期刊
SCIENCE ADVANCES
卷 6, 期 2, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aax4177
关键词
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资金
- NSFC [41630423, 41661144009]
- National Key Research and Development Program of China [2017YFA0603802, 2018YFA0606301]
- GOTHAM International Cooperative Project
- NOAA [NA18OAR4310298]
- UK-China Research and Innovation Partnership Fund through the Met Office Climate Science for Service Partnership (CSSP) China as part of the Newton Fund
- Strategic Priority Research Programme of Chinese Academy of Sciences [XDA20060102]
- NSF [AGS-1565653]
- NERC [NE/S004645/1] Funding Source: UKRI
During El Nino events, increased precipitation occurs over the equatorial central eastern Pacific, corresponding to enhanced convective heating that modulates global climate by exciting atmospheric teleconnections. These precipitation anomalies are projected to shift and extend eastward in response to global warming. We show that this predicted change is caused by narrowing of the meridional span of the underlying El Nino-related sea surface temperature (SST) anomalies that leads to intensification of the meridional gradient of the SST anomalies, strengthening boundary-layer moisture convergence over the equatorial eastern Pacific, and enhancing local positive precipitation anomalies. The eastward shift and extension of these anomalies also intensify and extend eastward negative precipitation anomalies over the tropical western North Pacific, by strengthening equatorward advection of low mean moist enthalpy. Changes in El Nino-induced tropical precipitation anomalies suggest that, under global warming, El Nino events decay faster after their peak phase, thus shortening their duration.
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