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首页> 外文期刊>Applied optics >Effect of topography on average surface albedo in the ultraviolet wavelength range
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Effect of topography on average surface albedo in the ultraviolet wavelength range

机译：地形对紫外线波长范围内平均表面反照率的影响

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摘要

The reflectivity of the 22km×24km region surrounding Sonnblick Observatory near Salzburg, Austria (3104-m altitude, 47.05°N, 12.95°E), was calculated with a three-dimensional albedo model. The average albedo of the region was calculated at 305 and 380 nm for different solar zenith angles, ground reflectances, and solar azimuth angles. To determine geometrical effects, we first carried out the simulations without taking account of the effects of the atmosphere. The ratio to the reflectivity of a corresponding flat surface area (area with the same ground characteristics) was always less than 1 and showed a decrease with increasing solar zenith angle and with diminishing ground reflectance. Even when the ground reflectance was 100%, the average albedo was less than 1. The effect of the atmosphere was then taken into consideration in these calculations and was found to diminish the reflected components. This diminishing effect was compensated for, however, by the scattered irradiance. Finally, simulations of real conditions (nonhomogeneous ground reflectivities) were performed for different snow lines in the Sonnblick region. The average albedos obtained when all the surroundings were covered with snow were 0.32-0.63 with low solar zenith angles and 0.38-0.77 with a 40° solar zenith angle.
机译：利用三维反照率模型计算了奥地利萨尔茨堡附近Sonnblick天文台周围22km×24km区域的反射率（3104-m高度，47.05°N，12.95°E）。针对不同的太阳天顶角，地面反射率和太阳方位角，计算了该区域在305和380 nm处的平均反照率。为了确定几何效果，我们首先进行了模拟，而没有考虑到大气的影响。相应的平坦表面区域（具有相同地面特征的区域）与反射率的比率始终小于1，并且随着太阳天顶角的增大和地面反射率的减小而减小。即使地面反射率为100％，平均反照率也小于1。然后在这些计算中考虑了大气的影响，并发现减少了反射成分。但是，这种减弱的效果被散射的辐照度所补偿。最后，对Sonnblick地区不同的雪线进行了真实条件（非均匀地面反射率）的模拟。当所有周围环境都被雪覆盖时，获得的平均反照率分别为0.32-0.63（太阳天顶角低）和0.38-0.77（太阳天顶角为40°）。

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