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大气科学  2011 

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

DOI: 10.3878/j.issn.1006-9895.2011.02.12

Keywords: 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

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Abstract:

利用NOAASST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ENSO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。

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