A review of snow and ice albedo and the development of a new physically based broadband albedo parameterization
A review of snow and ice albedo and the development of a new physically based broadband albedo parameterization
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DOI：
10.1029/2009jf001444
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发表时间：
2010-03-05
影响因子：
3.9
通讯作者：
Sharp, Martin J.
中科院分区：
文献类型：
--
作者：
Gardner, Alex S.;Sharp, Martin J.
我们提出了一种计算简单、基于理论的冰雪宽带反照率参数化方法，可以准确地再现冰雪和大气条件下的理论宽带反照率。根据应用的不同，这种参数化需要1到5个输入参数。这些参数是雪/冰的比表面积、吸光碳的浓度、太阳天顶角、云光学厚度和雪深。参数化是通过将方程拟合到与类似大气模型耦合的16流平面平行、离散坐标的冰雪辐射传输模型所产生的反照率估计值得到的。该模式的输出还用于建立冰雪光谱反照率的物理决定因素，并评估冰雪覆盖表面的光谱辐照度特征。将辐射传输模型确定的宽带反照率估计与先前提出的一系列参数化的结果进行了比较。与这些参数化相比，新提出的参数化可以在更大范围的雪、冰和大气条件下产生准确的结果。
We present a computationally simple, theoretically based parameterization for the broadband albedo of snow and ice that can accurately reproduce the theoretical broadband albedo under a wide range of snow, ice, and atmospheric conditions. Depending on its application, this parameterization requires between one and five input parameters. These parameters are specific surface area of snow/ice, concentration of light-absorbing carbon, solar zenith angle, cloud optical thickness, and snow depth. The parameterization is derived by fitting equations to albedo estimates generated with a 16-stream plane-parallel, discrete ordinates radiative transfer model of snow and ice that is coupled to a similar model of the atmosphere. Output from this model is also used to establish the physical determinants of the spectral albedo of snow and ice and evaluate the characteristics of spectral irradiance over snow-covered surfaces. Broadband albedo estimates determined from the radiative transfer model are compared with results from a selection of previously proposed parameterizations. Compared to these parameterizations, the newly proposed parameterization produces accurate results for a much wider range of snow, ice, and atmospheric conditions.