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Estimation of evapotranspiration over the terrestrial ecosystems in China

Formally Refereed
Authors: Xianglan Li, Shunlin Liang, Wenping Yuan, Guirui Yu, Xiao Cheng, Yang Chen, Tianbao Zhao, Jinming Feng, Zhuguo Ma, Mingguo Ma, Shaomin Liu, Jiquan Chen, Changliang Shao, Shenggong Li, Xudong Zhang, Zhiqiang Zhang, Ge Sun, Shiping Chen, Takeshi Ohta, Andrej Varlagin, Akira Miyata, Kentaro Takagi, Nobuko Saiqusa, Tomomichi Kato
Year: 2014
Type: Scientific Journal
Station: Southern Research Station
Source: Ecohydrol. 7:139–149


Quantifying regional evapotranspiration (ET) and environmental constraints are particularly important for understanding water and carbon cycles of terrestrial ecosystems. However, a large uncertainty in the regional estimation of ET still remains for the terrestrial ecosystems in China. This study used ET measurements of 34 eddy covariance sites within China and adjacent regions to examine the performance of the revised Remote Sensing-Penman Monteith (RS-PM) model over various ecosystem types including forests, grasslands, wetlands and croplands. No significant systematic error was found in the revised RS-PM model predictions, which explained 61% of the ET variations at all of the validation sites. Regional patterns of ET at a spatial resolution of 1010 km were quantified using a meteorology dataset from 753 meteorological stations, Modern Era Retrospective-analysis for Research and Applications (MERRA) reanalysis products and satellite data such as the Advanced Very High Resolution Radiometer (AVHRR) leaf area index. ET decreased from the southeast of China toward the northwest. Relatively high ET values were found in the southern China such as Yunnan, Hainan, Fujian and Guangdong Provinces, whereas low ET values occurred in northwestern China such as in the Xinjiang autonomous region. On average, the annual ET presented an increasing trend during the 1982-2009,with relatively low ET in 1985, 1993, 1997, 2000 and 2009.We found that the mean annual ET was higher than world average, ranging spatially between 484 and 521mmyr-1, with a mean value of 500mmyr-1, which accounted for approximately 56-83% of the world’s total land-surface ET.


evapotranspiration, Remote Sensing-Penman Monteith model, AVHRR, MERRA, eddy covariance


Li, Xianglan; Liang, Shunlin; Yuan, Wenping; Yu, Guirui; Cheng, Xiao; Chen, Yang; Zhao, Tianbao; Feng, Jinming; Ma, Zhuguo; Ma, Mingguo; Liu, Shaomin; Chen, Jiquan; Shao, Changliang; Li, Shenggong; Zhang, Xudong; Zhang, Zhiqiang; Sun, Ge; Chen, Shiping; Ohta, Takeshi; Varlagin, Andrej; Miyata, Akira; Takagi, Kentaro; Saiqusa, Nobuko; Kato, Tomomichi. 2014. Estimation of evapotranspiration over the terrestrial ecosystems in China. Ecohydrol. 7:139 149.