Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1038/NGEO2329 |
The time-transgressive termination of the African Humid Period | |
Shanahan, Timothy M.1; McKay, Nicholas P.2; Hughen, Konrad A.3; Overpeck, Jonathan T.4; Otto-Bliesner, Bette5; Heil, Clifford W.6; King, John6; Scholz, Christopher A.7; Peck, John8 | |
通讯作者 | Shanahan, Timothy M. |
来源期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2015 |
卷号 | 8期号:2页码:140-144 |
英文摘要 | During the African Humid Period about 14,800 to 5,500 years ago, changes in incoming solar radiation during Northern Hemisphere summers led to the large-scale expansion and subsequent collapse of the African monsoon. Hydrologic reconstructions from arid North Africa show an abrupt onset and termination of the African Humid Period. These abrupt transitions have been invoked in arguments that the African monsoon responds rapidly to gradual forcing as a result of nonlinear land surface feedbacks. Here we present a reconstruction of precipitation in humid tropical West Africa for the past 20,000 years using the hydrogen isotope composition of leaf waxes preserved in sediments from Lake Bosumtwi, Ghana. We show that over much of tropical and subtropical Africa the monsoon responded synchronously and predictably to glacial reorganizations of overturning circulation in the Atlantic Ocean, but the response to the relatively weaker radiative forcing during the African Humid Period was more spatially and temporally complex. A synthesis of hydrologic reconstructions from across Africa shows that the termination of the African Humid Period was locally abrupt, but occurred progressively later at lower latitudes. We propose that this time-transgressive termination of the African Humid Period reflects declining rainfall intensity induced directly by decreasing summer insolation as well as the gradual southward migration of the tropical rainbelt that occurred during this interval. |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000349354200019 |
WOS关键词 | NORTHERN AFRICA ; GLACIAL-MAXIMUM ; CLIMATE CHANGES ; 20-1ST CENTURY ; ASIAN MONSOON ; LAKE BOSUMTWI ; ABRUPT CHANGE ; MIDHOLOCENE ; SIMULATION ; VEGETATION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/189345 |
作者单位 | 1.Univ Texas Austin, Dept Geol Sci, Austin, TX 78712 USA; 2.No Arizona Univ, Sch Earth Sci & Environm Sustainabil, Flagstaff, AZ 86011 USA; 3.Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA; 4.Univ Arizona, Inst Environm, Tucson, AZ 85721 USA; 5.Natl Ctr Atmospher Res, Boulder, CO 80305 USA; 6.Univ Rhode Isl, Grad Sch Oceanog, Narragansett, RI 02882 USA; 7.Syracuse Univ, Dept Earth Sci, Heroy Geol Lab, Syracuse, NY 13244 USA; 8.Univ Akron, Dept Earth Sci, Akron, OH 44325 USA |
推荐引用方式 GB/T 7714 | Shanahan, Timothy M.,McKay, Nicholas P.,Hughen, Konrad A.,et al. The time-transgressive termination of the African Humid Period[J]. University of Arizona,2015,8(2):140-144. |
APA | Shanahan, Timothy M..,McKay, Nicholas P..,Hughen, Konrad A..,Overpeck, Jonathan T..,Otto-Bliesner, Bette.,...&Peck, John.(2015).The time-transgressive termination of the African Humid Period.NATURE GEOSCIENCE,8(2),140-144. |
MLA | Shanahan, Timothy M.,et al."The time-transgressive termination of the African Humid Period".NATURE GEOSCIENCE 8.2(2015):140-144. |
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