黄土高原春季降水对青藏高原感热异常的响应

利用1961—2000年黄土高原56站的春季降水和NCEP/NCAR再分析资料,采用SVD方法分析了黄土高原春季降水与青藏高原地面感热的关系。结果表明,黄土高原春季降水量与青藏高原地面感热的前两个模态代表了两场间的主要耦合特征,具有高度的时空相关。青藏高原感热对黄土高原降水影响最显著的区域在西部和南部、北部。前期高原感热场的第一、二模态对黄土高原春季干旱的预测具有指示意义。

Response of Spring Precipitation in Loess Plateau to Surface Sensible Heat in Qinghai-Xizang Plateau

We used the Singular Value Decomposition(SVD) technique to analyze the relationship between sensible heat field in the Tibetan Plateau and spring precipitation in the Loess Plateau,based on the spring precipitation data during 19612000 from the 56 meteorological stations on the Loess Plateau and re-analyzed NCEP/NCAR data.The result showed that the first two modes derived from SVD indicated the principal coupled characteristics of the sensible heat field and the precipitation field,having closely time-space correlation.The most responding regions of regional spring precipitation to previous abnormity of the sensible heat on Qinghai-Xizang Plateau situate at the west,the south and the north of the Loess Plateau.It was found that the variation of the first two modes derived from SVD with the previous sensible heat field in the Qinghai-Xizang Plateau is a signal for the prediction of spring precipitation in the Loess Plateau.