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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Explicit validation of a surface shortwave radiation balance model over snow-covered complex terrain
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Explicit validation of a surface shortwave radiation balance model over snow-covered complex terrain

机译：在积雪覆盖的复杂地形上的表面短波辐射平衡模型的明确验证

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摘要

A model that computes the surface radiation balance for all sky conditions in complex terrain is presented. The spatial distribution of direct and diffuse sky radiation is determined from observations of incident global radiation, air temperature, and relative humidity at a single measurement location. Incident radiation under cloudless sky is spatially derived from a parameterization of the atmospheric transmittance. Direct and diffuse sky radiation for all sky conditions are obtained by decomposing the measured global radiation value. Spatial incident radiation values under all atmospheric conditions are computed by adjusting the spatial radiation values obtained from the parametric model with the radiation components obtained from the decomposition model at the measurement site. Topographic influences such as shading are accounted for. The radiosity approach is used to compute anisotropic terrain reflected radiation. Validations of the shortwave radiation balance model are presented in detail for a day with cloudless sky. For a day with overcast sky a first validation is presented. Validation of a section of the horizon line as well as of individual radiation components is performed with high-quality measurements. A new measurement setup was designed to determine terrain reflected radiation. Them is good agreement between the measurements and the modeled terrain reflected radiation values as well as with incident radiation values. A comparison of the model with a fully three-dimensional radiative transfer Monte Carlo model is presented. That validation reveals a good agreement between modeled radiation values.
机译：提出了一个计算复杂地形中所有天空条件下的表面辐射平衡的模型。直接和漫射的天空辐射的空间分布是根据对单个测量位置处入射的整体辐射，空气温度和相对湿度的观察来确定的。无云天空下的入射辐射在空间上是由大气透射率的参数化得出的。通过分解测得的总辐射值，可以获得所有天空条件下的直接和漫射天空辐射。通过调整从参数模型获得的空间辐射值与从分解模型获得的测量部位处的辐射分量，来调整所有大气条件下的空间入射辐射值。考虑了诸如阴影之类的地形影响。光能传递方法用于计算各向异性地形反射的辐射。短波辐射平衡模型的验证详细介绍了无云天空的一天。对于天空乌云密布的一天，我们进行了首次验证。可以通过高质量的测量来验证视线的一部分以及各个辐射分量。设计了一种新的测量设置来确定地形反射的辐射。它们是测量值与建模的地形反射辐射值以及入射辐射值之间的良好一致性。将该模型与全三维辐射传递蒙特卡洛模型进行了比较。该验证揭示了建模辐射值之间的良好一致性。

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