Large Holocene summer temperature oscillations and impact on the peopling of the northeastern Tibetan Plateau
Large Holocene summer temperature oscillations and impact on the peopling of the northeastern Tibetan Plateau
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DOI：
10.1002/2015gl067317
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发表时间：
2016-02-16
影响因子：
5.2
通讯作者：
An, Zhisheng
中科院分区：
文献类型：
--
作者：
Hou, Juzhi;Huang, Yongsong;An, Zhisheng
青藏高原夏季气温对冰川的稳定性有着重要影响，冰川为世界近一半的人口提供了稳定的水资源。然而，缺乏可靠的，长期的代理记录极大地阻碍了区域温度对气候强迫的敏感性的理解。在这里，我们提出了一个16ka长，烯酮为基础的夏季温度记录，青海湖，东北TP，展示了主要的区域温度响应的变化，夏季太阳辐射和大西洋经向翻转环流在全新世和晚冰期。重要的是，我们发现在5到3.5ka之间有一段持续的夏季温度下降（>4摄氏度），这与巴伦支海冰层覆盖范围的扩大相吻合，并且可能是由西风带的增强所驱动的。这一异常漫长和显著的区域性变冷事件可能使TP高海拔地区（> 3000米）的人类定居推迟了至少500年。
Summer temperatures on the Tibetan Plateau (TP) significantly affect stability of glaciers that provide steady water resources to nearly half of the world population. However, lack of reliable, long-term proxy records greatly impedes understanding of regional temperature sensitivity to climate forcings. Here we present a 16ka long, alkenone-based summer temperature record from Lake Qinghai, northeastern TP that demonstrates major regional temperature response to changes in summer insolation and Atlantic Meridional Overturning Circulation during the Holocene and late glacial. Importantly, we find a period of sustained summer temperature decline (>4 degrees C) between 5 and 3.5ka, which coincides with expansion of Barents Sea ice coverage and is likely driven by intensification of the Westerlies. This unusually long and pronounced regional cooling event likely delayed permanent human settlements on the high-altitude regions (>3000m) of the TP by at least 500years.