Asynchronous evolution of the isotopic composition and amount of precipitation in north China during the Holocene revealed by a record of compound-specific carbon and hydrogen isotopes of long-chain n-alkanes from an alpine lake
Asynchronous evolution of the isotopic composition and amount of precipitation in north China during the Holocene revealed by a record of compound-specific carbon and hydrogen isotopes of long-chain n-alkanes from an alpine lake
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高山湖泊长链正构烷烃化合物特异性碳氢同位素记录揭示全新世华北地区同位素组成与降水量的异步演化
DOI：
10.1016/j.epsl.2016.04.027
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发表时间：
2016-07
影响因子：
5.3
通讯作者：
Fahu Chen
中科院分区：
文献类型：
--
作者：
Yunxia Li;Jianhui Chen;Qinghai Xu;Fahu Chen
中国季风区东亚夏季风最大强度出现的时间以及中国石笋氧同位素记录（δ 18 O）的环境意义一直存在争议。在这里，我们提出了一个CA。中国北方高山湖泊沉积物柱状样中长链烷烃的120年分辨率碳（δ 13 C）和氢（δD）同位素研究。我们的δ 13 C数据，以及以前报道的花粉数据从一个平行的核心，证明了一个潮湿的中全新世从约。8-5 ka BP。假设华北地区的气候湿度是东亚夏季风强度的指示因子，则东亚夏季风最大强度出现在全新世中期。δ D值与莲花洞δ 18O值具有相似的长期变化趋势，表明同步δ D和δ 18O值分别真实地记录了降水的δ D和δ 18O值。δ D和δ 18O值最负的时期为全新世早中期，约为2000年至3000年。11-5 ka BP。同位素变化时间的这种对比表明降水的同位素组成与降水量或东亚夏季风强度之间存在复杂的关系。进一步的比较表明，中国北方的降水量与赤道太平洋的东西向热力梯度之间可能存在联系。此外，水汽源区的温度对我国季风区降水的同位素组成也有重要的影响。
Both the timing of the maximum East Asian summer monsoon (EASM) intensity in monsoonal China and the environmental significance of the Chinese stalagmite oxygen isotopic record (δ 18 O) have been debated. Here, we present a ca. 120-year-resolution compound-specific carbon (δ 13 C) and hydrogen (δD) isotopes of terrestrial long-chain n-alkanes extracted from a well-dated sediment core from an alpine lake in north China. Our δ 13 C data, together with previously reported pollen data from a parallel core, demonstrate a humid mid-Holocene from ca. 8–5 ka BP. Assuming that the climatic humidity of north China is an indicator of the EASM intensity, then the maximum EASM intensity occurred in the mid-Holocene. Our δ D data reveal a similar long-term trend to the δ 18 O record from nearby Lianhua Cave, indicating that the synchronous δ D and δ 18 O records faithfully record the δ D and δ 18 O of precipitation, respectively. The most negative δ D and δ 18 O values occur in the early–mid Holocene, from ca. 11–5 ka BP. This contrast in the timing of isotopic variations demonstrates a complex relationship between the isotopic composition of precipitation and precipitation amount, or EASM intensity. Further comparisons indicate a possible linkage between the precipitation amount in north China and the west–east thermal gradient in the equatorial Pacific. In addition, the temperature of the moisture source area may play an important role in determining the isotopic composition of precipitation in monsoonal China.
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影响因子：
3
作者：
Z. Rao;Zhaoyu Zhu;G. Jia;A. Henderson;Qian Xue;Suping Wang
通讯作者：
Z. Rao;Zhaoyu Zhu;G. Jia;A. Henderson;Qian Xue;Suping Wang
DOI：
10.1016/b978-012614440-6/50011-2
发表时间：
1999
期刊：
--
影响因子：
--
作者：
R. Sage;D. Wedin;Meirong Li
通讯作者：
R. Sage;D. Wedin;Meirong Li
影响因子：
64.8
作者：
Yongjin Wang;Hai Cheng;R. Edwards;X. Kong;X. Shao;Shitao Chen;Jiangying Wu;X. Jiang;Xianfeng Wa
通讯作者：
Yongjin Wang;Hai Cheng;R. Edwards;X. Kong;X. Shao;Shitao Chen;Jiangying Wu;X. Jiang;Xianfeng Wa
影响因子：
18.3
作者：
Pausata, Francesco S. R.;Battisti, David S.;Bitz, Cecilia M.
通讯作者：
Bitz, Cecilia M.
影响因子：
16.6
作者：
Caley, Thibaut;Roche, Didier M.;Renssen, Hans
通讯作者：
Renssen, Hans