江南地区汛期降水与热带海温关系的SVD分析

江南汛期降水异常的分析指出,6月是江南最易发生降水异常的一个月。从空间分布看,降水异常最易发生在江南的中部地区。用SVD方法分析发现,与江南汛期降水异常相关的海温异常分布型是“翘翘板”型,关键区恰好位于相关最显著的部位,前一年5～7月为海温的关键影响时段,且与汛期中4～5月的降水有最好的负相关关系。在该海温异常型影响下,次年中国东部4～6月的降水异常表现为长江南北的反位相变化特征,而江南地区位于该雨型相关显著的部位,江南中部为其影响最显著的区域。

SVD Analysis of the Relationship Between Jiangnan Rainy Season Precipitation and Sea Surface Temperature in the Tropical Oceans

Analysis of the climatological features of Jiangnan rainy season precipitation anomalies shows that the month with the most frequent anomalies of precipitation in Jiangnan is June and the region is located in the middle of Jiangnan. The SVD analysis points out that the related sea surface temperature anomaly (SSTA) distributes in the pattern as a "seesaw". The key region is just located in the most evident correlation area. The key period of SSTA impact is from May to July in the previous year in which SSTA has the best negative correlation with April to May precipitation in Jiangnan. Under the influence of SSTA "seesaw" pattern the precipitation anomalies in the following April to June in East China exhibit opposite phase on both sides of the Yangtze River, the most evident correlative region is Jiangnan and the middle of which is located in the most obvious area of SSTA impacts.