SATELLITE-OBSERVED RADIATIVE ENERGY BUDGET DURING ONSET PHASE OF SUMMER MONSOON

P.N. Mahajan; G.R. Chinthalu; S. Rajamani

Abstract:

In this paper satellite-derived radiative energy budget such as shortwave radiative heating,longwaveradiative heating and net radiation balance have been studied for the onset phase of summer monsoon1979. Since cloud play an important role in determining diabatic heating field as well as being a reflectionof status of the monsoon itself, the day to day evolution of clouds from TIROS-N satellite has beenmade. Satellite-derived radiative heating rates from surface to 100 hPa were computed for each 100 hPathickness layer. These heating rates were then compared with the observed latitudinal distribution of total radintive heating rates over the domain of the study. From the results of our study it was found thatthe characteristic features such as net radiative heating rates of the order of 0.2℃/day at upper tropospheric level(100-200 hPa)and cooling throughout the lower tropospheric layers with relatively lesscooling between 500-700 hPa layer observed.in a case of satellitexierived radiative energy budget agreewell with the characteristic features of observational radiative energy budget over the domain of thestudy. Therefore, it is suggested that radiative energy budget derived from satellite observati0ns be usedwith great potential and confidence for the evolution of complete life cycle of monsoon over the Indianregion for different years.

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P.N. Mahajan, G.R. Chinthalu, S. Rajamani. SATELLITE-OBSERVED RADIATIVE ENERGY BUDGET DURING ONSET PHASE OF SUMMER MONSOON [J]. Journal of Tropical Meteorology, 1997, 3(2): 215-224.

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SATELLITE-OBSERVED RADIATIVE ENERGY BUDGET DURING ONSET PHASE OF SUMMER MONSOON

Indian Institute of Tropical Meteorology, Pune 411108, India

Received Date: 1997-01-24

Rev Recd Date: 1997-05-09

Abstract: In this paper satellite-derived radiative energy budget such as shortwave radiative heating,longwaveradiative heating and net radiation balance have been studied for the onset phase of summer monsoon1979. Since cloud play an important role in determining diabatic heating field as well as being a reflectionof status of the monsoon itself, the day to day evolution of clouds from TIROS-N satellite has beenmade. Satellite-derived radiative heating rates from surface to 100 hPa were computed for each 100 hPathickness layer. These heating rates were then compared with the observed latitudinal distribution of total radintive heating rates over the domain of the study. From the results of our study it was found thatthe characteristic features such as net radiative heating rates of the order of 0.2℃/day at upper tropospheric level(100-200 hPa)and cooling throughout the lower tropospheric layers with relatively lesscooling between 500-700 hPa layer observed.in a case of satellitexierived radiative energy budget agreewell with the characteristic features of observational radiative energy budget over the domain of thestudy. Therefore, it is suggested that radiative energy budget derived from satellite observati0ns be usedwith great potential and confidence for the evolution of complete life cycle of monsoon over the Indianregion for different years.

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Reference (9)

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SATELLITE-OBSERVED RADIATIVE ENERGY BUDGET DURING ONSET PHASE OF SUMMER MONSOON

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