气候变化领域集成服务门户(CCPortal): The Impact of Split and Displacement Sudden Stratospheric Warmings on the Troposphere

CCPortal

DOI	10.1029/2020JD033989
	The Impact of Split and Displacement Sudden Stratospheric Warmings on the Troposphere
	White I.P.; Garfinkel C.I.; Cohen J.; Jucker M.; Rao J.
发表日期	2021
ISSN	2169897X
卷号	126 期号:8
英文摘要	Although sudden stratospheric warmings (SSWs) can improve subseasonal-to-seasonal forecasts, it is unclear whether the two types of SSW - displacements and splits - have different near-surface effects. To examine the longer-term (i.e., multi-week lead) tropospheric response to displacements and splits, we utilize an intermediate-complexity model and impose wave-1 and wave-2 stratospheric heating perturbations spun-off from a control run. At longer lags, the tropospheric response is found to be insensitive to both the wavenumber and location of the imposed heating, in agreement with freely evolving displacements and splits identified in the control run. At shorter lags, however, large differences are found between displacements and splits in both the control run and the different wavenumber-forced events. In particular, in the control run, the free-running splits have an immediate barotropic response throughout the stratosphere and troposphere whereas displacements take 1–2 weeks before a near-surface response becomes evident. Interestingly, this barotropic response found during CTRL splits is not captured by the barotropically forced wave-2 events, indicating that the zonal-mean tropospheric circulation is somehow coupled with the generation of the wave-2 splits. It is also found that in the control run, displacements yield stronger Polar-Cap temperature anomalies than splits, yet both still yield similar magnitude tropospheric responses. Hence, the strength of the stratospheric warming is not the only governing factor in the surface response. Overall, SSW classification based on vortex morphology may be useful for subseasonal but not seasonal tropospheric prediction. © 2021. The Authors.
英文关键词	Idealized modeling; Northern Annular Mode; polar vortex; stratosphere-troposphere coupling; sudden stratospheric warmings; thermal forcing
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185313
作者单位	The Hebrew University of Jerusalem, Institute of Earth Sciences, Jerusalem, Israel; Atmospheric and Environmental Research Inc., Lexington, MA, United States; Massachusetts Institute of Technology, Cambridge, MA, United States; Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia
推荐引用方式 GB/T 7714	White I.P.,Garfinkel C.I.,Cohen J.,et al. The Impact of Split and Displacement Sudden Stratospheric Warmings on the Troposphere[J],2021,126(8).
APA	White I.P.,Garfinkel C.I.,Cohen J.,Jucker M.,&Rao J..(2021).The Impact of Split and Displacement Sudden Stratospheric Warmings on the Troposphere.Journal of Geophysical Research: Atmospheres,126(8).
MLA	White I.P.,et al."The Impact of Split and Displacement Sudden Stratospheric Warmings on the Troposphere".Journal of Geophysical Research: Atmospheres 126.8(2021).