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Proceedings Paper

Comparison of different methods for the determination of the average UV albedo in a mountainous terrain
Author(s): Philipp Weihs; Stana Simic; G. Rengarajan; Wolfgang Laube; W. Mikielewicz
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Paper Abstract

One aim of the project CUVRA was to improve the modeling of effects of inhomogeneous albedo fields on ground UV irradiance. For the determination of the effect of heterogeneous illumination (shading effects, inclination and orientation of the facet) on the reflectivity of a facet in a mountainous region more complex approaches (than for the calculation of the reflectivity of flat surfaces) have to be chosen. We determined the 'effective' albedo for the surroundings of the Observatory Sonnblick (3106 m) by using three different methods. The first method consisted of a combination of a 3D albedo model calculation and 1D radiative transfer calculation. By using this method and a digital elevation map, the reflectivity of the region surrounding Sonnblick Observatory was calculated. The second method was an inversion method using a 1D radiative transfer model. The routine spectral UV measurements performed at Sonnblick were used to calculate the average effective albedo. The third method was entirely experimental. An albedo measuring system was used to perform reflectivity measurements of the surrounding of Sonnblick. Overall, the results showed that the average albedo of a topographically structured surface is lower than the average albedo of a corresponding (surface with same ground characteristics) flat surface.

Paper Details

Date Published: 17 January 2002
PDF: 8 pages
Proc. SPIE 4482, Ultraviolet Ground- and Space-based Measurements, Models, and Effects, (17 January 2002); doi: 10.1117/12.452947
Show Author Affiliations
Philipp Weihs, Univ. fuer Bodenkultur (Austria)
Stana Simic, Univ. fuer Bodenkultur (Austria)
G. Rengarajan, Univ. fuer Bodenkultur (Austria)
Wolfgang Laube, Univ. fuer Bodenkultur (Austria)
W. Mikielewicz, Univ. fuer Bodenkultur (Austria)

Published in SPIE Proceedings Vol. 4482:
Ultraviolet Ground- and Space-based Measurements, Models, and Effects
James R. Slusser; Jay R. Herman; Wei Gao, Editor(s)

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