1982～2000年青藏高原地表反照率时空变化特征

摘要

[目的]研究青藏高原地表反照率的时空分布和变化特征.[方法]通过对NOAA/AVHRR数据反演的青藏高原地区地表反照率的不同算法进行验证,确认由Stroeve给出的反演结果最接近于观测值.基于Stroeve的反演算法.利用1982～2000年的NOAA/AVHRR数据,反演得到1982～2000年青藏高原地区地表反照率的空间分布.[结果]青藏高原地区年均地表反照率的分布与高原自然地理带的分布特征大致吻合;高原区域年均地表反照率呈缓慢下降趋势,不同地区的变化趋势有所不同;高原地区月均地表反照率有明显的地带性,且随时间的变化比较明显.[结论]该研究有助于改进气候模式中地面反射率的参数化方案,揭示局地和区域气候变化的内在机制,提高中长期气候预报的水平.%This paper aims to study the temporal and spatial variation of surface Albedo in Tibetan. [ Methods ] By using NOAA/rnAVHRR data, different algorithms were used to retrieve surface albedo in Tibetan Plateau, and it showed that the result of retrieval algorithm rnfrom Stroeve was mostly close to observed value. Based on retrieval algorithm from Stroeve, the spatial distribution of surface albedo in Tibetan rnPlateau was obtained by means of NOAA/AVHRR data during 1982 -2000. [ Resuts] The results revealed that the distribution of annual mean rnsurface albedo in Tibetan Plateau was identical with that of geographical zone in plateau area; annual mean surface albedo in plateau area rnshowed slight decrease trend which was different in various regions; monthly surface albedo in plateau area had obviously zonal distribution and rnchanged with time evidently. [ Conclusions] Our results will be helpful to improving the parameterization scheme of surface albedo in climate rnmodel, revealing the internal mechanism of local and regional climate change and enhancing the level of long-term climate forecast.