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 CSIR Fourth Paradigm Institute

(Formerly CSIR Centre for Mathematical Modelling and Computer Simulation)

A constituent laboratory of Council of Scientific & Industrial Research (CSIR).

Ministry of Science and Technology, Government of India.

Events Calendar

Ph. D. Oral Examination/Viva-voce of Ms. Ipsita Putatunda
Wednesday 09 June 2021, 11:00am - 12:30pm
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Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002, India

CSIR-Fourth Paradigm Institute (CSIR-4PI) NAL Belur Campus, Wind Tunnel Road, Bangalore-560037

PhD Thesis Oral Examination/Viva-Voce

TITLE: Characteristics of Heating and Moisture in Tropics: An Observational Study

By Ipsita Putatunda (AcSIR Enrollment No. 10PP12J45002)

DATE & TIME: 9 TH June 2021, Wednesday at 11:00 AM

VENUE: Google Meet (Join with

ABSTRACT The tropics contribute almost two-thirds of the global precipitation. Precipitating clouds are one of the major components of the global hydrological cycle and the earth’s radiation budget. Tropical deep convective clouds play an important role in tropical dynamics and general circulation by transporting heat and moisture to the upper troposphere. As convection develops and decays it releases condensational latent heating and evaporative cooling in the atmosphere, which significantly modulates atmospheric general circulation, hydrological cycle, climate, and climate variability. It is evident that a large amount of latent heat is liberated in cumulus convection which acts as a tropical heat engine and the released heat is transported upwards, but how this heat is utilized in warming the large-scale environment, is not so obvious. As the vertical structure of heating and moisture is related to the microphysical processes in convective clouds, the pattern of large-scale circulation is highly variable with the vertical structure of heating and drying. Hence, the vertical structure of moisture and latent heat should be critically analyzed to understand the cloud physical processes. Given the large variability of latent heat and moisture in time and space, and noting the importance of their vertical structure, this study aims to analyze the characteristics of latent heating and moisture in tropics using observational data varying with space, time, and altitude. Analysis of TRMM satellite retrieved latent heating data in tropical regions depicts characteristic differences between tropical land and ocean heating profiles. The interannual variability of the vertical heating profile of various tropical regions corresponds well with the major weather events. In the lower troposphere, the major contribution is from positive convective heating whereas positive stratiform heating contributes to the upper troposphere. At the lower troposphere stratiform heating is negative. An objective analysis of long-term satellite observation over land and ocean derives the dominant modes of atmospheric latent heating. Vertical structure of atmospheric moisture in long-term reanalysis data and MeghaTropiques satellite-derived data represent a comparative analysis at multiple time scales at different altitudes. Moisture variation in the diurnal scale with reanalysis and satellite data shows the maximum peak in the early morning, while the minimum occurs during the afternoon. The maximum-minimum moisture contrast is more over land compared to the ocean. Long-term moisture trend in reanalysis data at varying altitudes provides additional information on the vertical moisture distribution in tropics.