南半球对流层大气对热带太平洋—印度洋海温异常综合模的响应及其机制解释  

Teleconnection Mode between the Tropical PacificIndian Ocean Temperature Anomaly and Southern Hemisphere Tropospheric Circulation and Its Mechanism

作　　者：周秋林[1] 梅士龙[1] 

机构地区：[1]浙江省嘉兴市气象局,嘉兴314050

出　　处：《大气科学》2011年第2期339-349,共11页Chinese Journal of Atmospheric Sciences

摘　　要：利用NOAA SST及NCEP/NCAR再分析资料,研究了热带太平洋—印度洋海温异常综合模和南半球对流层大气之间的遥相关模态并对其进行了机制解释。首先通过相关和合成分析,给出了遥相关的空间模态,结果表明：北半球秋、冬季,在南半球对流层大气存在和热带太平洋—印度洋海温异常综合模密切联系的遥相关作用中心,该中心的分布构成一列明显的从赤道中太平洋出发,最终到达非洲中南部及赤道印度洋的Rossby波列,将赤道太平洋、印度洋与南半球中高纬度大气连接起来,起到了类似＂大气桥＂的作用。而单纯IOD和单纯EN-SO均难以在南半球对流层激发出遥相关波列,进一步证实了两者共同作用的影响。其次,利用行星波能量传播理论对两者之间的遥相关进行了机制分析,发现纬向波数为1~3的大气行星波的能量传播是热带太平洋—印度洋海温异常综合模与南半球对流层大气之间遥相关的一种可能的联系方式。The teleconnection mode between the tropical Pacific-Indian Ocean temperature anomaly and Southern Hemisphere tropospheric circulation and its mechanism are studied through NOAA SST and NCEP/NCAR reanalysis data sets.First of all,spatial teleconnection mode is presented by using correlation and composition analyses and results show that there are obvious characteristics of remote response in the Southern Hemisphere troposphere closely related with the tropical Pacific-Indian Ocean temperature anomaly in boreal autumn and winter.These centers of action compose a Rossby wave train,starting from the middle of the tropical Pacific and ending in southern Africa and the tropical Indian Ocean.The train links the tropical Pacific,the Indian Ocean to the Southern Hemisphere high latitudes and plays a similar ＂atmosphere bridge＂ role.However,the pure IOD（Indian Ocean Dipole） and pure ENSO are difficult to excite teleconnection wave train in the Southern Hemisphere,which further confirms the interaction between them.Secondly,the theory of planetary wave energy propagation can be used to explain the teleconnection.It is found that the energy propagation of planetary wave with zonal numbers 1-3 is the possible mechanism for the teleconnection between the tropical Pacific-Indian Ocean temperature anomaly and the Southern Hemisphere tropospheric circulation.

关 键 词：热带太平洋—印度洋海温异常综合模 南半球对流层 遥相关 行星波能量传播 

分 类 号：P461[天文地球—大气科学及气象学]