气候变化领域集成服务门户(CCPortal): Exploring the link between austral stratospheric polar vortex anomalies and surface climate in chemistry-climate models

CCPortal

DOI	10.5194/acp-22-13915-2022
	Exploring the link between austral stratospheric polar vortex anomalies and surface climate in chemistry-climate models
	Bergner, Nora; Friedel, Marina; Domeisen, Daniela I., V; Waugh, Darryn; Chiodo, Gabriel
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	13915
结束页码	13934
卷号	22 期号:21 页码:20
英文摘要	Extreme events in the stratospheric polar vortex can lead to changes in the tropospheric circulation and impact the surface climate on a wide range of timescales. The austral stratospheric vortex shows its largest variability in spring, and a weakened polar vortex is associated with changes in the spring to summer surface climate, including hot and dry extremes in Australia. However, the robustness and extent of the connection between polar vortex strength and surface climate on interannual timescales remain unclear. We assess this relationship by using reanalysis data and time-slice simulations from two chemistry-climate models (CCMs), building on previous work that is mainly based on observations. The CCMs show a similar downward propagation of anomalies in the polar vortex strength to the reanalysis data: a weak polar vortex is on average followed by a negative tropospheric Southern Annular Mode (SAM) in spring to summer, while a strong polar vortex is on average followed by a positive SAM. The signature in the surface climate following polar vortex weakenings is characterized by high surface pressure and warm temperature anomalies over Antarctica, the region where surface signals are most robust across all model and observational datasets. However, the tropospheric SAM response in the two CCMs considered is inconsistent with observations. In one CCM, the SAM is more negative compared to the reanalysis after weak polar vortex events, whereas in the other CCM, it is less negative. In addition, neither model reproduces all the regional changes in midlatitudes, such as the warm and dry anomalies over Australia. We find that these inconsistencies are linked to model biases in the basic state, such as the latitude of the eddy-driven jet and the persistence of the SAM. These results are largely corroborated by models that participated in the Chemistry-Climate Model Initiative (CCMI). Furthermore, bootstrapping of the data reveals sizable uncertainty in the magnitude of the surface signals in both models and observations due to internal variability. Our results demonstrate that anomalies of the austral stratospheric vortex have significant impacts on surface climate, although the ability of models to capture regional effects across the Southern Hemisphere is limited by biases in their representation of the stratospheric and tropospheric circulation.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000877090400001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273880
作者单位	Swiss Federal Institutes of Technology Domain; ETH Zurich; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; University of Lausanne; Johns Hopkins University
推荐引用方式 GB/T 7714	Bergner, Nora,Friedel, Marina,Domeisen, Daniela I., V,et al. Exploring the link between austral stratospheric polar vortex anomalies and surface climate in chemistry-climate models[J],2022,22(21):20.
APA	Bergner, Nora,Friedel, Marina,Domeisen, Daniela I., V,Waugh, Darryn,&Chiodo, Gabriel.(2022).Exploring the link between austral stratospheric polar vortex anomalies and surface climate in chemistry-climate models.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(21),20.
MLA	Bergner, Nora,et al."Exploring the link between austral stratospheric polar vortex anomalies and surface climate in chemistry-climate models".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.21(2022):20.