北太平洋涛动与El Nino的关系及其年代际变化  

The Relationship Between North Pacific Oscillation with El Nio and Its Decadal Variability

作　　者：邓新林[1,2,3] 李春[1,2,3] 

机构地区：[1]中国海洋大学物理海洋实验室,山东青岛266100 [2]青岛海洋科学与技术协同创新中心,山东青岛266100 [3]海洋-大气相互作用与气候山东省高校重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2016年第6期42-51,共10页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41276002;41130859);国家重大研究计划发展项目(2012CB955603;2013CB956201);国家自然科学基金-山东海洋科学研究中心联合基金项目(U1406401)资助~~

摘　　要：基于HadISST海表温度和NCEP/NCAR的海平面气压等再分析资料,研究了北太平洋海平面气压主模态与El Nino的关系。结果发现：阿留申低压模态是对El Nino事件的同期响应,而北太平洋涛动模态可以诱导热带太平洋产生类似中部型El Nino的海温异常,且具有提前4～12个月的预报意义。冬春季的北太平洋涛动处于正位相时,阿留申低压与夏威夷高压同时减弱,北太平洋背景风场减弱。夏威夷高压东南侧西南风异常减弱北太平洋东北信风,使加利福尼亚海区SST暖异常,在＂风-蒸发-SST＂机制的作用下,异常暖海温向热带太平洋传播,使赤道地区海温升高并产生西风异常,热带太平洋产生类似中部型El Nino的异常海温。El Nino类型的年代际变化可能受到北太平洋涛动的影响,当北太平洋涛动信号活跃时,中部型El Nino事件的发生频率大。This study used the HadISST and NCEP/NCAR reanalysis dataset to examine the relationship between the North Pacificsea level pressure andtwo types of El Nino.It is found that the Aleutian Low mode is the real-time correspond to El Nino;the North Pacific Oscillation mode may give rise to central Pacific El Nino,which can forecast the El Nino for about 4～12months ahead.When the North Pacific Oscillation is on the positive（negative）phase,the Hawaii High and Aleutian Low is enhanced（weakened）,which relaxing（strengthening）the background circulation.The positive phase of North Pacific Oscillation in winter and spring weakens the trade wind,generating positive SST anomaly in the California sea area by the wind-evaporation-SST mechanism.The positive SST anomaly spread to the central tropical Pacific in spring and summer and forces a pattern of atmosphere circulation anomaly includingwesterly wind anomaly along the central and westerntropical Pacific,which contributes to the occurrence of CP El Nino.It is interesting that the root mean square of North Pacific Oscillation has significant decadal variability,corresponding to the decadal variability of two type of El Nino.From 1950 s to 1970 sand after 1990 s,the North Pacific Oscillation is active,the occurrence of central PacificEl Nino is more frequent;From 1970 sto 1990s,the Aleutian Low is more active,the tropical Pacific is dominated by the easternPacificEl Nino.

关 键 词：EL Nino 北太平洋涛动 “风-蒸发-SST”机制 年代际变化 

分 类 号：P732.6[天文地球—海洋科学]