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首页> 外文期刊>Chinese science bulletin >A mid-Holocene drought interval as evidenced by lake desiccation in the Alashan Plateau, Inner Mongolia, China
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A mid-Holocene drought interval as evidenced by lake desiccation in the Alashan Plateau, Inner Mongolia, China

机译：内蒙古阿拉善高原湖泊干旱证明了全新世中期干旱间隔

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摘要

The mid-Holocene in China is traditionally thought to be a warm and humid period with a strong summer monsoon, and is often termed the Holocene Climatic Optimum or Megathermal Period. Here we present lake geomorphologic and lithological evidence from the Alashan Plateau, part of the Mongolian Plateau, that indicates strong lake desiccation during the mid-Holocene. High resolution pollen data from Zhuyeze Lake, at the present summer monsoon margin, is also presented. These data show that present lakes and wetlands in the Juyanze Lake basin west of the Badain Jaran desert, in the Zhuyeze Lake basin between the Badain Jaran and Tengger deserts, and in lakes in the eastern Tengger desert, dried or experienced low lake levels in the mid-Holoeene around 5000 — 7000 cal yr BP. Pollen data further indicate that the vegetation cover declined in both the local areas and in the Qilian Mountains, suggesting the climate was drier than that associated with the present Asian summer monsoon. This mid-Holocene drought interval was present throughout a quite large region of the south Inner Mongolian Plateau. The period was also probably colder, at least in the high Asian plateaus and mountains.
机译：传统上，中国的全新世中期是一个温暖湿润的夏季季风强的时期，通常被称为全新世气候最佳或超高温时期。在这里，我们介绍了阿拉善高原（蒙古高原的一部分）的湖泊地貌和岩性证据，表明全新世中期湖体强烈干燥。还给出了目前夏季风季风边界的竹叶泽湖高分辨率花粉数据。这些数据表明，巴丹吉林沙漠西部的Juyanze湖流域，巴丹吉林沙漠与腾格沙漠之间的朱耶泽湖流域以及腾格沙漠东部的湖泊中，目前的湖泊和湿地在干枯或经历了低水位。大约5,000 – 7000 cal BP的中胡芦烯。花粉数据进一步表明，当地和祁连山的植被覆盖率均下降，这表明气候比当前亚洲夏季风更为干旱。整个内蒙古高原的整个南部地区都出现了这种全新世中期干旱间隔。至少在亚洲高原和山区，这一时期可能也更冷。

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