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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Estimating Turbulent Heat Fluxes With a Weak-Constraint Data Assimilation Scheme: A Case Study (HiWATER-MUSOEXE)
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Estimating Turbulent Heat Fluxes With a Weak-Constraint Data Assimilation Scheme: A Case Study (HiWATER-MUSOEXE)

机译：用弱约束数据同化方案估算湍流通量：一个案例研究（HiWATER-MUSOEXE）

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摘要

A weak-constraint variational data assimilation (WC-VDA) scheme was developed to estimate turbulent heat fluxes by assimilating sequences of land surface temperature measurements. In contrast to the commonly used strong-constraint VDA system, the WC-VDA approach accounts for the effects of structural and model errors and generates better results. This is achieved by adding a model error term ( $omega$) to the surface energy balance equation. The WC-VDA model was tested at two sites with very distinct hydrological and vegetated conditions: the Daman site (a wet site located in an oasis area and covered by seeded corn) and the Huazhaizi site (a dry site located in a desert area and covered by sparse grass). The two sites represent typical desert–oasis landscapes in the middle reaches of the Heihe River Basin, northwestern China. The results proved that the WC-VDA method performed well over very dry and wet conditions, and the estimated sensible and latent heat fluxes agree well with eddy covariance measurements.
机译：开发了一种弱约束变异数据同化（WC-VDA）方案，以通过同化地面温度测量序列来估算湍流通量。与常用的强约束VDA系统相比，WC-VDA方法可解决结构和模型误差的影响并产生更好的结果。这是通过在表面能平衡方程中添加模型误差项（ $ omega $ ）来实现的。 WC-VDA模型在水文条件和植被条件截然不同的两个地点进行了测试：Daman地点（位于绿洲地区的湿地，被播种的玉米覆盖）和Huazhaizi地点（位于沙漠地区的干旱地带）。被稀疏的草覆盖）。这两个地点代表了中国西北黑河流域中游的典型沙漠绿洲景观。结果证明，WC-VDA方法在非常干燥和潮湿的条件下都表现良好，并且估计的感热通量和潜热通量与涡度协方差测量结果吻合良好。

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