Mode shift in the Indian Ocean climate under global warming stress
Mode shift in the Indian Ocean climate under global warming stress
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DOI：
10.1029/2009gl040590
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发表时间：
2009-12-08
影响因子：
5.2
通讯作者：
Yamagata, Toshio
中科院分区：
文献类型：
--
作者：
Nakamura, Nobuko;Kayanne, Hajime;Yamagata, Toshio
肯尼亚115年的珊瑚记录被发现保存了东非降雨异常的历史，与全球变暖引起的印度洋偶极子（IOD）变化有关。珊瑚IOD指数在20世纪早期表现出明显的年代际周期性。1924年以前，这种低频IOD发生的频率较高，1960年以来，大多数准两年发生一次，范围从18个月到3年。模式转变还与印度夏季季风降雨的耦合加剧同时发生。我们认为，西印度洋的变暖，削弱和取代厄尔尼诺/南方涛动效应在印度洋，推动了观察到的转变。引文：中村，N.，H. Kayanne，H. Iijima，T. R. McClanahan，S. K. Behera和T. Yamagata（2009），全球变暖压力下印度洋气候的模式转变，Geophys。保留信函：36，L23708，doi：10.1029/2009GL040590。
A 115-year coral record from Kenya has been found to preserve the history of rainfall anomalies in East Africa in relation to global warming-induced Indian Ocean Dipole (IOD) variability. The coral IOD index demonstrates a dominantly decadal periodicity in the early part of the 20th century. This low-frequency IOD occurred more frequently before 1924 with mostly quasi-biennial ranging from 18 months to 3 years events since 1960. The mode shift has also coincided with an intensified coupling with Indian summer monsoon rainfall. We suggest that a warming of the western Indian Ocean, which has attenuated and replaced the El Nino/Southern Oscillation effect over the Indian Ocean, has driven the observed shift. Citation: Nakamura, N., H. Kayanne, H. Iijima, T. R. McClanahan, S. K. Behera, and T. Yamagata (2009), Mode shift in the Indian Ocean climate under global warming stress, Geophys. Res. Lett., 36, L23708, doi: 10.1029/2009GL040590.