摘要
在对盛夏7、8月及夏季（6～8月）平均的500 hPa高度场和同期山东降水场分别进行奇异值分解（SVD）分析的基础上,根据高度场时间系数的大小选取特征年进行高度场合成.发现夏季西太平洋副热带高压的位置、强度异常对山东夏季降水有重要影响.副高强度偏弱、位置偏北时,对应山东多雨;强度偏强、位置偏南偏西时,山东少雨.此外,南海、菲律宾等地高度场的异常与副高的位置、强度间有重要的关系.当前者处显著的正距平时,副高强度强、西伸明显;当前者处显著的负距平时,副高强度易偏弱、但位置偏北.
Some special years were identified by using the singular value decomposition （SVD） analysis between 500 hPa height fields and Shandong precipitation in the same periods： July, August and summer, respectively. The 500 hPa height fields in special years were synthesized, and the results indicate： The unconventionality of the position and strength of the western subtropical high has an important influence on Shandong precipitation. While the western subtropical high is weaker and its position is farther northern, there is more rainfall in Shandong; and while the western subtropical high is stronger and its position is farther southern and western, there is less rainfall in Shandong. In addition, the unconventionality of the 500 hPa height field over the South China Sea and Philippines has close relation with the western subtropical high.
出处
《气象科技》
2006年第1期62-67,共6页
Meteorological Science and Technology
