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Abstract
Surface longwave emissivity can be less than unity and vary significantly with frequency. However, most ESMs still assume a blackbody surface in the longwave (LW) radiation scheme of their atmosphere models. Moreover, ice cloud in the far-IR can have a single scattering albedo as large as 0.8, while most ESMs still assume non-scattering clouds in the LW. The two issues can manifest in the high latitudes where atmospheric column water vapor is much less than in the mid-latitudes and tropics. The study is motived by such issues and aimed at improving the representation of surface-atmosphere radiative coupling in the models.
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