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Proceedings Paper

Evaluation of the harmonic-analysis method for surface soil heat flux estimation: a case study in Heihe River Basin
Author(s): Nana Li; Li Jia; Chaolei Zheng
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Paper Abstract

Surface soil heat flux(G0) is an important component of surface energy balance, and it causes large uncertainty in evapotranspiration estimation. In present study, soil heat flux was calculated at different depths based on the harmonic analysis method (HM) using field data in Heihe River Basin, northwestern China. The soil heat fluxes at a certain depth and at the surface were validated by heat-plate measurements and G0 derived from thermal diffusion equation, respectively. Results showed that HM method obtained good result during the daytime, yet the errors were relatively large at nighttime mostly due to the assumption of symmetry of G0 during daytime and nighttime. Moreover, a regional G0 map was provided based on remote sensing data. This study highlighted the simplicity of HM method and its potential application in large spatial scale mapping. Its internal limit was also discussed here.

Paper Details

Date Published: 8 November 2014
PDF: 13 pages
Proc. SPIE 9260, Land Surface Remote Sensing II, 926043 (8 November 2014); doi: 10.1117/12.2069270
Show Author Affiliations
Nana Li, Institute of Remote Sensing and Digital Earth (China)
Univ. of Chinese Academy of Sciences (China)
Li Jia, Institute of Remote Sensing and Digital Earth (China)
Joint Ctr. for Global Change Studies (China)
Chaolei Zheng, Institute of Remote Sensing and Digital Earth (China)


Published in SPIE Proceedings Vol. 9260:
Land Surface Remote Sensing II
Thomas J. Jackson; Jing Ming Chen; Peng Gong; Shunlin Liang, Editor(s)

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