The impact of the AMO on multidecadal ENSO variability

被引：104
作者：
Levine, Aaron F. Z. [1 ]
McPhaden, Michael J. [1 ]
Frierson, Dargan M. W. [2 ]
机构：
[1] NOAA, PMEL, Seattle, WA 98115 USA
[2] Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2017年 / 44卷 / 08期
关键词：
ENSO; Atlantic Multidecadal Oscillation; multidecadal variability; tropical Pacific annual cycle; TROPICAL PACIFIC; EL-NINO; ATLANTIC; CIRCULATION; OSCILLATION; MODULATION;
D O I：
10.1002/2017GL072524
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Multidecadal shifts in El Nino-Southern Oscillation (ENSO) variability have been observed, but it is unclear if this variability is just a random variation in the ENSO cycle or whether it is forced by other modes of climate variability. Here we show a strong influence of the Atlantic on the multidecadal variability of ENSO. The Atlantic Multidecadal Oscillation (AMO) is the dominant mode of multidecadal sea surface temperature (SST) variability in the Atlantic Ocean. Changes in AMO-related tropical Atlantic SSTs are known to force changes in the Walker circulation in the tropical Pacific Ocean. Using conceptual and coupled model experiments, we show that these changes to the Walker circulation modify ENSO stability on both annual and multidecadal time scales leading to a distinctive pattern of multidecadal ENSO variability that we find in observations and ocean reanalyses.
引用
收藏
页码：3877 / 3886
页数：10
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