气候变化领域集成服务门户(CCPortal): Multi-model assessment of the late-winter stratospheric response to El Niño and La Niña

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DOI	10.1007/s00382-021-05836-3
	Multi-model assessment of the late-winter stratospheric response to El Niño and La Niña
	Mezzina B.; Palmeiro F.M.; García-Serrano J.; Bladé I.; Batté L.; Benassi M.
发表日期	2021
ISSN	0930-7575
英文摘要	The impact of El Niño-Southern Oscillation (ENSO) on the late-winter extra-tropical stratosphere (January–March) is assessed in a multi-model framework. Three state-of-the-art atmospheric models are run with prescribed SST anomalies representative of a strong ENSO event, with symmetric patterns for El Niño and La Niña. The well-known temperature perturbation in the lower stratosphere during El Niño is captured by two models, in which the anomalous warming at polar latitudes is accompanied by a positive geopotential height anomaly that extends over the polar cap. In the third model, which shows a lack of temperature anomalies over the pole, the anomalous anticyclone is confined over Canada and does not expand to the polar cap. This anomalous center of action emerges from the large-scale tropospheric Rossby wave train forced by ENSO, and shrinking/stretching around the polar vortex is invoked to link it to the temperature response. No disagreement across models is found in the lower stratosphere for La Niña, whose teleconnection is opposite in sign but weaker. In the middle-upper stratosphere (above 50 hPa) the geopotential height anomalies project on a wavenumber-1 (WN1) pattern for both El Niño and, more weakly, La Niña, and show a westward tilt with height up to the stratopause. It is suggested that this WN1 pattern arises from the high-latitude lower-stratospheric anomalies, and that the ENSO teleconnection to the polar stratosphere can be interpreted in terms of upward propagation of the stationary Rossby wave train and quasi-geostrophic balance, instead of wave breaking. © 2021, The Author(s).
英文关键词	Atmospheric teleconnections; Climate modeling; ENSO; Stratosphere
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183419
作者单位	Barcelona Supercomputing Center (BSC), Barcelona, Spain; Group of Meteorology, Universitat de Barcelona (UB), Barcelona, Spain; CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France; Fondazione Centro Euro-Mediterraneo sui Cambiamenti Climatici (CMCC), Bologna, Italy
推荐引用方式 GB/T 7714	Mezzina B.,Palmeiro F.M.,García-Serrano J.,et al. Multi-model assessment of the late-winter stratospheric response to El Niño and La Niña[J],2021.
APA	Mezzina B.,Palmeiro F.M.,García-Serrano J.,Bladé I.,Batté L.,&Benassi M..(2021).Multi-model assessment of the late-winter stratospheric response to El Niño and La Niña.Climate Dynamics.
MLA	Mezzina B.,et al."Multi-model assessment of the late-winter stratospheric response to El Niño and La Niña".Climate Dynamics (2021).