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Advances in Earth Science  2009, Vol. 24 Issue (7): 705-714    DOI: 10.11867/j.issn.1001-8166.2009.07.0705
The Problems of Surface Energy Balance Closure—An Overview and Case Study
Wang Jiemin1,2, Wang Weizhen1, Liu Shaomin2, Ma Mingguo1, Li Xin1
1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou  730000, China;
2.State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875, China
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 The surface energy balance closure has been one of the major difficulties in the study of surface exchange processes in the last 20 years. Findings from experiments and modeling in recent years have given a much clear understanding of the substantial causes and solving strategies of this issue. Some inabilities of the eddy covariance system in measuring turbulent fluxes, especially in the underestimation of the contribution from larger eddies in difficult conditions such as inhomogeneous surface and complex terrain, are still the essence. After a brief review of recent progress, as a case study, data from two stations of the comprehensive observation in the Heihe River basin (Project WATER) have been analyzed. One of the unique results for station Arou (on highland pasture), for observations from 1~6, August 2008, showed that the surface energy balance could be closed almost perfectly. Surely this is only one case. Major efforts still need to be made for a better understanding of the contribution of turbulence organized structures (TOS), and for a better way to obtain an area averaged fluxes.

Key words:  Surface energy balance      Turbulent fluxes      Eddy-covariance method      Larger scale eddies      WATER     
Received:  11 May 2009      Published:  10 July 2009
Corresponding Authors:  Wang Jiemin     E-mail:
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Wang Jiemin, Wang Weizhen, Liu Shaomin, Ma Mingguo, Li Xin. The Problems of Surface Energy Balance Closure—An Overview and Case Study. Advances in Earth Science, 2009, 24(7): 705-714.

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