我国夏季降水与青藏高原春季NDVI的关系

利用1982年1月-2001年12月NDVI资料、台站降水资料和NCEP/NCAR再分析资料, 通过相关分析和合成分析方法, 初步分析了我国夏季降水与青藏高原春季植被的关系及可能机理。结果发现:青藏高原春季NDVI与我国夏季降水相关系数从南到北呈西北-东南向“ + - +”带状分布。合成分析也表明:青藏高原春季NDVI大、小值年降水年内分布也存在明显差异。降水的上述差异, 可能是由于青藏高原春季NDVI变化导致热源效应改变, 引起大气环流变化造成的。对环流分析也发现:大气环流的变化特征与降水变化表现出很好的一致性。

The Relationship Between Summer Rainfall over China and Spring NDVI Variability in Tibetan Plateau

The influences of spring NDVI variability over Tibetan Plateau on China summer rainfall and its mechanism are investigated through the correlation analysis and composite analysis using normalized difference vegetation index (NDVI), the monthly mean rainfall and the NCEP/NCAR reanalysis datasets for the period of 1982-2001. Overall, the correlation coefficient between spring NDVI and summer rainfall takes on a spatial distribution pattern " + - +" from northwest to southeast. An obvious annual rainfall difference is also observed in high and low spring NDVI over Tibetan Plateau by composite analysis. The cause for the different regions in rainfall maybe is general circulation variability over China and other related regions, which is attributed to heat source variability in Tibetan Plateau that originated from spring NDVI variability.