气候变化领域集成服务门户(CCPortal): Impact of sea ice reduction in the barents and kara seas on the variation of the East Asian trough in late winter

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DOI	10.1175/JCLI-D-20-0205.1
	Impact of sea ice reduction in the barents and kara seas on the variation of the East Asian trough in late winter
	Xu M.; Tian W.; Zhang J.; Wang T.; Qie K.
发表日期	2021
ISSN	0894-8755
起始页码	1081
结束页码	1097
卷号	34 期号:3
英文摘要	Using the European Centre for Medium-Range Weather Forecasts (ECMWF) interim reanalysis (ERA-Interim) dataset and the Specified Chemistry Whole Atmosphere Community Climate Model (WACCM-SC), the impacts of sea ice reduction in the Barents-Kara Seas (BKS) on the East Asian trough (EAT) in late winter are investigated. Results from both reanalysis data and simulations show that the BKS sea ice reduction leads to a deepened EAT in late winter, especially in February, while the EAT axis tilt is not sensitive to the BKS sea ice reduction. Further analysis shows that the BKS sea ice reduction influences the EAT through the tropospheric and stratospheric pathways. For the tropospheric pathway, the results from a linearized barotropic model and Rossby wave ray tracing model reveal that long Rossby wave trains stimulated by the BKS sea ice loss propagate downstream to the North Pacific, strengthening the EAT. For the stratospheric pathway, the upward planetary waves enhanced by the BKS sea ice reduction shift the subpolar westerlies near the tropopause southward. With the critical lines displaced equatorward, the poleward transient eddies break at lower latitudes, shifting the eddy momentum deposit throughout the troposphere equatorward. Tropospheric westerlies maintained by eddy momentum deposit are also shifted southward, inducing the cyclonic anomalies over the North Pacific and deepening the EAT in late winter. Nudging experiments show that the tropospheric pathway only contributes to around 29.7% of the deepening of the EAT in February induced by the BKS sea ice loss, while the remaining 70.3% is caused by stratosphere-troposphere coupling. © 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	Atmospheric chemistry; Climate models; Deposits; Mechanical waves; Troposphere; Weather forecasting; Barotropic models; Critical lines; European centre for medium-range weather forecasts; North Pacific; Planetary Waves; Ray-tracing model; Stratosphere-troposphere coupling; Whole atmosphere community climate models; Sea ice
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/170928
作者单位	Key Laboratory for Semi-Arid Climate Change, Ministry of Education, College of Atmospheric Sciences, Lanzhou University, China
推荐引用方式 GB/T 7714	Xu M.,Tian W.,Zhang J.,et al. Impact of sea ice reduction in the barents and kara seas on the variation of the East Asian trough in late winter[J],2021,34(3).
APA	Xu M.,Tian W.,Zhang J.,Wang T.,&Qie K..(2021).Impact of sea ice reduction in the barents and kara seas on the variation of the East Asian trough in late winter.Journal of Climate,34(3).
MLA	Xu M.,et al."Impact of sea ice reduction in the barents and kara seas on the variation of the East Asian trough in late winter".Journal of Climate 34.3(2021).