Abrupt termination of Indian Ocean dipole events in response to intraseasonal disturbances
Abrupt termination of Indian Ocean dipole events in response to intraseasonal disturbances
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DOI：
10.1029/2004gl020842
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发表时间：
2004-10
影响因子：
5.2
通讯作者：
S. Rao;T. Yamagata
中科院分区：
文献类型：
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作者：
S. Rao;T. Yamagata
我们使用多个数据集研究了大气季节内扰动对印度洋偶极子（IOD）终止的作用。在除 1982 年和 1997 年事件外的所有 IOD 事件终止之前，我们观察到与赤道西风纬向风相关的显着 30-60 天的大气扰动。西风带激发异常下降的开尔文波，通过使东印度洋变暖而终止盆地范围内的耦合过程。 1982年和1997年的IOD事件与最强的厄尔尼诺事件同时发生；在那些年里，季节内扰动很弱。
We have investigated the role of atmospheric intraseasonal disturbances on termination of the Indian Ocean Dipole (IOD) using multiple datasets. We observed significant 30–60 day atmospheric disturbances associated with equatorial westerly zonal winds prior to termination of all IOD events except for the 1982 and 1997 events. The westerlies excite anomalous downwelling Kelvin waves that terminate the basin‐wide coupled processes by warming the eastern Indian Ocean. The 1982 and 1997 IOD events coincide with the strongest El Niño events; during those years the intraseasonal disturbances are weak.