Abrupt climate variability since the last deglaciation based on a high-resolution peat dust deposition record from southwest China
Abrupt climate variability since the last deglaciation based on a high-resolution peat dust deposition record from southwest China
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基于中国西南地区高分辨率泥炭尘沉积记录的上次冰消期以来的气候突变
DOI：
10.1016/j.quascirev.2020.106749
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发表时间：
2021-01
影响因子：
4
通讯作者：
Yetang Hong
中科院分区：
文献类型：
--
作者：
Haijun Peng;Kunshan Bao;Lingui Yuan;Masao Uchida;Cheng Cai;Yongxuan Zhu;Bing Hong;Qian Guo;Hanwei Ding;Hu Yao;Yetang Hong
由于高分辨率的地质档案数量很少，对末次冰消期以来东亚气候突变的机制仍然探索不足。本文通过对横断山区一个6 m泥炭档案的主量元素和微量元素（包括稀土元素）分析，重建了末次冰消期以来季风气候的快速变化。理化参数和Ca/Mg比值的变化反映了岳西泥炭柱8800年来的富营养化特征。在老仙女木（OD），新仙女木（YD），和4.2 kyr冷事件期间确定的粉尘通量的突然增加。中全新世期间，矿物尘通量保持相当稳定和低。8800 - 5000卡/年BP之间的最低平均降尘速率代表了中国长期大气降尘通量的基线。Y/REE、La/Yb、Y/Yb、Y/Er比值表明西北沙漠、黄土高原和西藏土壤是岳西泥炭地的主要尘源。与全球气候记录的对比表明，中国西南地区气候变化与北大西洋变冷事件存在遥相关关系，这意味着沙尘通量的突变与亚洲季风的变化有关。我们的研究结果还表明，增加的人类活动显着贡献的粉尘通量在晚全新世。
The mechanism of abrupt climate changes in east Asia since the last deglaciation remains poorly explored due to the low number of high-resolution geological archives. Here we present a major and trace element including rare-earth elements (REEs) analysis of a 6 m peat archive from the Hengduan Mountains to reconstruct the rapid changes in monsoonal climate since the last deglaciation. The physicochemical parameters and Ca/Mg ratio illustrated the ombrotrophic characterization of the Yuexi peat core over the last 8800 years. Abrupt increases in dust fluxes were identified during the Old Dryas (OD), the Younger Dryas (YD), and the 4.2 kyr cold event periods. The mineral dust flux remained quite stable and low during the middle Holocene. The lowest average dust deposition rate between 8800 and 5000 cal yr BP represents a baseline of long-term atmospheric dust flux in China. The Y/ΣREE, La/Yb, Y/Yb, Y/Er indicate that deserts in northwest China, the Loess Plateau, and Tibetan soils were the dominant dust sources to the Yuexi peatland. The comparison with global climatic records suggested a teleconnection between the climate change in southwest China and North Atlantic cooling events, which implies that the abrupt variation in dust fluxes was linked with Asian monsoons variations. Our results also reveal that increased human activities significantly contribute to the dust fluxes during the late Holocene.
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影响因子：
56.9
作者：
Shotyk, W;Weiss, D;Van der Knaap, WO
通讯作者：
Van der Knaap, WO
影响因子：
4.4
作者：
M. Blaauw;J. Christen
通讯作者：
M. Blaauw;J. Christen
影响因子：
2.2
作者：
Yang Gao;K. Xiong;Mingying Quan;B. Song;Haijun Peng;H. Peng;Weidan Shen;K. Bao
通讯作者：
Yang Gao;K. Xiong;Mingying Quan;B. Song;Haijun Peng;H. Peng;Weidan Shen;K. Bao
影响因子：
5.3
作者：
W. Shotyk;M. Krachler;A. Martinez‐Cortizas;A. Cheburkin;H. Emons
通讯作者：
W. Shotyk;M. Krachler;A. Martinez‐Cortizas;A. Cheburkin;H. Emons
影响因子：
4
作者：
Xuan‐Yu Chen;S. Blockley;Yigang Xu;M. Menzies
通讯作者：
Xuan‐Yu Chen;S. Blockley;Yigang Xu;M. Menzies