期刊
ADVANCES IN ATMOSPHERIC SCIENCES
卷 26, 期 1, 页码 161-168出版社
SCIENCE PRESS
DOI: 10.1007/s00376-009-0161-6
关键词
Tibetan Plateau; surface albedo; parameterization; solar altitude angle; soil moisture
资金
- National Basic Research Program of China [2005CB422003]
- National Natural Science Foundation of China [40875005]
- Program of Institute of Plateau Meteorology of China Meteorological Administration [BROP200803]
- Asia-Australia Monsoon Project
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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