Some aspects of the energy balance closure problem
Some aspects of the energy balance closure problem
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DOI：
10.5194/acp-6-4395-2006
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发表时间：
2006-09-28
影响因子：
6.3
通讯作者：
Liebethal, C.
中科院分区：
文献类型：
--
作者：
Foken, T.;Wimmer, F.;Liebethal, C.
在简要讨论了表层能量平衡闭合问题的几个原因后，本文重点研究了湍流谱的低频部分对残差的影响。发现这部分湍流谱中湍流通量的变化对残差的变化有显着影响。使用尖峰法，发现在尖峰会聚测量时间长于 30 分钟的典型平均间隔的情况下，涡协方差方法会低估湍流通量。此外，涡协方差方法低估了平均区间内最大拱形函数的湍流通量，这主要是由于平流和非稳态条件造成的。这对涡度协方差法的使用有相当大的影响。
After briefly discussing several reasons for the energy balance closure problem in the surface layer, the paper focuses on the influence of the low frequency part of the turbulence spectrum on the residual. Changes in the turbulent fluxes in this part of the turbulence spectrum were found to have a significant influence on the changes of the residual. Using the ogive method, it was found that the eddy-covariance method underestimates turbulent fluxes in the case of ogives converging for measuring times longer than the typical averaging interval of 30 min. Additionally, the eddy-covariance method underestimates turbulent fluxes for maximal ogive functions within the averaging interval, both mainly due to advection and non-steady state conditions. This has a considerable influence on the use of the eddy-covariance method.