Comparison of satellite-based evapotranspiration models over terrestrial ecosystems in China
文献类型: 外文期刊
第一作者: Chen, Yang
作者: Chen, Yang;Xia, Jiangzhou;Feng, Jinming;Wang, Kaicun;Yuan, Wenping;Chen, Yang;Xia, Jiangzhou;Liang, Shunlin;Li, Xianglan;Wang, Kaicun;Chen, Yang;Xia, Jiangzhou;Liang, Shunlin;Li, Xianglan;Wang, Kaicun;Liang, Shunlin;Feng, Jinming;Ma, Zhuguo;Zhao, Tianbao;Fisher, Joshua B.;Li, Xin;Wen, Jun;Liu, Shuguang;Miyata, Akira;Mu, Qiaozhen;Sun, Liang;Tang, Jianwei;Zhang, Qiang;Xue, Yueju;Yu, Guirui;Zha, Tonggang;Zhang, Li;Zhao, Liang;Yuan, Wenping
作者机构: Beijing Normal Univ, Coll Global Change & Earth Syst Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China;Beijing Normal Univ, State Key Lab Remote Sensing Sci, Beijing 100875, Peoples R China;Beijing Normal Univ, State Key Lab Remote Sensing Sci,
关键词: Eddy covariance;Evapotranspiration;Penman-Monteith;Priestley-Taylor
期刊名称:REMOTE SENSING OF ENVIRONMENT ( 2020影响因子:10.164; 五年影响因子:11.057 )
收录情况: SCI
摘要: Evapotranspiration (ET) is a key component of terrestrial ecosystems because it links the hydrological, energy, and carbon cycles. Several satellite-based ET models have been developed for extrapolating local observations to regional and global scales, but recent studies have shown large model uncertainties in ET simulations. In this study, we compared eight ET models, including five empirical and three process-based models, with the objective of providing a reference for choosing and improving methods. The results showed that the eight models explained between 61 and 80% of the variability in ET at 23 eddy covariance towers in China and adjacent regions. The mean annual ET for all of China varied from 535 to 852mmyr~(-1) among the models. The interannual variability of yearly ET varied significantly between models during 1982-2009 because of different model structures and the dominant environmental factors employed. Our evaluation results showed that the parameters of the empirical methods may have different combination because the environmental factors of ET are not independent. Although the three process-based models showed high model performance across the validation sites, there were substantial differences among them in the temporal and spatial patterns of ET, the dominant environment factors and the energy partitioning schemes. The disagreement among current ET models highlights the need for further improvements and validation, which can be achieved by investigating model structures and examining the ET component estimates and the critical model parameters.
分类号: X83`TP70`P3
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