与不同El Nino相伴的IOD事件的季节演变特征对比

被引：6

作者：

祁莉 ^{[1
,2
]}

何珊珊 ^{[1
,2
]}

张文君 ^{[1
,2
]}

何金海 ^{[1
,2
]}

机构：

[1] 南京信息工程大学气象灾害预报预警与评估协同创新中心

[2] 气象灾害教育部重点实验室(南京信息工程大学)

来源：

大气科学学报 | 2014年 / 37卷 / 06期

关键词：

印度洋偶极子; 两类El Nio; 季节演变; 海气耦合;

D O I：

10.13878/j.cnki.dqkxxb.20140328001

中图分类号：

P732.6 [海洋与大气的相互关系];

学科分类号：

0706 ; 070601 ;

摘要：

基于1951—2012年逐月海洋和大气多种要素的再分析资料,分析了与两类El Nino相伴的IOD(Indian Ocean Dipole,印度洋偶极子)事件盛期的海洋和大气异常特征,并进一步对比了与不同类型El Nino相伴的IOD事件的季节演变及对应的海气耦合过程。结果表明:两类IOD事件盛期时,暖海温强度和位置有显著差异。发生在东部型El Nino期间的IOD事件(简称EP-IOD)盛期,正(负)SSTA中心出现在热带西北(赤道东南)印度洋,强度相当,对应的热带印度洋—海洋大陆异常Walker环流强度较强、范围较大;与中部型CP El Nino相伴的IOD事件(简称CP-IOD)的正SSTA相对较弱,且偏于南印度洋,异常Walker环流较弱、较窄。在季节演变中,两类IOD事件期间的局地海气过程差异显著,伴随着西印度洋西南季风减弱和东印度洋异常东风加强,EP-IOD事件的发展以西正东负的偶极型异常海温的出现及加强为主要特征;而CP-IOD事件的发生发展则与西北印度洋异常冷海温的生消及南印度洋暖水的堆积相伴,表现为"-+-"三极型SSTA的出现并转为西正东负偶极型的过程,夏季时出现在东印度洋的异常东风以及赤道中印度洋低层负涡度异常水平环流对其发展具有重要作用。

引用

页码：673 / 683

页数：11

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