| 1976/1977年前后热带印度洋海表温度年际异常的变化 |
| |
| 引用本文： | 赵珊珊,周天军,杨修群,等.1976/1977年前后热带印度洋海表温度年际异常的变化[J].大气科学,2008,32(2):371-379. |
| |
| 作者姓名： | 赵珊珊 周天军 杨修群 等 |
| |
| 作者单位： | 1.中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京,100029;国家气候中心气候影响评估室,北京,100081 |
| |
| 基金项目： | 中国科学院大气物理研究所LASG国家重点实验室开放课题，国家重点基础研究发展规划项目2006CB403600、2004CB418303，中国气象局行业专项GYHY200706010，国家自然科学基金资助项目40730953、40425009 |
| |
| 摘 要： | 基于1948～2005年NCEP/NCAR（美国大气研究中心/环境预测中心）再分析资料，讨论了1976/1977年前后的年代际气候变化对热带印度洋海表温度（SST）年际变率特征的影响，结果表明:在气候变化前后，ENSO都能导致热带印度洋SSTA（海表面温度异常）出现全海盆同号的变化，这种模态在冬季最强；气候变化前与变化后相比，该模态对该地区海温年际变率的方差贡献大22.1%， 达到最强的时间早2个月。气候变化前，秋季热带印度洋SSTA的主导年际变率模态表现为全海盆同号，变化后则表现为“偶极子模态”（IODM）。导致上述SSTA特征变化的重要原因，是气候变化前后印度洋风场对ENSO的响应不同。在气候变化前，与ENSO相关联的热带印度洋东风异常首先在夏季出现，而变化后则首先在春季出现，并且有一反气旋性环流异常维持在热带东南印度洋。
|
| 关 键 词： | 气候变化 热带印度洋 ENSO 海盆同号变化 偶极子 |
| 文章编号： | 1006-9895（2008）02-0371-09 |
| 收稿时间： | 2006-06-05 |
| 修稿时间： | 2007-03-01 |
Interannual Variation of the Tropical Indian Ocean Sea Surface Temperature Pre- and Post-1976/1977 |
| |
| ZHAO Shan-Shan,ZHOU Tian-Jun,YANG Xiu-Qun and et al.Interannual Variation of the Tropical Indian Ocean Sea Surface Temperature Pre- and Post-1976/1977[J].Chinese Journal of Atmospheric Sciences,2008,32(2):371-379. |
| |
| Authors: | ZHAO Shan-Shan ZHOU Tian-Jun YANG Xiu-Qun and |
| |
| Abstract: | Based on 58-year(1948-2005) NCEP/NCAR reanalysis data,interannual variation of the tropical Indian Ocean sea surface temperature pre-and post-1976/1977 is studied.The original data are filtered to retain the variation with periods from 13 months to 8 years.The results show that ENSO could cause a basin-wide warming/cooling mode with the strongest phase in winter in the tropical Indian Ocean which lags ENSO 2-6 months both pre-and post-1977.But the mode pre-1977 is stronger than that post-1977.The former leads the latter two months in phase.Prior to 1977,the dominant mode of the tropical Indian Ocean SSTA(SST anomaly) in autumn appeared as a basin-wide uniform pattern.After 1977,however,the dominant mode appeared as a dipole or zonal gradient pattern.Changes in the response of the Indian Ocean surface wind to ENSO pre-and post-1977 account for the shift of dominant mode.Prior to 1977,the ENSO-related anomalous tropical Indian Ocean surface easterly firstly appeared in summer.After 1977,however,it appeared firstly in spring and a strong anticyclone dominated the southern tropical Indian Ocean throughout the season. |
| |
| Keywords: | climate shift ENSO basin-wide warming/cooling mode the tropical Indian Ocean dipole |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《大气科学》浏览原始摘要信息 |
| 点击此处可从《大气科学》下载免费的PDF全文 |
