干旱区生态环境知识资源中心(Arid): Cutoff lows off the coast of the Atacama Desert under present day conditions and in the Last Glacial Maximum

Arid

DOI	10.1016/j.gloplacha.2019.102983
	Cutoff lows off the coast of the Atacama Desert under present day conditions and in the Last Glacial Maximum
	Reyers, Mark; Shao, Yaping
通讯作者	Reyers, Mark
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2019
卷号	181
英文摘要	Cutoff lows (COLs) over the subtropical Southeast Pacific may have a distinct impact on the local climate in Northern Chile and in the Atacama Desert. They are associated with generally wetter conditions and also influence the thermally driven wind regimes. In this study, mid-tropospheric COLs in the specific region off the coast of the Atacama Desert north of 30 degrees S are analysed for austral winter (April September). For the recent past climate slightly more than four COLs per winter on average are detected in ERA-Interim reanalysis (1979-2015). From composite analysis we found that a split jet over the Eastern South Pacific is beneficial for the formation of COLs. Depending on the characteristics of the southern jet streak, wave breaking processes are involved, and the majority of the COL events is associated to anti-cyclonic wave breaking equator-wards. More COLs occur in the Last Glacial Maximum (LGM) compared to present day conditions in two models (MPI-ESM-P and CCSM4) of the Paleoclimate Modeling Intercomparison Project (3rd phase; PMIP3). In both models the processes being involved in the COL formation are depicted realistically. The increasing number of winter COLs coincides with a shift of upper-level zonal winds, which facilitates the formation of the split jet structure over the Eastern South Pacific: The non-uniform global cooling during the LGM due to polar amplification induce a decrease of the subtropical jet and a speed up of upper-level zonal winds in the mid-latitudes of the Southern Hemisphere, and these shifts are particularly strong in the South Pacific region west of South America.
英文关键词	Cutoff lows Atacama Desert Wave breaking Split jet Last Glacial Maximum
类型	Article
语种	英语
国家	Germany
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000488666200018
WOS关键词	ROSSBY-WAVE-BREAKING ; SOUTHERN-HEMISPHERE ; VARIABILITY ; CIRCULATION ; PRECIPITATION ; CLIMATOLOGY ; IMPACT ; CHILE
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216076
作者单位	Univ Cologne, Inst Geophys & Meteorol, Pohligstr 3, D-50969 Cologne, Germany
推荐引用方式 GB/T 7714	Reyers, Mark,Shao, Yaping. Cutoff lows off the coast of the Atacama Desert under present day conditions and in the Last Glacial Maximum[J],2019,181.
APA	Reyers, Mark,&Shao, Yaping.(2019).Cutoff lows off the coast of the Atacama Desert under present day conditions and in the Last Glacial Maximum.GLOBAL AND PLANETARY CHANGE,181.
MLA	Reyers, Mark,et al."Cutoff lows off the coast of the Atacama Desert under present day conditions and in the Last Glacial Maximum".GLOBAL AND PLANETARY CHANGE 181(2019).