Influence of horizontal inhomogeneity on albedo and absorptivity of snow cover |
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| Authors: | T B Zhuravleva A A Kokhanovskii |
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| Institution: | 1.Institute of Atmospheric Optics, Siberian Division,Russian Academy of Sciences,Tomsk,Russia;2.Institute of Remote Sensing,Bremen University,Bremen,Germany |
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| Abstract: | The variations of albedo and absorptivity of the snow cover are considered caused by the presence of the snow roughness in
the form of sastrugi. The numerical modeling is carried out within the framework of statistical approach based on the analytic
averaging of the radiative transfer equation and statistically homogeneous model on the basis of Poisson flows of points at
the straight lines. The estimates of the influence of 3D-effects of the rough surface are represented depending on optical
and geometrical characteristics of sastrugi and on the illumination conditions. It is demonstrated that if the absorption
by the snow particles is weak (the single scattering albedo w = 0.9999) the reflection of radiation by snow decreases by ∼ 2–3% when the sastrugi appear. This effect is more significant
in near infrared spectral region where w is below 0.99. |
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