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首页> 外文期刊>Journal of Paleolimnology >Solar and anthropogenic imprints on Lake Masoko (southern Tanzania) during the last 500 years
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Solar and anthropogenic imprints on Lake Masoko (southern Tanzania) during the last 500 years

机译：过去500年间在Masoko湖（坦桑尼亚南部）上的太阳和人为烙印

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摘要

The Masoko crater-lake in southern Tanzania provides a continuous record of environmental changes covering the last 500 years. Multi-proxy studies were performed on a 52 cm sediment core retrieved from the deepest part of the lake. Magnetic, organic carbon, geochemical proxies and pollen assemblages indicate a dry climate during the ‘Little Ice Age’ (AD 1550–1850), confirming that the LIA in eastern Africa resulted in marked and synchronous hydrological changes. However, the direction of response varies between different African lakes (low versus high lake-levels), indicating strong regional contrasts that prevent the clear identification of climate trends over eastern Africa at this time. Inferred changes in Masoko lake-levels closely resemble the record of solar activity cycles, indicating a possible control of solar activity on the climate in this area. This observation supports previous results from East African lakes, and extends this relationship southward. Finally, anthropogenic impact is observed in the Masoko sediments during the last 60 years, suggesting that human disturbance significantly affected this remote basin during colonial and post-colonial times.
机译：坦桑尼亚南部的Masoko火山口湖连续500年记录了环境变化。对从湖泊最深处回收的52厘米沉积物岩心进行了多代理研究。磁性，有机碳，地球化学代理和花粉组合表明在“小冰河时代”（公元1550–1850年）期间气候干燥，这证实了东部非洲的LIA导致了明显而同步的水文变化。但是，响应的方向在不同的非洲湖泊之间有所不同（低湖水位与高湖水位），这表明强烈的区域差异阻碍了此时非洲东部地区气候趋势的清晰识别。 Masoko湖水位的推断变化与太阳活动周期的记录非常相似，这表明该地区气候可能控制了太阳活动。这一观察结果支持了来自东非湖泊的先前结果，并将这种关系向南延伸。最后，在过去60年中，在Masoko沉积物中观察到了人为影响，这表明在殖民时期和后殖民时期，人为干扰严重影响了这个偏远盆地。

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  • 来源
    《Journal of Paleolimnology》 |2007年第4期|475-490|共16页
  • 作者

    Yannick Garcin; David Williamson; Laurent Bergonzini; Olivier Radakovitch; Annie Vincens; Guillaume Buchet; Jo?l Guiot; Simon Brewer; Pierre-Etienne Mathé; Amos Majule;

  • 作者单位

    CEREGE UMR 6635 CNRS-Université Paul Cézanne BP 80 Aix-en-Provence Cedex 04 F-13545 France;

    CEREGE UMR 6635 CNRS-Université Paul Cézanne BP 80 Aix-en-Provence Cedex 04 F-13545 France;

    UMR 8148 IDES CNRS-Université Paris-Sud bat. 504 Orsay Cedex F-91405 France;

    CEREGE UMR 6635 CNRS-Université Paul Cézanne BP 80 Aix-en-Provence Cedex 04 F-13545 France;

    CEREGE UMR 6635 CNRS-Université Paul Cézanne BP 80 Aix-en-Provence Cedex 04 F-13545 France;

    CEREGE UMR 6635 CNRS-Université Paul Cézanne BP 80 Aix-en-Provence Cedex 04 F-13545 France;

    CEREGE UMR 6635 CNRS-Université Paul Cézanne BP 80 Aix-en-Provence Cedex 04 F-13545 France;

    CEREGE UMR 6635 CNRS-Université Paul Cézanne BP 80 Aix-en-Provence Cedex 04 F-13545 France;

    CEREGE UMR 6635 CNRS-Université Paul Cézanne BP 80 Aix-en-Provence Cedex 04 F-13545 France;

    Institute of Resource Assessment University of Dar-es-Salaam P.O. Box 35 097 Dar-es-Salaam Tanzania;

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  • 正文语种 eng
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  • 关键词

    Africa; Tropics; Lake; Paleoclimate; Little Ice Age; Solar activity; Anthropogenic disturbances;

    机译：非洲;热带;湖泊;古气候;小冰期;太阳活动;人为干扰;

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