How Far North Did the African Monsoon Fringe Expand During the African Humid Period? Insights From Southwest Moroccan Speleothems

doi:10.1029/2019GL084879

	How Far North Did the African Monsoon Fringe Expand During the African Humid Period? Insights From Southwest Moroccan Speleothems
	Sha, Lijuan 5; Brahim, Yassine Ait 5; Wassenburg, Jasper A.6; Yin, Jianjun 7; Peros, Matthew 1; Cruz, Francisco W.2; Cai, Yanjun 3,5; Li, Hanying 5; Du, Wenjing 5; Zhang, Haiwei 5
刊名	GEOPHYSICAL RESEARCH LETTERS
	2019-12-16
卷号	46 期号:23 页码:14093-14102
关键词	African Humid Period speleothem delta O-18 records Holocene abrupt climate change West African summer monsoon
ISSN号	0094-8276
DOI	10.1029/2019GL084879
通讯作者	Cheng, Hai(cheng021@xjtu.edu.cn)
英文摘要	We present new high-resolution oxygen isotope (delta O-18) records from three NW African speleothems located at 31 degrees N. The present-day rainfall patterns at 31 degrees N in NW Africa are linked to negative winter North Atlantic Oscillation phases. However, on multimillennial time scales, our delta O-18 records, together with other hydroclimate records, provide new evidence of humid conditions during the mid-Holocene, a period that was presumably characterized by arid climate. Thus, the apparent increase in moisture during the mid-Holocene is interpreted better as an increase in summer rainfall. This is most likely linked to the expansion of the West African summer monsoon fringe during the African Humid Period, which terminated in our record abruptly around 4 Kyr BP. The temporospatial difference with speleothem records from N Morocco suggests that the High-Atlas Mountains might have been a topographic barrier to further expansion of the West African summer monsoon fringe into higher latitudes. Plain Language Summary The Holocene African Humid Period in North Africa, characterized by the expansion of vegetation into the Green Sahara, has been linked to the intensification of the West African summer monsoon (WASM). However, the temporospatial pattern of the African Humid Period, especially the northernmost expansion of the WASM, remain a matter of controversy, largely owing to the lack of precisely dated and high-resolution paleoclimatic records. This study presents new highresolution paleoclimate data based on speleothem oxygen isotope records from a key site at 31 degrees N in NW Africa. Our data suggest that the WASM expanded to 31 degrees N in NW Africa during the mid-Holocene and terminated abruptly at 4 Kyr BP.
资助项目	NSFC[41888101] ; NSFC[41472140] ; NSFC[41731174] ; NSFC[41561144003] ; U.S. NSF[1702816] ; Postdoctoral Science Foundation of China[2018M640971]
WOS关键词	ATLANTIC OSCILLATION ; HOLOCENE CLIMATE ; SAHARA ; PRECIPITATION ; OXYGEN ; TERMINATION ; VARIABILITY ; EVOLUTION ; HYDROCLIMATE ; MECHANISMS
WOS研究方向	Geology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000502462500001
资助机构	NSFC ; U.S. NSF ; Postdoctoral Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/13051]
专题	地球环境研究所_现代环境研究室
通讯作者	Cheng, Hai
作者单位	1.Bishops Univ, Dept Environm & Geog, Sherbrooke, PQ, Canada 2.Univ Sao Paulo, Inst Geociencias, Sao Paulo, SP, Brazil 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Shaanxi, Peoples R China 4.Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA 5.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian, Shaanxi, Peoples R China 6.Max Planck Inst Chem, Climate Geochem Dept, Mainz, Germany 7.Chinese Acad Geol Sci, Inst Karst Geol, Key Lab Karst Dynam, MNR & Guangxi, Guilin, Peoples R China
推荐引用方式 GB/T 7714	Sha, Lijuan,Brahim, Yassine Ait,Wassenburg, Jasper A.,et al. How Far North Did the African Monsoon Fringe Expand During the African Humid Period? Insights From Southwest Moroccan Speleothems[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(23):14093-14102.
APA	Sha, Lijuan.,Brahim, Yassine Ait.,Wassenburg, Jasper A..,Yin, Jianjun.,Peros, Matthew.,...&Cheng, Hai.(2019).How Far North Did the African Monsoon Fringe Expand During the African Humid Period? Insights From Southwest Moroccan Speleothems.GEOPHYSICAL RESEARCH LETTERS,46(23),14093-14102.
MLA	Sha, Lijuan,et al."How Far North Did the African Monsoon Fringe Expand During the African Humid Period? Insights From Southwest Moroccan Speleothems".GEOPHYSICAL RESEARCH LETTERS 46.23(2019):14093-14102.