Timing and causes of North African wet phases during the last glacial period and implications for modern human migration.
Timing and causes of North African wet phases during the last glacial period and implications for modern human migration.
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DOI：
10.1038/srep36367
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发表时间：
2016-11-03
影响因子：
4.6
通讯作者：
Moseley GE
中科院分区：
文献类型：
--
作者：
Hoffmann DL;Rogerson M;Spötl C;Luetscher M;Vance D;Osborne AH;Fello NM;Moseley GE
我们提出了第一个洞穴沉积物衍生的中北非降雨记录的末次冰期。记录表明，在65-61 ka、52.5-50.5 ka和37.5-33 ka有三个主要的湿润期，它们导致了岁差的极大值和岁差的极小值。我们发现额外的小湿的插曲，与格陵兰岛interstadials同步。我们的研究结果表明，亚热带水文被迫由轨道周期性和北大西洋水分来源。记录显示，在大约70 ka前撒哈拉湿润期结束后，北非继续间歇性地获得比今天多得多的降雨，为现代人类的扩张创造了有利的环境条件。尼安德特人和现代人的相遇和随后的混合-根据遗传学证据，被认为发生在60到50 ka之间-与52.5到50.5 ka之间的湿相同步发生。根据遗传学证据，现代人类向欧亚大陆的扩散开始于不到55万年前。这可能是由50.5 ka后在北非盛行的干燥条件引发的。现代人类从欧亚大陆到北非的迁移逆转的时间被认为是与37.5和33 ka之间的湿润期相一致的。
We present the first speleothem-derived central North Africa rainfall record for the last glacial period. The record reveals three main wet periods at 65-61 ka, 52.5-50.5 ka and 37.5-33 ka that lead obliquity maxima and precession minima. We find additional minor wet episodes that are synchronous with Greenland interstadials. Our results demonstrate that sub-tropical hydrology is forced by both orbital cyclicity and North Atlantic moisture sources. The record shows that after the end of a Saharan wet phase around 70 ka ago, North Africa continued to intermittently receive substantially more rainfall than today, resulting in favourable environmental conditions for modern human expansion. The encounter and subsequent mixture of Neanderthals and modern humans – which, on genetic evidence, is considered to have occurred between 60 and 50 ka – occurred synchronously with the wet phase between 52.5 and 50.5 ka. Based on genetic evidence the dispersal of modern humans into Eurasia started less than 55 ka ago. This may have been initiated by dry conditions that prevailed in North Africa after 50.5 ka. The timing of a migration reversal of modern humans from Eurasia into North Africa is suggested to be coincident with the wet period between 37.5 and 33 ka.
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影响因子：
3.7
作者：
Coulthard TJ;Ramirez JA;Barton N;Rogerson M;Brücher T
通讯作者：
Brücher T
影响因子：
2.3
作者：
BarMatthews, M;Ayalon, A;Kaufman, A
通讯作者：
Kaufman, A
影响因子：
2.9
作者：
Larrasoana, Juan C.;Roberts, Andrew P.;Rohling, Eelco J.
通讯作者：
Rohling, Eelco J.
影响因子：
5
作者：
Muehlinghuas, Christian;Scholz, Denis;Mangini, Augusto
通讯作者：
Mangini, Augusto
影响因子：
1.8
作者：
Hoffmann, Dirk L.;Prytulak, Julie;Scholz, Denis
通讯作者：
Scholz, Denis