Footprint-weighted tile approach for a spruce forest and a nearby patchy clearing using the ACASA model
Footprint-weighted tile approach for a spruce forest and a nearby patchy clearing using the ACASA model
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使用 ACASA 模型对云杉林和附近的片状空地进行足迹加权平铺方法
DOI：
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
T. Foken
中科院分区：
文献类型：
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作者：
Kathrin Gatzsche;W. Babel;E. Falge;R. Pyles;U. KyawThaPaw;A. Raabe;T. Foken
抽象的。ACASA（高级冠层-大气-土壤算法）模型，
一个更高阶的封闭高大的植被，已经被
成功测试并验证了均质云杉
森林本文的目的是测试模型使用
一个占地面积加权瓷砖的方法，为清除与
底层表面的异质结构。比较
与通量数据显示了良好的协议与足迹聚集
模型的方法。然而，比较的结果
以平均土地利用率为基础，
清算的分类没有显著不同。是
假设足迹模型不够精确，
小规模的异质性。所有测量的通量通过以下公式进行校正：
强制测试数据的能量平衡闭合，
保持测量的鲍文比或通过归因于
剩余取决于感热通量和潜热通量的份额
到浮力通量。与模型的比较，
能量平衡是封闭的，表明浮力修正，
Bowen比>1.5更好地拟合测量数据。对于下鲍文
比率，校正可能介于两种方法之间，但
现有数据太少，无法得出结论。与
假设水和二氧化碳通量之间的相似性，
对Bowen来说，不需要对净生态系统交换进行校正
比率>1.5。
Abstract. The ACASA (Advanced Canopy–Atmosphere–Soil Algorithm) model, with
a higher-order closure for tall vegetation, has already been
successfully tested and validated for homogeneous spruce
forests. The aim of this paper is to test the model using
a footprint-weighted tile approach for a clearing with
a heterogeneous structure of the underlying surface. The comparison
with flux data shows a good agreement with a footprint-aggregated
tile approach of the model. However, the results of a comparison
with a tile approach on the basis of the mean land use
classification of the clearing is not significantly different. It is
assumed that the footprint model is not accurate enough to separate
small-scale heterogeneities. All measured fluxes are corrected by
forcing the energy balance closure of the test data either by
maintaining the measured Bowen ratio or by the attribution of the
residual depending on the fractions of sensible and latent heat flux
to the buoyancy flux. The comparison with the model, in which the
energy balance is closed, shows that the buoyancy correction for
Bowen ratios >1.5 better fits the measured data. For lower Bowen
ratios, the correction probably lies between the two methods, but the
amount of available data was too small to make a conclusion. With an
assumption of similarity between water and carbon dioxide fluxes,
no correction of the net ecosystem exchange is necessary for Bowen
ratios >1.5 .
影响因子：
4.9
作者：
Babel, W.;Biermann, T.;Foken, T.
通讯作者：
Foken, T.