Aqua 위성 AMSU-A 고도별 온도자료를 이용한 열적 대류권계면고도 산출 및 활용
Retrieval of Thermal Tropopause Height using Temperature Profile Derived from AMSU-A of Aqua Satellite and its Application
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초록
In this study, thermal tropopause height defined from WMO (World MeteorologicalOrganization) using temperature profile derived from Advance Microwave Sounding Unit-A (AMSU-A; hereafter named AMSU) onboard EOS (Earth Observing System) Aqua satelliteis retrieved. The temperature profile of AMSU was validated by comparison with the radiosondedata observed at Osan weather station. The validation in the upper atmosphere from 500to 100 hPa pressure level showed that correlation coefficients were in the range of 0.85~0.97and the bias was less than 1 K with Root Mean Square Error (RMSE) of ~3 K. Thermal tropopauseheight was retrieved by using AMSU temperature profile. The bias and RMSE werefound to be −5~ −37 hPa and 45~67 hPa, respectively. Correlation coefficients were in therange of 0.5 to 0.7. We also analyzed the change of tropopause height and temperature in middletroposphere in the extreme heavy rain event (23 October, 2003) associated with tropopausefolding. As a result, the distinct descent of tropopause height and temperature decrease of ~8 Kat 500 hPa altitude were observed at the hour that maximum precipitation and maximum wind speed occurred. These results were consistent with ERA (ECMWF Reanalysis)-Interim data (potential vorticity, temperature) in time and space.
Abstract
In this study, thermal tropopause height defined from WMO (World MeteorologicalOrganization) using temperature profile derived from Advance Microwave Sounding Unit-A (AMSU-A; hereafter named AMSU) onboard EOS (Earth Observing System) Aqua satelliteis retrieved. The temperature profile of AMSU was validated by comparison with the radiosondedata observed at Osan weather station. The validation in the upper atmosphere from 500to 100 hPa pressure level showed that correlation coefficients were in the range of 0.85~0.97and the bias was less than 1 K with Root Mean Square Error (RMSE) of ~3 K. Thermal tropopauseheight was retrieved by using AMSU temperature profile. The bias and RMSE werefound to be −5~ −37 hPa and 45~67 hPa, respectively. Correlation coefficients were in therange of 0.5 to 0.7. We also analyzed the change of tropopause height and temperature in middletroposphere in the extreme heavy rain event (23 October, 2003) associated with tropopausefolding. As a result, the distinct descent of tropopause height and temperature decrease of ~8 Kat 500 hPa altitude were observed at the hour that maximum precipitation and maximum wind speed occurred. These results were consistent with ERA (ECMWF Reanalysis)-Interim data (potential vorticity, temperature) in time and space.
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