| 天气与气候 |
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| Estimation of Summer Land Surface Temperature over Desert and Oasis Area in Middle Reaches of Heihe River Using ASTER Data |
| TIAN Hui1, WEN Jun1, MA Yao-ming2, HU Ze-yong1, ZHANG Tang-tang1, LIU Rong1, HU Xiao1 |
| 1.Laboratory for Climate Environment and Disasters of Western China, Lanzhou 730000, China; 2.Institute of Tibet Plateau, Chinese Academy of Sciences, Beijing 730000, China |
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Abstract In this paper, a study on land surface temperature(LST) and land surface emissivity estimation over the desert and oasis area in Heihe river basin in the summer of 2003 is conducted by using Advanced Spaceborne Thermal Emission Reflectance Radiometer(ASTER) data, based on Temperature/Emissivity Separation method(TES), Alpha Derived Emissivity method(ADE) and Emissivity Parameterization method from vegetation coverage (Pv). The analysis suggests that the estimations of the three methods are relatively close and their retrieval results are consistent with the ground observations. According to the retrieved results, the water body surface temperature mainly ranges from 19.0℃ to 21.0℃ and the cropland surface temperature mainly ranges from 27.0℃ to 29.0℃, and the desert and Gobi surface temperatures range from 40.0℃ to 60.0℃. It is found that the Pv parameterization method provides lower LST over oasis region and the ADE method provides higher LST, whereas the result is inverse over desert and Gobi region. In these two cases, the result provided by the TES method is between the one estimated by the Pv parameterization method and the ADE method. It is also found that LST appears relatively high spatial variation both over the oasis and the desert regions. A fitted formula based on emissivity spectra library is established in order to get the broad channel LSE. Using this formula, a maximal 8.0 W·m-2 error was caused in calculating long-wave radiation at a large environmental LST range.
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Received: 15 May 2007
Published: 20 May 2008
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2008, Vol. 28 
