Estimation of the Land Surface Emissivity in the Hinterland of Taklimakan Desert  

作　　者：LIU Yong-qiang Ali MAMTIMIN HUO Wen YANG Xing-hua LIU Xin-chun MENG Xian-yong HE Qing 

机构地区：[1]College of Resource & Environmental Sciences, Xinjiang University [2]Key Laboratory of Oasis Ecology (Ministry of Education) [3]Key Laboratory of City Intellectualizing and Environment Modeling, Xinjiang University [4]Institute of Desert Meteorology,China Meteorological Administration [5]Desert Atmosphere & Environment Observation Experiment Station of Taklimakan

出　　处：《Journal of Mountain Science》2014年第6期1543-1551,共9页山地科学学报（英文）

基　　金：sponsored by the National Natural Science Foundation of China (Grant No. 41265002, 41130641, and 41175140);the Special Fund for Meteorology-scientific Research in the Public Interest of China (Grant No. GYHY201306066)

摘　　要：An accurate accounting of land surface emissivity(ε) is important both for the retrieval of surface temperatures and the calculation of the longwave surface energy budgets.Since ε is one of the important parameterizations in land surface models(LSMs),accurate accounting also improves the accuracy of surface temperatures and sensible heat fluxes simulated by LSMs.In order to obtain an accurate emissivity,this paper focuses on estimating ε from data collected in the hinterland of Taklimakan Desert by two different methods.In the first method,ε was derived from the surface broadband emissivity in the 8–14 μm thermal infrared atmospheric window,which was determined from spectral radiances observed by field measurements using a portable Fourier transform infrared spectrometer,the mean ε being 0.9051.The second method compared the observed and calculated heat fluxes under nearneutral atmospheric stability and estimated ε indirectly by minimizing the root-mean-square difference between them.The result of the second method found a mean value of 0.9042,which is consistent with the result by the first method.Although the two methods recover ε from different field experiments and data,the difference of meanvalues is 0.0009.The first method is superior to the indirect method,and is also more convenient.

关 键 词：Taklimakan Desert Land surface emissivity Thermal infrared spectra Surface temperature Heat flux 

分 类 号：P422.1[天文地球—大气科学及气象学]