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Recent Trends in Land Surface Temperature on the Tibetan Plateau

Yuichiro OkuDisaster Prevention Research Institute, Kyoto University, Uji, Kyoto, Japan

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Hirohiko IshikawaDisaster Prevention Research Institute, Kyoto University, Uji, Kyoto, Japan

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Shigenori HaginoyaPhysical Meteorology Research Department, Meteorology Research Institute, Tsukuba, Ibaraki, Japan

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Yaoming MaInstitute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China

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Abstract

The diurnal, seasonal, and interannual variations in land surface temperature (LST) on the Tibetan Plateau from 1996 to 2002 are analyzed using the hourly LST dataset obtained by Japanese Geostationary Meteorological Satellite 5 (GMS-5) observations. Comparing LST retrieved from GMS-5 with independent precipitation amount data demonstrates the consistent and complementary relationship between them. The results indicate an increase in the LST over this period. The daily minimum has risen faster than the daily maximum, resulting in a narrowing of the diurnal range of LST. This is in agreement with the observed trends in both global and plateau near-surface air temperature. Since the near-surface air temperature is mainly controlled by LST, this result ensures a warming trend in near-surface air temperature.

Corresponding author address: Yuichiro Oku, Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan. Email: okusan@storm.dpri.kyoto-u.ac.jp

Abstract

The diurnal, seasonal, and interannual variations in land surface temperature (LST) on the Tibetan Plateau from 1996 to 2002 are analyzed using the hourly LST dataset obtained by Japanese Geostationary Meteorological Satellite 5 (GMS-5) observations. Comparing LST retrieved from GMS-5 with independent precipitation amount data demonstrates the consistent and complementary relationship between them. The results indicate an increase in the LST over this period. The daily minimum has risen faster than the daily maximum, resulting in a narrowing of the diurnal range of LST. This is in agreement with the observed trends in both global and plateau near-surface air temperature. Since the near-surface air temperature is mainly controlled by LST, this result ensures a warming trend in near-surface air temperature.

Corresponding author address: Yuichiro Oku, Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan. Email: okusan@storm.dpri.kyoto-u.ac.jp

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