Holocene monsoon dynamics at Kunlun Pass on the northeastern Qinghai-Tibet Plateau
Holocene monsoon dynamics at Kunlun Pass on the northeastern Qinghai-Tibet Plateau
复制标题
青藏高原东北部昆仑山口全新世季风动态
DOI：
10.1016/j.scitotenv.2021.145369
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发表时间：
2021-02-02
影响因子：
9.8
通讯作者：
Wu, Qingbai
中科院分区：
文献类型：
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作者：
Chen, Peng;Yu, Zhongbo;Wu, Qingbai
各种替代记录已被用来了解全新世的环境和气候变化。Be-10通量在全新世早期水平相对较低，随后在4ka BP（距今4000年）左右急剧上升至较高水平。此后，Be-10通量在晚全新世期间保持较高水平，但在今天略有下降。将这些Be-10沉积模式与印度夏季风（ISM）、东亚夏季风（EASM）和西风带主导地区的水汽变化进行了比较。与季风模式的逐渐变化不同，Be-10数据在全新世早期显示出低水平，直到大约4 ka BP时才有明显的增加，并且持续到今天的相对高水平，这与西风带的模式相对更符合。这一发现提供了一个新的证据，表明KP地区大气环流的主导模式从一个更季风的模式转变为一个以西风带为主的模式。(C) 2021 Elsevier B.V.版权所有
Various proxy records have been used for the understanding of environmental and climate variations during the Holocene. Here, for the first time, we use meteoric Be-10 isotope measurements performed on sediments from a drill core collected at the Kunlun Pass (KP) on the northeastern Qinghai-Tibet Plateau (NETP) to investigate hydroclimate changes during the Holocene. The Be-10 flux suggests relative low levels in the Early Holocene, followed by a sharp increase to high values at around 4 ka BP (4 ka BP - 4000 years before present). Afterwards, the Be-10 flux remains on a high level during the Late Holocene, but decreases slightly towards today. These Be-10 deposition patterns are compared to moisture changes in regions dominated by the Indian Summer Monsoon (ISM), East Asian Summer Monsoon (EASM), and the Westerlies. Different from the gradual changes in monsoon patterns, the Be-10 data reveal low levels during the Early Holocene until similar to 4 ka BP when an obvious increase is indicated and a relative high level continues to this day, which is relatively more in agreement with patterns of the Westerlies. This finding provides a new evidence fora shift in the dominant pattern of atmospheric circulation the KP region from a more monsoonal one to one dominated by the Westerlies. Our results improve the understanding of non-stationary interactions and spatial relevance of the EASM, the ISM and the Westerlies on the Qinghai-Tibet Plateau. (C) 2021 Elsevier B.V. All rights reserved.