期刊
AGRICULTURAL AND FOREST METEOROLOGY
卷 226, 期 -, 页码 37-49出版社
ELSEVIER
DOI: 10.1016/j.agrformet.2016.05.012
关键词
Eddy covariance; Footprint; Slope; Grassland
资金
- Austrian National Science Fund (FWF) [P26425]
- Autonomous Province of Bolzano/Bozen-South Tyrol (Division for the Promotion of Education, Universities and Research)
- Austrian Science Fund (FWF) [P 26425] Funding Source: researchfish
- Austrian Science Fund (FWF) [P26425] Funding Source: Austrian Science Fund (FWF)
In complex, sloping terrain, horizontal measurements of net radiation are not reflective of the radiative energy available for the conductive and convective heat exchange of the underlying surface. Using data from a grassland site on a mountain slope characterised by spatial heterogeneity in inclination and aspect, we tested the hypothesis that a correction of the horizontal net radiation measurements which accounts for the individual footprint contributions of the various surfaces to the measured sensible and latent heat eddy covariance fluxes will yield more realistic slope-parallel net radiation estimates compared to a correction based on the average inclination and aspect of the footprint. Our main result is that both approaches led to clear, but very similar improvements in the phase between available energy and the sum of the latent and sensible heat fluxes. As a consequence the variance in the sum of latent and sensible heat flux explained by available radiation improved by > 10%, while energy balance closure improved only slightly. This is shown to be mainly due to the average inclination and aspect corresponding largely with the inclination and aspect of the main flux source area in combination with a limited sensitivity of the slope correction to small angular differences in, particularly, inclination and aspect. We conclude with a discussion of limitations of the present approach and future research directions. (C) 2016 The Authors. Published by Elsevier B.V.
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