POSSIBLE INFLUENCES OF THE TROPICAL INDIAN OCEAN DIPOLE ON THE EASTWARD PROPAGATION OF MJO
POSSIBLE INFLUENCES OF THE TROPICAL INDIAN OCEAN DIPOLE ON THE EASTWARD PROPAGATION OF MJO
复制标题
热带印度洋偶极子对MJO东传的可能影响
DOI：
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发表时间：
2012
影响因子：
1.2
通讯作者：
Li Chongyin
中科院分区：
文献类型：
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作者：
Yuan Yuan;Yang Hui;Li Chongyin
基于多个数据集、相关性和复合分析以及案例研究，本文研究了印度洋偶极子（IOD）模对热带大气季节内振荡东传的可能影响，结果表明：（1）印度洋东南部30~60天的出射长波辐射（OLR）异常和印度洋东南部30~60天的出射长波辐射异常对热带大气季节内振荡东传的影响是显著的。赤道中印度洋850 hPa纬向风异常与IOD指数有显著的相关关系;（2）在IOD为正的年份，东南印度洋异常寒冷的海水和赤道印度洋中部850 hPa异常东风可能是持续东移的障碍（3）在负IOD年，东南印度洋异常暖水和赤道印度洋中部低层异常西风带可能导致MJO东移。
Based on multiple datasets,correlation and composite analyses,and case studies,this paper investigated the possible influences of Indian Ocean dipole(IOD) modes on the eastward propagation of intraseasonal oscillation in the tropical atmosphere.The results showed that(1) the 30～60-day outgoing longwave radiation(OLR) anomalies in the southeastern Indian Ocean and the 30～60-day 850 hPa zonal wind anomalies over the equatorial central Indian Ocean were significantly correlated with the IOD index;(2) during positive IOD years,the anomalously cold water in the southeastern Indian Ocean and the 850 hPa anomalous easterlies over the central equatorial Indian Ocean might act as barriers to the continuous eastward propagation of the intraseasonal convection,which interrupts the Madden-Julian oscillation(MJO) propagation in the eastern equatorial Indian Ocean and western Pacific;(3) during negative IOD years,the anomalously warm water in the southeastern Indian Ocean and the low-level anomalous westerlies over the central equatorial Indian Ocean may lead to the eastward movement of MJO.