海温对辽宁省主汛期降水异常影响的统计分析  

Statistical Analysis of the Effect of Sea Surface Temperature Anomaly on FloodSeason Precipitation in Liaoning Province

作　　者：杨文艳[1] 王谦谦[1] 

机构地区：[1]南京信息工程大学大气科学系

出　　处：《南京气象学院学报》2005年第3期404-409,共6页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40233037)

摘　　要：在对辽宁省主汛期降水异常的时变特征进行分析的基础上,研究了前期海温场对辽宁主汛期(7-8月)降水影响的统计特征.结果表明:1)辽宁省汛期降水异常有明显的年际、年代际变化特征,近44a降水呈减少趋势.小波分析表明存在3～5 a的年际周期和10～12 a的年代际周期.2)存在2个影响辽宁汛期降水异常的海温关键区及相应的关键时段,它们分别是南大西洋(1-5月)和西太平洋(3-4月),综合考虑2个关键区可更好地预示辽宁汛期降水的异常.Statistical features of the impact of the previous sea surface temperature anomalies (SSTA) on the main flood season(July to August) precipitation in the Liaoning Province are found in this paper based on a background analysis of the temporal variation of the precipitation.Results show that the precipitation has obvious inter-annual and inter-decadal decrease trends in the recent 44 years.There are 35-year inter-annual and 1012-year inter-decadal periods as depicted with the wavelet analysis.Two key SSTA areas and their key time periods are found,one is the south Atlantic and the other is the western Pacific.By combination of the SSTA variations in the two sea areas,the main flood season precipitation anomaly in Liaoning Province might be better predicted.

关 键 词：辽宁省 主汛期降水 海温异常 关键区 关键时段 

分 类 号：P461.2[天文地球—大气科学及气象学]