摘要
采用 EOF(Empirical Orthogonal Function)、SVD(Singular Value Decompo-sition)、相似、相关以及合成分析等方法 ,探讨了北太平洋浅层海温 (ST)层际间时空结构的差异 ,据此对浅层海温场进行分层 ,并研究其与海平面气压场的相互作用。结果表明 :北太平洋浅层海温距平场第 1模态及其时间系数基本上反映了该海区浅层海温场的时空特征。1月浅层海温场可划分为两层 ,7月可划分为 4层 ,说明 7月的浅层海温分布较 1月复杂。海气相互作用的主要时域特征为明显的年代际变化 ,正负值转变主要发生在中后期。海气相互作用分析表明 ,当北太平洋中部 ST持续偏高时 ,相应的 1(7)月阿留申低压 (北太平洋副高 )偏弱 ,位置偏西 ,其西侧冬 (夏 )季风偏弱 ;反之亦然。
Based on examing the differences of temporal spatial characteristics of sub surface sea temperature(ST) among levels over the Northern Pacific by using EOF,SVD,analogical,correlation and composition methods,ST is detached in levels,which is used to study its interactions with sea level pressure(SLP) fields.Evidence suggests that:1)the first mode and its time coefficients can basically reflect the temporal spatial features of ST over this area;2)ST for January is separated into two levels and that for July into fourlevels,which indicates that the structure in July is more complicated than that in January;3)The temporal characteristics of air sea interaction is remarkably interdecadal variation,with the 'break' taking place in the late 1970s;4)When ST over the central North Pacific is persistently on the high side,the corresponding Aleutian low in January(North Pacific subtropical high in July) is weaker,with lying to the west of the normal position and weaker winter(summer)monsoon,and v.v..
出处
《南京气象学院学报》
CSCD
北大核心
2003年第2期145-154,共10页
Journal of Nanjing Institute of Meteorology
基金
江淮梅雨的年际和年代际变化规律及其机制研究项目 ( 40 2 330 37)
