气候变化领域集成服务门户(CCPortal): Understanding the variation of stratosphere–troposphere coupling during stratospheric northern annular mode events from a mass circulation perspective

CCPortal

DOI	10.1007/s00382-019-04675-7
	Understanding the variation of stratosphere–troposphere coupling during stratospheric northern annular mode events from a mass circulation perspective
	Yu Y.; Ren R.
发表日期	2019
ISSN	0930-7575
起始页码	5141
结束页码	5164
卷号	53 期号:2020-09-10
英文摘要	We revisit the various stratosphere–troposphere coupling relation from the perspective of the meridional mass circulation. We constructed 10-hPa northern annular mode (NAM) phase composites to show the typical spatiotemporal evolution of circulation anomalies during the NAM’s life cycle. Our results indicate that there is large case-to-case difference in the temporal evolution and vertical profile of polar temperature anomalies during NAM events, which shows no strong dependence on the intensity and duration of NAM events, but agrees well with the variations of the three branches of mass circulation at 60°N: the stratospheric poleward warm air branch (ST), the poleward warm air branch in the upper troposphere (WB), and the equatorward cold air branch in the lower troposphere (CB). Such correspondence is due to the dynamic heating and cooling anomalies associated with the redistribution of air masses by the anomalous meridional mass circulation in different isentropic layers. The various relationship among the three mass circulation branches is attributed to anomalous wave activities. The amplitude and westward tilt of waves are always stronger (weaker) throughout the stratosphere before (after) the peak time of negative NAM events, leading to a stronger (weaker) ST before (after) the peak time. Variations in WB and CB are mostly dependent on wave variabilities in the mid- to lower troposphere, leading to variations in the timing of in- or out-of-phase coupling of the ST with the WB and CB, and thus various thermostructure during NAM events. At a later stage of the negative NAM events when the polar temperature becomes colder and the polar jet recovers, the weakened baroclinic instability in the lower stratosphere provides favorable conditions for the strengthening of the WB and CB if wave activities strengthen in the troposphere during that period. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	anomaly; Arctic Oscillation; cold air; meridional circulation; spatiotemporal analysis; stratosphere-troposphere interaction; temperature anomaly
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/145925
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Joint International Research Laboratory of Climate and Environment Change (ILCEC), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, 210044, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
推荐引用方式 GB/T 7714	Yu Y.,Ren R.. Understanding the variation of stratosphere–troposphere coupling during stratospheric northern annular mode events from a mass circulation perspective[J],2019,53(2020-09-10).
APA	Yu Y.,&Ren R..(2019).Understanding the variation of stratosphere–troposphere coupling during stratospheric northern annular mode events from a mass circulation perspective.Climate Dynamics,53(2020-09-10).
MLA	Yu Y.,et al."Understanding the variation of stratosphere–troposphere coupling during stratospheric northern annular mode events from a mass circulation perspective".Climate Dynamics 53.2020-09-10(2019).