Plateau Meteorology

Plateau Meteorology >

2016 , Vol. 35 >Issue 2: 375 - 384

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00158

Land Surface Evapotranspiration Estimated based on MODIS Remote Sensing Products over the Semi-Arid Northwest China

  • WANG Lijuan ,
  • GUO Ni ,
  • YANG Qidong ,
  • WANG Jiemin ,
  • SHA Sha ,
  • HU Die
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  • Gansu Key Laboratory of Arid Climatic Change and Reducing Disater/Key Laboratory of Arid Climatic Change and Disaster Reduction of China Meteorological Administration/Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;2. Department of Atmospheric Sciences, Yunnan University, Kunming 650091, China;3. Cold and Arid Regions Environmental and Engineering Research Institute, China Academy of Sciences, Lanzhou 730000, China

Received date: 2014-05-27

  Online published: 2016-04-28

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Abstract

Based on the Moderate-Resolution Imaging Spectroradiometer (MODIS) products, the air temperature in the net radiation and evaportranspiration models were instead by the land surface temperature, and the models were modified using the observed data of Semi-Arid Climate and Environment Observatory of Lanzhou University(SACOL). Then the net radiation and evapotranspiration estimated by original and modified models were compared with the observed values in SACOL and Dingxi Arid Meteorology and Ecological Environment Experimental Station (Dingxi station). The results showed that:the MODIS daytime/nighttime land surface temperature was highly correlated with the observed daily maximum\minimum air temperature, and the correlation coefficients were greater than 0.75, therefore the air temperature in the model can be instead by land surface temperature, and using this method all the parameters in the model have specific physical meanings. Compared to the observations, the modified model improved the accuracy of net radiation and evapotranspiration when used the observed data to modify the model. The root mean square errors of the net radiation by modified models reduced to 25.93 W·m-2. The evapotranspiration of SACOL and Dingxi stations estimated by the modified model was closer to the measured data, and the root mean square errors were reduced to 0.81 mm and 0.68 mm, respectively, and the correlation coefficients were greater than 0.6, and all passed the 0.01 level of significance test. Furthermore, the modified model estimated regional evapotranspiration distributions were consistent with the actual land covers of the research area, which implied that the net radiation and evapotranspiration estimated by the modified model was reasonable. Because the modified model only used the remote sensing data without any real-time ground observation, it was a new idea to study the radiation and evapotranspiration in the area where lack of ground measured data.

Key words： Net radiation; Evapotranspiration; MODIS; Land surface tempera

Cite this article

WANG Lijuan , GUO Ni , YANG Qidong , WANG Jiemin , SHA Sha , HU Die . Land Surface Evapotranspiration Estimated based on MODIS Remote Sensing Products over the Semi-Arid Northwest China[J]. Plateau Meteorology, 2016 , 35(2) : 375 -384 . DOI: 10.7522/j.issn.1000-0534.2014.00158

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