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Temporal-spatial Characteristics Analysis of Area-averaged Sensible Heat Fluxes by Large Aperture Scintillometer over Hai River Basin

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  • State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875, China

Received date: 2010-08-03

  Revised date: 2010-09-15

  Online published: 2010-11-10

Abstract

Combined with the measurements of Eddy Covariance (EC) system and Automatic Weather Station (AWS) and  after a series steps including data screening, quality assessment, data processing and gap filling, the sensible heat fluxes of Large Aperture Scintillometer (LAS) HLAS and evapotranspiration (ET)  were  calculated based on the LAS measurements in Miyun, Guantao and Daxing sites over Hai River Basin during 2008-2009. The spatial representation and flux contribution of different land use under unstable conditions  were  analyzed in January and July over Miyun, Guantao and Daxing sites. Combined with the footprint and the crop phenological phase, the seasonal variation of Hlas over the three sites were  compared with Rn in the same period, where Guantao site had  the lowest value each month, Hlas in Miyun and Daxing were closed in January and July. Meanwhile, daily Hlas between 9:00 and 15:00 were  discussed over the three sites from 2008-2009. Compared to the single peak variation of Miyun site,  both  Guantao and Daxing sites both had three peak values because of  the  alternation of crops. Finally, according to the energy closure ratio of EC measurement, the different footprint overlapping ratio between LAS and EC measurements, as well as surface heterogeneity of their non-overlap source area, the difference between Hlas and Hec in Guantao site  was  discussed.

Cite this article

Bai Jie, Liu Shaomin, Ding Xiaoping . Temporal-spatial Characteristics Analysis of Area-averaged Sensible Heat Fluxes by Large Aperture Scintillometer over Hai River Basin[J]. Advances in Earth Science, 2010 , 25(11) : 1187 -1198 . DOI: 10.11867/j.issn.1001-8166.2010.11.1187

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