A mid-Holocene drought interval as evidenced by lake desiccation in the Alashan Plateau, Inner Mongolia, China
A mid-Holocene drought interval as evidenced by lake desiccation in the Alashan Plateau, Inner Mongolia, China
复制标题
DOI：
10.1360/03wd0245
复制
发表时间：
2003-07-01
影响因子：
--
通讯作者：
Oviatt, CG
中科院分区：
文献类型：
--
作者：
Chen, FH;Wu, W;Oviatt, CG
中国的全新世中期传统上被认为是一个夏季风强盛的温暖湿润时期，常被称为全新世气候适宜期或大暖期。在此，我们展示了来自蒙古高原一部分的阿拉善高原的湖泊地貌和岩性证据，这些证据表明全新世中期湖泊强烈干涸。还展示了来自处于现今夏季风边缘的猪野泽湖的高分辨率花粉数据。这些数据显示，巴丹吉林沙漠以西的居延泽湖盆地、巴丹吉林沙漠和腾格里沙漠之间的猪野泽湖盆地以及腾格里沙漠东部的湖泊中现今的湖泊和湿地，在距今约5000 - 7000年（以碳 - 14测定的年代）的全新世中期干涸或处于低水位。花粉数据进一步表明，当地地区和祁连山脉的植被覆盖都减少了，这表明当时的气候比现今亚洲夏季风相关的气候更为干燥。这种全新世中期的干旱期在内蒙古高原南部相当大的区域都存在。这一时期可能也更寒冷，至少在亚洲高原和高山地区是如此。
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-Holocene 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.