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首页> 外文期刊>Science Advances >Eastward shift and extension of ENSO-induced tropical precipitation anomalies under global warming
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Eastward shift and extension of ENSO-induced tropical precipitation anomalies under global warming

机译：全球变暖下的东移和恩科诱导的热带降水异常的延伸

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During El Ni?o 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 Ni?o–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 Ni?o–induced tropical precipitation anomalies suggest that, under global warming, El Ni?o events decay faster after their peak phase, thus shortening their duration.
机译：在EL NI？O事件期间，在赤道中央东部太平洋上发生了增加的降水，相应于增强的对流加热，通过令人兴奋的大气连接来调节全球气候。这些降水异常预计会因全球变暖而向东转动并延伸。我们表明，这一预测的变化是由底层EL NI的子化跨度（SST）异常的子午线缩小引起的，导致SST异常的子午线的增强，加强边界层水分融合赤道东太平洋，增强局部阳性降水异常。这些异常的东移和延伸也加强了热带西部北太平洋的反向负降水异常，加强了低于平均湿润焓的赤道平流。 EL NI的变化诱发的热带降水异常表明，在全球变暖下，EL NI？O事件在其峰值阶段后更快地衰减，从而缩短了它们的持续时间。

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