On the energy balance closure and net radiation in complex terrain.
On the energy balance closure and net radiation in complex terrain.
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DOI：
10.1016/j.agrformet.2016.05.012
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发表时间：
2016-10-15
影响因子：
6.2
通讯作者：
Peng, Zhao
中科院分区：
文献类型：
--
作者：
Georg, Wohlfahrt;Albin, Hammerle;Georg, Niedrist;Katharina, Scholz;Enrico, Tomelleri;Peng, Zhao
在复杂的倾斜地形中，净辐射的水平测量值不能反映下垫面传导和对流热交换可用的辐射能量。利用坡度和坡向具有空间异质性的山坡草地数据，我们检验了这样一个假设，即考虑到各个表面对测得的感热和潜热涡动协方差通量的单独足迹贡献的水平净辐射测量值的校正将产生更真实的斜率，平行净辐射估计值与基于足迹平均倾角和纵横比的校正值进行比较。我们的主要结果是，这两种方法导致了明确的，但非常相似的可用能量和潜热和感热通量的总和之间的相位的改善。因此，可用辐射解释的潜热通量和感热通量之和的方差改善了> 10%，而能量平衡闭合仅略有改善。这被示出主要是由于平均倾斜度和方面主要对应于倾斜度和方面的主要通量源区域结合有限的灵敏度的斜率校正，特别是倾斜度和方面的小角度差异。最后，我们讨论了本方法的局限性和未来的研究方向。
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.
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