Comparison of spectral surface albedos and their impact on the general circulation model simulated surface climate
Comparison of spectral surface albedos and their impact on the general circulation model simulated surface climate
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DOI：
10.1029/2001jd000809
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发表时间：
2002-07
影响因子：
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通讯作者：
A. Roesch;M. Wild;R. Pinker;A. Ohmura
中科院分区：
文献类型：
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作者：
A. Roesch;M. Wild;R. Pinker;A. Ohmura
[1]本研究探讨了光谱分辨表面反射率对总表面反射率的影响。由于大气水分对入射辐射的光谱分布有很大的影响，忽略短波光谱中的水分变化可能会导致很大的误差。结果表明，忽略地面辐射的光谱依赖性将影响气候预测。这项研究揭示了撒哈拉沙漠地表温度变化时，北方非洲气候的实质性变化。详细的信息是如何欧洲中心/汉堡环流模式（ECHAM 4）可以扩展到包括表面边界条件的可见光和近红外入射辐射。这包括无雪条件下可见光和近红外线的全球气候学，以及雪、陆地/海洋冰和积雪覆盖的森林上的相应可见光和近红外线的全球气候学。几个现有的地面气候学和一个新编制的气候学数据集之间的比较显示，在估计的气候学相当分散。在冰雪覆盖的森林地区以及干旱和半干旱地区发现最大的干旱差异。
[1] This study investigates the impact of spectrally resolved surface albedo on the total surface albedo. The neglect of albedo variation within the shortwave spectrum may lead to substantial errors as the atmospheric water greatly influences the spectral distribution of the incoming radiation. It is shown that ignoring the spectral dependence of the surface albedo will affect the predicted climate. The study reveals substantial changes in the climate over northern Africa when modifying the surface albedo of the Sahara deserts. Detailed information is given how the European Center/Hamburg General Circulation Model (ECHAM4) can be extended to include surface boundary conditions for both the visible and near-infrared incoming radiation. This comprises global climatologies for both the visible and near-infrared albedo for snow-free conditions, as well as the corresponding albedo values over snow, land-/sea ice and over snow covered forests. Comparisons between several available surface albedo climatologies and a newly compiled albedo data set show substantial scatter in estimated albedos. The largest albedo differences are found in snow covered forest regions as well as in arid and semi-arid terrains.