气候变化领域集成服务门户(CCPortal): The poleward shift of South Atlantic Convergence Zone in recent decades

CCPortal

DOI	10.1007/s00382-018-4277-1
	The poleward shift of South Atlantic Convergence Zone in recent decades
	Zilli M.T.; Carvalho L.M.V.; Lintner B.R.
发表日期	2019
ISSN	0930-7575
起始页码	2545
结束页码	2563
卷号	52 期号:2020-05-06
英文摘要	During austral summer (December–January–February or DJF), intense precipitation over central-eastern Brazil is modulated by the South American Monsoon System and the South Atlantic Convergence Zone (SACZ). Previous studies identified spatial variability in precipitation trends over this region, suggestive of a poleward shift of the SACZ in recent years. To identify underlying mechanisms associated with changes in the precipitation intensity and position of the SACZ, decadal averages of observed precipitation and the mean state of the atmosphere and ocean during three different periods from 1979 to 2014 are compared. Results show evidence of decreasing (increasing) average daily precipitation along the equatorward (poleward) margin of the climatological SACZ, likely related to a poleward shift of the convergence zone. Precipitation reduction along the equatorward margin of the SACZ is associated with weakening of the poleward winds along the eastern Brazilian coast and drying of low-to-mid troposphere (700 hPa) over the tropical Atlantic. These changes in circulation and moisture are likely related to the poleward expansion of the South Atlantic Subtropical High. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Convective margin; Decadal variability; Precipitation; South America; South Atlantic Convergence Zone
语种	英语
scopus关键词	atmospheric circulation; atmospheric convection; decadal variation; precipitation assessment; spatiotemporal analysis; troposphere; Atlantic Ocean; Atlantic Ocean (South); South America
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/146503
作者单位	Department of Geography, University of California, 1832 Ellison Hall, Santa Barbara, CA 93106-4060, United States; Earth Research Institute, University of California, Santa Barbara, CA, United States; Department of Environmental Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States
推荐引用方式 GB/T 7714	Zilli M.T.,Carvalho L.M.V.,Lintner B.R.. The poleward shift of South Atlantic Convergence Zone in recent decades[J],2019,52(2020-05-06).
APA	Zilli M.T.,Carvalho L.M.V.,&Lintner B.R..(2019).The poleward shift of South Atlantic Convergence Zone in recent decades.Climate Dynamics,52(2020-05-06).
MLA	Zilli M.T.,et al."The poleward shift of South Atlantic Convergence Zone in recent decades".Climate Dynamics 52.2020-05-06(2019).