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Validation of Land Surface Temperature Derived from 37-GHz AMSR-E over Northern China

Validation of Land Surface Temperature Derived from 37-GHz AMSR-E over Northern China
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摘要 A validation study of land surface temperature (LST) obtained from the Ka band (37 GHz) vertically polarized brightness temperature over northern China is presented.The remotely sensed LST derived jointly by the Vrije Universiteit Amsterdam and the NASA Goddard Space Flight Center (VUA-NASA) from the Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E) were compared to the daily in-situ top soil temperature/infrared surface temperature observations from eleven/three Enhanced Coordinated Observation stations in arid and semi-arid regions of northern China.The VUA-NASA LST from the descending path exhibited a stronger correspondence to the in-situ infrared surface temperature than soil temperature observations,whereas correlations (R 2) of the latter ranged from 0.41 to 0.86.Meanwhile,the ascending overpass LST was generally warmer than the in-situ soil temperature observations at all stations,and the correlation (R 2) was between 0.07 and 0.72.Furthermore,the correlation of the descending path was generally greater than that of the ascending path at the same station.The descending path VUA-NASA LST was sensitive to precipitation and presented good agreement with ground temperature dynamics.The analyses demonstrated that the descending overpass LST was reliable to reflect reasonable patterns of temperature dynamics for land surface temperature in the region. A validation study of land surface temperature (LST) obtained from the Ka band (37 GHz) vertically polarized brightness temperature over northern China is presented. The remotely sensed LST derived jointly by the Vrije Universiteit Amsterdam and the NASA Goddard Space Flight Center (VUA-NASA) from the Advanced Microwave Scanning Radiometer-Earth Observing Sys- tem (AMSR-E) were compared to the daily in-situ top soil temperature/infrared surface temperature observations from eleven/three Enhanced Coordinated Observation stations in arid and semi-arid regions of northern China. The VUA-NASA LST from the descending path exhib- ited a stronger correspondence to the in-situ infrared sur- face temperature than soil temperature observations, whereas correlations (R2) of the latter ranged from 0.41 to 0.86. Meanwhile, the ascending overpass LST was gener- ally warmer than the in-situ soil temperature observations at all stations, and the correlation (R2) was between 0.07 and 0.72. Furthermore, the correlation of the descending path was generally greater than that of the ascending path at the same station. The descending path VUA-NASA LST was sensitive to precipitation and presented good agreement with ground temperature dynamics. The analyses demonstrated that the descending overpass LST was reliable to reflect reasonable patterns of temperature dynamics for land surface temperature in the region.
出处 《Atmospheric and Oceanic Science Letters》 2011年第5期257-263,共7页 大气和海洋科学快报(英文版)
基金 supported by the National Basic Research Program of China (Grant No.2009CB723904) the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDA05090201)
关键词 land surface temperature VALIDATION AMSR-E soil temperature northern China 地表温度 中国北方 AMSR GHz 验证 地球观测系统 美国国家航空航天局 外表面温度
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