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Estimation of Land Surface Temperature over the Tibetan Plateau using Geostationary Meteorological Satellite "Himawari"

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Other Title
  • 気象衛星ひまわりを用いたチベット高原上の地表面温度の算出

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GMS/VISSR images have been used to estimate the land surface temperature distribution over the TibetanPlateau. The infrared split-window algorithm is used with some modifications to obtain surface temperaturesfrom NOAA/AVHRR measurements. Radiative transfer simulations are carried out to obtain the atmospherictransmittances and the difference temperatures that are involved in the internal coefficients of the split-windowalgorithm. Precipitable water distribution that is required by this algorithm is estimated from 6.7 m brightnesstemperature utilizing spectral characteristics of GMS water vapor channel.Cloud removal has an important part to play in surface temperature retrieval process. To identify convectivecloud activity, many researchers use satellite infrared measurements with the fixed threshold technique. But inthis study, it is necessary to remove not only convective clouds but also all kind of clouds. For this purpose, thevariable threshold technique is proposed. The threshold varies dependently on both seasonal and diurnal, and itsvalue is determined on the basis of surface observation. As a result of adoption this technique, it becomes possibleto remove relatively warmer clouds in summer and detect colder ground surface in winter nighttime.The results of comparing estimated surface temperature from GMS data using this algorithm with in-situ surfacemeasurements shows high correlation coefficient, it is nearly 0.8 or over.



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  • CRID
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  • HDL
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  • Article Type
    departmental bulletin paper
  • Data Source
    • IRDB
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