气候变化领域集成服务门户(CCPortal): Transient extratropical response to solar ultraviolet radiation in the Northern Hemisphere winter

CCPortal

DOI	10.1175/JCLI-D-20-0655.1
	Transient extratropical response to solar ultraviolet radiation in the Northern Hemisphere winter
	Givon Y.; Garfinkel C.I.; White I.
发表日期	2021
ISSN	08948755
起始页码	3367
结束页码	3383
卷号	34 期号:9
英文摘要	An intermediate complexity general circulation model is used to investigate the transient response of the NH winter stratosphere to modulated ultraviolet (UV) radiation by imposing a stepwise, deliberately exaggerated UV perturbation and analyzing the lagged response. Enhanced UV radiation is accompanied by an immediate warming of the tropical upper stratosphere. The warming then spreads into the winter subtropics due to an accelerated Brewer-Dobson circulation in the tropical upper stratosphere. The poleward meridional velocity in the subtropics leads to an increase in zonal wind in midlatitudes between 208 and 508N due to Coriolis torque. The increase in midlatitude zonal wind is accompanied by a dipole in Eliassen-Palm flux convergence, with decreased convergence near the winter pole and increased convergence in midlatitudes (where winds are strengthening due to the Coriolis torque); this dipole subsequently extends the anomalous westerlies to subpolar latitudes within the first 10 days. The initial radiatively driven acceleration of the Brewer-Dobson circulation due to enhanced shortwave absorption is replaced in the subpolar winter stratosphere by a wave-driven deceleration of the Brewer-Dobson circulation, and after a month the wave-driven deceleration of the Brewer-Dobson circulation encompasses most of the winter stratosphere. Approximately a month after UV is first modified, a significant poleward jet shift is evident in the troposphere. The results of this study may have implications for the observed stratospheric and tropospheric responses to solar variability associated with the 27-day solar rotation period, and also to solar variability on longer time scales. © 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Solar cycle; Stratosphere-troposphere coupling; Stratospheric circulation
语种	英语
scopus关键词	Tropics; Troposphere; Ultraviolet radiation; Brewer-Dobson circulation; Eliassen-Palm flux; General circulation model; Intermediate complexity; Meridional velocities; Northern Hemispheres; Solar ultraviolet radiation; Solar variability; Transient analysis
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/178617
作者单位	The Hebrew University of Jerusalem, Institute of Earth Sciences, Jerusalem, Israel
推荐引用方式 GB/T 7714	Givon Y.,Garfinkel C.I.,White I.. Transient extratropical response to solar ultraviolet radiation in the Northern Hemisphere winter[J],2021,34(9).
APA	Givon Y.,Garfinkel C.I.,&White I..(2021).Transient extratropical response to solar ultraviolet radiation in the Northern Hemisphere winter.Journal of Climate,34(9).
MLA	Givon Y.,et al."Transient extratropical response to solar ultraviolet radiation in the Northern Hemisphere winter".Journal of Climate 34.9(2021).