A Study on Parameterization of Surface Albedo over
Grassland Surface in the Northern Tibetan Plateau |
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| Authors: | LI Ying and HU Zeyong |
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| Institution: | Laboratory for Climate Environment and Disasters of Western China,
Cold and Arid Regions Environmental and Engineering Research Institute,
Chinese Academy of Sciences, Lanzhou 730000;
Institute of Plateau Meteorology, China Meteorological Administration;Laboratory for Climate Environment and Disasters of Western China,
Cold and Arid Regions Environmental and Engineering Research Institute,
Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | The relationship of surface albedo with the solar altitude angle and soil moisture is
analyzed based on two-year (January 2002 to December 2003) observational data from the AWS
(Automatic Weather Station) at MS3478 in the northern Tibetan Plateau during the experimental
period of CEOP/CAMP-Tibet (Coordinated Enhanced Observing Period Asia-Australia Monsoon Project
on the Tibetan Plateau). As a double-variable (solar altitude angle and soil moisture) function,
surface albedo varies inconspicuously with any single factor. By using the method of approximately
separating the double-variable function into two, one-factor functions (product and addition),
the relationship of albedo with these two factors presents much better. The product and additional
empirical formulae of albedo are then preliminarily fitted based on long-term experimental data.
By comparison with observed values, it is found that the parameterization formulae fitted by using
observational data are mostly reliable and their correlation coefficients are both over 0.6. The
empirical formulae of albedo though, for the northern Tibetan Plateau, need to be tested by much
more representative observational data with the help of numerical models and the retrieval of
remote sensing data. It is practical until it is changed into effective parameterization formulae
representing a grid scale in models. |
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| Keywords: | Tibetan Plateau surface albedo parameterization solar altitude angle soil moisture |
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