1007/s13131-022-1998-0
Funds:  The Marine Scholarship of China, China Scholarship Council for International Doctoral Students under contract No. 2017SOA016552; the National Natural Science Foundation of China under contract Nos U2106204 and 41676003.
More Information
  • Corresponding author: E-mail: wsjang@ouc.edu.cn
  • Received Date: 2021-08-22
  • Accepted Date: 2021-12-27
  • Available Online: 2022-06-13
  • Publish Date: 2022-08-31
  • 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.
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