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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Wet phases in the Sahara/Sahel region and human migration patterns in North Africa
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Wet phases in the Sahara/Sahel region and human migration patterns in North Africa

机译：撒哈拉/萨赫勒地区的湿润阶段和北非的人口迁移模式

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摘要

The carbon isotopic composition of individual plant leaf waxes (a proxy for C_3 vs. C_4 vegetation) in a marine sediment core collected from beneath the plume of Sahara-derived dust in northwest Africa reveals three periods during the past 192,000 years when the central Sahara/Sahel contained C_3 plants (likely trees), indicating substantially wetter conditions than at present. Our data suggest that variability in the strength of Atlantic meridional overturning circulation (AMOC) is a main control on vegetation distribution in central North Africa, and we note expansions of C_3 vegetation during the African Humid Period (early Holocene) and within Marine Isotope Stage (MIS) 3 (≈50-45 ka) and MIS 5 (≈120-110 ka). The wet periods within MIS 3 and 5 coincide with major human migration events out of sub-Saharan Africa. Our results thus suggest that changes in AMOC influenced North African climate and, at times, contributed to amenable conditions in the central Sahara/Sahel, allowing humans to cross this otherwise inhospitable region.
机译：从西北非洲撒哈拉沙漠尘埃羽流下方收集的海洋沉积物芯中的单个植物叶蜡的碳同位素组成（C_3与C_4植被的替代物）揭示了过去192,000年中的三个时期，当时撒哈拉中部/萨赫勒地区含有C_3株植物（可能是树木），表明状况比目前湿润得多。我们的数据表明，大西洋经向翻转循环（AMOC）强度的变化是北非中部植被分布的主要控制因素，我们注意到在非洲湿润时期（全新世早期）和海洋同位素阶段（ MIS）3（≈50-45ka）和MIS 5（≈120-110ka）。 MIS 3和MIS 5中的湿润时期与撒哈拉以南非洲地区的重大人类迁徙事件相吻合。因此，我们的结果表明，AMOC的变化影响了北非的气候，有时甚至助长了撒哈拉/萨赫勒地区中部的适宜条件，使人类能够穿越这个原本不宜居住的地区。

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    Isla S. Castaneda; Stefan Mulitza; Enno Schefuss; Raquel A. Lopes dos Santos; Jaap S. Sinninghe Damste; Stefan Schouten;

  • 作者单位

    Department of Marine Organic Biogeochemistry, Royal Netherlands Institute for Sea Research, P. O. Box 59, 1790 AB Den Burg (Texel), The Netherlands;

    Department of Marine Organic Biogeochemistry, Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, D-28359 Bremen, Germany;

    Department of Marine Organic Biogeochemistry, Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, D-28359 Bremen, Germany;

    Department of Marine Organic Biogeochemistry, Royal Netherlands Institute for Sea Research, P. O. Box 59, 1790 AB Den Burg (Texel), The Netherlands;

    Department of Marine Organic Biogeochemistry, Royal Netherlands Institute for Sea Research, P. O. Box 59, 1790 AB Den Burg (Texel), The Netherlands;

    Department of Marine Organic Biogeochemistry, Royal Netherlands Institute for Sea Research, P. O. Box 59, 1790 AB Den Burg (Texel), The Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    n-alkane carbon isotopes; vegetation; atlantic meridional overturning circulation (AMOC);

    机译：正构烷烃碳同位素;植被;大西洋子午翻转环流（AMOC）;

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