Approximating the average daily surface albedo with respect to soil roughness and latitude |
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| Authors: | Jerzy Cierniewski Arnon Karnieli Krzysztof Ku?nierek Alexander Goldberg Ittai Herrmann |
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| Affiliation: | 1. Department of Soil Science and Remote Sensing of Soils , Institute of Physical Geography and Environmental Planning, Adam Mickiewicz University , 61-680 , Poznań , Poland ciernje@amu.edu.pl;3. The Remote Sensing Laboratory , Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev , Sede-Boker , Israel;4. Department of Soil Science and Remote Sensing of Soils , Institute of Physical Geography and Environmental Planning, Adam Mickiewicz University , 61-680 , Poznań , Poland |
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| Abstract: | The present study explores the diurnal variations in blue-sky albedo (α) of soils under clear sky conditions with respect to surface roughness. Three roughness levels of ploughed and unploughed soil surfaces, developed from the same loessial material, were examined. The relation between α of the surfaces and the solar zenith angle, determined during the experiment, enabled us to predict the diurnal α variation of the surfaces throughout the year at a given latitude, between 75° S and 75° N. The optimal time (T O) for measuring the soil albedo by an instantaneous observation was considered as the best represented time for the daily averaged value within an error lower than ±2%. It was found that the T O, falling at different times depending on the soil surface roughness, limits the possibilities of data achievement by remote-sensing satellites along one of their sun-synchronous orbits. |
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