Advances in Earth Science ›› 2021, Vol. 36 ›› Issue (8): 773-784. doi: 10.11867/j.issn.1001-8166.2021.054

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Estimation of Land Surface Latent Heat Flux over the Tibetan Plateau Using Geostationary Satellite Data

Lei ZHONG 1, 2, 3( ),Nan GE 1,Yaoming MA 4, 5, 6,Yunfei FU 1,Weiqiang MA 4, 5,Cunbo HAN 4,Xian WANG 1,Meilin CHENG 1   

  1. 1.School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China
    2.CAS Center for Excellence in Comparative Planetology,Hefei 230026,China
    3.Jiangsu Collaborative Innovation Center for Climate Change,Nanjing 210023,China
    4.Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China
    5.CAS Center for Excellence in Tibetan Plateau Earth Sciences,Beijing 100101,China
    6.College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2021-03-17 Revised:2021-05-11 Online:2021-08-10 Published:2021-09-22
  • About author:ZHONG Lei (1979-), male, Bengbu City, Anhui Province, Professor. Research areas include land-atmosphere interactions and satellite remote sensing. E-mail: zhonglei@ustc.edu.cn
  • Supported by:
    the National Natural Science Foundation of China "Remote sensing of surface radiation budgets and heating field under all-sky conditions"(41875031);The Second Tibetan Plateau Scientific Expedition and Research Program "Remote sensing of key land-atmosphere water and energy exchange parameters in westerly monsoon synergy zone"(2019QZKK010305)

Lei ZHONG,Nan GE,Yaoming MA,Yunfei FU,Weiqiang MA,Cunbo HAN,Xian WANG,Meilin CHENG. Estimation of Land Surface Latent Heat Flux over the Tibetan Plateau Using Geostationary Satellite Data[J]. Advances in Earth Science, 2021, 36(8): 773-784.

Variations of land surface latent heat flux with high temporal resolution are essential to the quantitative understanding of the energy and water transfer processes, especially their diurnal cycles over the Tibetan Plateau (TP). Therefore, the Advanced Geostationary Radiation Imager onboard the up-to-date Chinese geostationary meteorological satellite Fengyun-4A was utilized, with the China Meteorological Forcing Dataset in combination, for the estimation of land surface latent heat flux over the entire TP based on the SEBS model. The root mean square error and mean bias for the satellite estimations against the in situ measurements of the Tibetan Observation and Research Platform were 76.05 and 17.33 W/m2, respectively.

Results

showed that land surface latent heat flux over the TP exhibited distinct seasonal variation, day/night discrepancy and regional difference. In April, the plateau-scale latent heat flux was slightly lower than the sensible heat flux overall; while in July, the latent heat flux was higher than the sensible heat flux in all of the western, central, and eastern TP. The daytime, nighttime and daily-mean latent heat flux values in April were 74.22, 3.09, and 38.66 W/m2, while those in July were 122.75, 6.49 and 64.62 W/m2, respectively, depicting a clear diurnal variability. Additionally, the spatial distributions of land surface heat fluxes over the TP presented longitudinal regional differences: both the net radiation flux and sensible heat flux were stronger in the western and central TP, while conversely the latent heat flux was stronger in the eastern TP. The above results may provide information for the quantitative analysis on the surface evapotranspiration and the atmospheric heat source in future studies.

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