山西省终霜冻变化及其与春季北太平洋海温的SVD分析

摘 要：利用山西省35个代表站1971-2008年逐年终霜冻资料和美国NCEP/NCAR再分析资料的全球逐月海温格点(2°×2°)资料，采用小波分析、EOF和SVD分解等方法讨论了山西省终霜冻的时空变化特征以及与北太平洋海温的关系。结果表明：山西省终霜冻时空分布不均匀，存在显著的年际和年代际变化特征。山西省终霜冻有提前的趋势。山西省终霜冻异常存在3年、5年、15年的周期；影响终霜冻的春季海温关键区是（20°S~35°N，110~160°E ），山西省春霜冻与该关键区春季海温是显著的负相关关系，即春季海温关键区海温异常偏高（低），山西省终霜冻偏早（晚）。

The Characteristic of Annually Last Frost in Shanxi and SVD Analysis Between the Last Frost and the North Pacific SST in Spring

Based on the annually last frost data of 35 stations in Shanxi during 1971—2008 and the mean monthly reanalysis SST data（grid：2°×2°）of NCEP/NCAR, the temporal-spatial characteristics of the last frost in Shanxi and the relationship of the sea surface temperature in spring of the northern Pacific Ocean are investigated in terms of wavelet analysis, empirical orthogonal function（EOF）, singular value decomposition （SVD）and else. Results show that the temporal evolution and spatial distribution of the last frost are not homogeneous in Shanxi. There are prominent inter-annual and inter-decadal variability of the last frost. The last frost anomaly existed 3-year, 5-year, 15-year periodic variation in Shanxi. And the relationship between the last frost and SST over the northern Pacific Ocean are investigated, The key region which influences the last frost anomaly has been found. And the SST of the key region has the best negative correlation with the last frost.