| 青藏高原地区地表及行星反射率 |
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| 引用本文： | 孙治安,翁笃鸣.青藏高原地区地表及行星反射率[J].应用气象学报,1994,5(4):394-401. |
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| 作者姓名： | 孙治安 翁笃鸣 |
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| 作者单位： | 1.南京气象学院 |
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| 摘 要： | 文章讨论了利用ISCCP卫星观测资料确定青藏高原地区地表反射率的方法，在无积雪地区和季节，地表反射率可以ISCCP可见光反射率为基础，在模式计算过程中，假定紫外反射率以及红外与可见光反射率的比值分别为常数。敏感性试验表明，由这两个假设所产生的误差并不显著。在有积雪地区或季节，地表平均反射率可直接由ISCCP可见光反射率表示。试验结果与地面实际观测作了比较，除沙漠区外，两者比较一致。文中还计算了高原晴天行星反射率。经与ERBE卫星观测比较，发现从5月至9月高原周围沙漠区气溶胶对辐射平衡有较显著的影响。而在其
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| 关 键 词： | 青藏高原 地表反射率 行星反射率 |
Surface and Planetary Albedo over the Tibetan Plateau |
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| Sun Zhian.Surface and Planetary Albedo over the Tibetan Plateau[J].Quarterly Journal of Applied Meteorology,1994,5(4):394-401. |
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| Authors: | Sun Zhian |
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| Affiliation: | 1.1) (Dept. of Meteorology, Reading University, Reading RG62AU, U. K.); 2) (Nanjing Institute of Meteorology, Nanjing 210035) |
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| Abstract: | Using the ISCCP satellite data the method of determining the surface albedo over the Tibetan Plateau is discussed. On the snow-free surface, the broadband surface albedo can be calculated using radiation model based on the visible albedo provided by ISCCP. It is assumed in the calculations that the ultraviolet albedo and the ratio of the near infrared to visible albedo are both constant. It is found by sensitivity study that the assumptions would not introduce significant error in the calculations. On the mixed snow and snow-free surface, the broadband surface albedo can be expressed directly by the ISCCP visible albedo. The test results have been compared with the surface observations and agree well with them except in the desert areas. The planetary albedo in clear day over Tibetan Plateau is also computed. It is found by comparison with the ERBE satellite observations that the aerosols in the desert area around the Plateau have a significant influence on radiation budget from May to September. In the rest months, however, the effect of aerosols can be neglected. The results of model calculations are generally in good agreement with the ERBE measurements. |
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| Keywords: | Tibetan Plateau Surface albedo Planetary albedo |
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