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Estimation of Land Surface Heat Fluxes over the Tibetan Plateau Using GMS Data

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  • 1 Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto, Japan
  • | 2 International Institute for Geo-Information Science and Earth Observation, Enschede, Netherlands
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Abstract

A Surface Energy Balance System (SEBS) originally developed for the NOAA Advanced Very High Resolution Radiometer was applied to Geostationary Meteorological Satellite (GMS)-5 Visible/Infrared Spin-Scan Radiometer data that were supplemented with other meteorological data. GMS-5, which is a geostationary satellite, recorded continuous hourly information. Surface temperatures obtained from the GMS-5 data were entered into SEBS to estimate the hourly regional distribution of the surface heat fluxes over the Tibetan Plateau. The estimated fluxes are verified by using corresponding field observations. The diurnal cycle of estimated fluxes agreed well with the field measurements. For example, the diurnal range of the estimated sensible heat flux decreases from June to August. This reflects the change of dry to wet surface characteristics resulting from frequent precipitation during the summer monsoon. Over the Tibetan Plateau, the diurnal range of the surface temperature is as large as the annual range, so that the resultant sensible heat flux has a large diurnal variation. Thus, the hourly estimation based on the GMS data may contribute to a better understanding of the land surface–atmosphere interaction in this critical area.

* Current affiliation: Kaijo Sonic Corporation, Tokyo, Japan

Corresponding author address: Yuichiro Oku, Kaijo Sonic Corporation, 19-6, Higashimatsubara, Hakonegasaki, Mizuho-machi, Nishitama-gun, Tokyo 190-1222, Japan. Email: y-oku@sonic.kaijo.co.jp

Abstract

A Surface Energy Balance System (SEBS) originally developed for the NOAA Advanced Very High Resolution Radiometer was applied to Geostationary Meteorological Satellite (GMS)-5 Visible/Infrared Spin-Scan Radiometer data that were supplemented with other meteorological data. GMS-5, which is a geostationary satellite, recorded continuous hourly information. Surface temperatures obtained from the GMS-5 data were entered into SEBS to estimate the hourly regional distribution of the surface heat fluxes over the Tibetan Plateau. The estimated fluxes are verified by using corresponding field observations. The diurnal cycle of estimated fluxes agreed well with the field measurements. For example, the diurnal range of the estimated sensible heat flux decreases from June to August. This reflects the change of dry to wet surface characteristics resulting from frequent precipitation during the summer monsoon. Over the Tibetan Plateau, the diurnal range of the surface temperature is as large as the annual range, so that the resultant sensible heat flux has a large diurnal variation. Thus, the hourly estimation based on the GMS data may contribute to a better understanding of the land surface–atmosphere interaction in this critical area.

* Current affiliation: Kaijo Sonic Corporation, Tokyo, Japan

Corresponding author address: Yuichiro Oku, Kaijo Sonic Corporation, 19-6, Higashimatsubara, Hakonegasaki, Mizuho-machi, Nishitama-gun, Tokyo 190-1222, Japan. Email: y-oku@sonic.kaijo.co.jp

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