气候变化领域集成服务门户(CCPortal): The generic nature of the tropospheric response to sudden stratospheric warmings

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DOI	10.1175/JCLI-D-19-0697.1
	The generic nature of the tropospheric response to sudden stratospheric warmings
	White L.P.; Garfinkel C.I.; Gerber E.P.; Jucker M.; Hitchcock P.; Rao J.
发表日期	2020
ISSN	0894-8755
起始页码	5589
结束页码	5610
卷号	33 期号:13
英文摘要	The tropospheric response to midwinter sudden stratospheric warmings (SSWs) is examined using an idealized model. SSW events are triggered by imposing high-latitude stratospheric heating perturbations of varying magnitude for only a few days, spun off from a free-running control integration (CTRL). The evolution of the thermally triggered SSWs is then compared with naturally occurring SSWs identified in CTRL. By applying a heating perturbation, with no modification to the momentum budget, it is possible to isolate the tropospheric response directly attributable to a change in the stratospheric polar vortex, independent of any planetary wave momentum torques involved in the initiation of an SSW. Zonal-wind anomalies associated with the thermally triggered SSWs first propagate downward to the high-latitude troposphere after ;2 weeks, before migrating equatorward and stalling atmidlatitudes,where they straddle the near-surface jet. After;3weeks, the circulation and eddy fluxes associated with thermally triggered SSWs evolve very similarly to SSWs in CTRL, despite the lack of initial planetary wave driving. This suggests that at longer lags, the tropospheric response to SSWs is generic and it is found to be linearly governed by the strength of the lower-stratospheric warming, whereas at shorter lags, the initial formation of the SSWpotentially plays a large role in the downward coupling. In agreement with previous studies, synoptic waves are found to play a key role in the persistent tropospheric jet shift at long lags. Synoptic waves appear to respond to the enhanced midlatitude baroclinicity associated with the tropospheric jet shift, and preferentially propagate poleward in an apparent positive feedback with changes in the high-latitude refractive index. © 2020 American Meteorological Society. All rights reserved.
英文关键词	Budget control; Feedback; Refractive index; Generic nature; Idealized models; Momentum budget; Naturally occurring; Planetary Waves; Running control; Stratospheric polar vortex; Stratospheric warmings; Troposphere; jet; planetary wave; polar vortex; stratosphere; torque; troposphere; warming
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171236
作者单位	Institute of Earth Sciences, Edmond J. Safra Campus, Hebrew University of Jerusalem, Jerusalem, Israel; Courant Institute of Mathematical Sciences, New York University, New York, NY, United States; Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; Institute of Earth Sciences, Edmond J. Safra Campus, Hebrew University of Jerusalem, Jerusalem, Israel
推荐引用方式 GB/T 7714	White L.P.,Garfinkel C.I.,Gerber E.P.,et al. The generic nature of the tropospheric response to sudden stratospheric warmings[J],2020,33(13).
APA	White L.P.,Garfinkel C.I.,Gerber E.P.,Jucker M.,Hitchcock P.,&Rao J..(2020).The generic nature of the tropospheric response to sudden stratospheric warmings.Journal of Climate,33(13).
MLA	White L.P.,et al."The generic nature of the tropospheric response to sudden stratospheric warmings".Journal of Climate 33.13(2020).