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Retrieval of Upper Tropospheric Relative Humidity by the GMS-5 Water Vapor Channel: A Study of the Technique


doi: 10.1007/BF02915680

  • This paper presents an analysis of a technique for retrieving upper tropospheric relative humidity through the GMS-5 satellite's 6.7-micron water vapor channel brightness temperature.NCEP analysis shows that a critical assumption of the retrieval theory,namely the constant temperature lapse rate,matches only in the tropical atmosphere.By statistical analyses of brightness temperature simulated by a radiative transfer model and of relative humidity,we examine the effect of lapse rate on this retrieval method and obtain retrieval parameters and error estimates applicable to the GMS-5 satellite over East Asia.If the retrieval parameters are properly chosen,the relative error of retrieving the upper tropospheric relative humidity in this region is less than 10%,and if applied to the low-latitude summer atmosphere,it is less than 5%.
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Manuscript History

Manuscript received: 10 January 2004
Manuscript revised: 10 January 2004
通讯作者: 陈斌, bchen63@163.com
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Retrieval of Upper Tropospheric Relative Humidity by the GMS-5 Water Vapor Channel: A Study of the Technique

  • 1. Department of Atmospheric Sciences,Peking University,Beijing 100871,Department of Atmospheric Sciences,Peking University,Beijing 100871,Department of Atmospheric Sciences,Peking University,Beijing 100871

Abstract: This paper presents an analysis of a technique for retrieving upper tropospheric relative humidity through the GMS-5 satellite's 6.7-micron water vapor channel brightness temperature.NCEP analysis shows that a critical assumption of the retrieval theory,namely the constant temperature lapse rate,matches only in the tropical atmosphere.By statistical analyses of brightness temperature simulated by a radiative transfer model and of relative humidity,we examine the effect of lapse rate on this retrieval method and obtain retrieval parameters and error estimates applicable to the GMS-5 satellite over East Asia.If the retrieval parameters are properly chosen,the relative error of retrieving the upper tropospheric relative humidity in this region is less than 10%,and if applied to the low-latitude summer atmosphere,it is less than 5%.

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