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Discussion papers
https://doi.org/10.5194/acp-2018-1165
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1165
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 20 Dec 2018

Research article | 20 Dec 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Chemistry and Physics (ACP).

Estimation of Hourly Land Surface Heat Fluxes over the Tibetan Plateau by the Combined Use of Geostationary and Polar Orbiting Satellites

Lei Zhong1, Yaoming Ma2,3,4, Zeyong Hu3,5, Yunfei Fu1, Yuanyuan Hu1, Xian Wang1, Meilin Cheng1, and Nan Ge1 Lei Zhong et al.
  • 1School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
  • 2Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, the Chinese Academy of Sciences, Beijing 100101, China
  • 3CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China
  • 4University of Chinese Academy of Sciences, Beijing 100049, China
  • 5Northwest Institute of Eco-Envrionment and Resources, the Chinese Academy of Sciences, Lanzhou 730000, China

Abstract. The estimation of land surface heat fluxes has significant meaning for energy and water cycle studies, especially for the Tibetan Plateau (TP), which has unique topography and strong land–atmosphere interactions. The land surface heating status also directly influences the movement of atmospheric circulation. However, for a long time, plateau-scale land surface heat flux information with high temporal resolution has been lacking, which greatly limits understanding of diurnal variations in land–atmosphere interactions. Based on geostationary and polar orbiting satellite data, a surface energy balance system (SEBS) was used in this paper to derive hourly land surface heat fluxes with a spatial resolution of 10 km. Six stations scattered through the TP and equipped for flux tower measurements were used to correct the energy imbalance problem existing in the measurements and to perform cross-validation. The results showed good agreement between derived fluxes and in situ measurements through 3738 validation samples. The RMSEs for net radiation flux, sensible heat flux, latent heat flux and soil heat flux were 76.63 W m−2, 60.29 W m−2, 64.65 W m−2 and 37.5 W m−2, respectively. The derived results were also found to be superior to GLDAS flux products (RMSEs for the surface energy balance components were 114.32 W m−2, 67.77 W m−2, 75.6 W m−2 and 40.05 W m−2, respectively). The diurnal and seasonal cycles of land surface energy balance components were clearly identified. Their spatial distribution was found to be consistent with the heterogeneous land surface status and general hydrometeorological conditions of the TP.

Lei Zhong et al.
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Short summary
Fine temporal resolution turbulent heat fluxes at plateau scale have significant importance for studying diurnal variation characteristics of atmospheric boundary and weather systems in the TP and its surroundings. Time series of land surface heat fluxes with high temporal resolution over the entire Tibetan Plateau (TP) were derived. The derived surface heat fluxes were proved to be in good agreement with in situ measurements and superior than GLDAS flux products.
Fine temporal resolution turbulent heat fluxes at plateau scale have significant importance for...
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