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

文献类型：期刊论文

作者Sha, Lijuan6; Brahim, Yassine Ait6; Wassenburg, Jasper A.1; Yin, Jianjun7; Peros, Matthew4; Cruz, Francisco W.5; Cai, Yanjun3,6; Li, Hanying6; Du, Wenjing6; Zhang, Haiwei6
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2019-12-16
卷号46期号:23页码:14093-14102
ISSN号0094-8276
关键词African Humid Period speleothem delta O-18 records Holocene abrupt climate change West African summer monsoon
DOI10.1029/2019GL084879
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.
WOS关键词ATLANTIC OSCILLATION ; HOLOCENE CLIMATE ; SAHARA ; PRECIPITATION ; OXYGEN ; TERMINATION ; VARIABILITY ; EVOLUTION ; HYDROCLIMATE ; MECHANISMS
资助项目NSFC[41888101] ; NSFC[41472140] ; NSFC[41731174] ; NSFC[41561144003] ; U.S. NSF[1702816] ; Postdoctoral Science Foundation of China[2018M640971]
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
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.Max Planck Inst Chem, Climate Geochem Dept, Mainz, Germany
2.Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA
3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Shaanxi, Peoples R China
4.Bishops Univ, Dept Environm & Geog, Sherbrooke, PQ, Canada
5.Univ Sao Paulo, Inst Geociencias, Sao Paulo, SP, Brazil
6.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian, Shaanxi, Peoples R China
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.

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来源：地球环境研究所

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