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Modeling of the influence of snow reflectance on ultraviolet irradiance for cloudless sky

机译:雪反射对无云天空紫外线辐射影响的建模

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The amplification of UV irradiance at the Earth's surface that is due to successive reflections between the snow-covered ground and the scattering atmosphere is analyzed by a method based on decoupling the atmosphere and the surface functions. For a uniform Lambertian surface the amplification factor for the global irradiance depends only on the product of the surface reflectance and the atmospheric backscatter. It varies with wavelength, reaching a maximum near 320 nm; this maximum is close to 50% for clean snow. In UV-B the amplification depends strongly on tropospheric ozone. For non-Lambertian, nonuniform surfaces it is possible, by the same method, to define effective or average reflectances. (C) 1998 Optical Society of America. [References: 19]
机译:通过基于使大气与地表函数解耦的方法来分析由于积雪覆盖的地面与散射大气之间的连续反射而导致的地球表面紫外线辐射的放大。对于均匀的朗伯表面,全局辐照度的放大因子仅取决于表面反射率与大气反向散射的乘积。它随波长变化,在320 nm附近达到最大值。对于干净的雪,此最大值接近50%。在UV-B中,放大率很大程度上取决于对流层臭氧。对于非朗伯,非均匀表面,可以通过相同方法定义有效或平均反射率。 (C)1998年美国眼镜学会。 [参考:19]

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