期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 446, 期 -, 页码 68-76出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2016.04.027
关键词
long-chain n-alkanes; delta C-13 and delta D; precipitation amount; north China; isotopes in precipitation; Holocene
资金
- National Science Foundation of China [41171091, 41372181, 41130102]
- project of Chinese Ministry of Education [113057A]
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 (delta O-18) have been debated. Here, we present a ca. 120-year-resolution compound-specific carbon (delta C-13) and hydrogen (SD) isotopes of terrestrial long-chain n-alkanes extracted from a well-dated sediment core from an alpine lake in north China. Our delta C-13 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 SD data reveal a similar long-term trend to the delta O-18 record from nearby Lianhua Cave, indicating that the synchronous SD and delta O-18 records faithfully record the SD and delta O-18 of precipitation, respectively. The most negative SD and delta O-18 values occur in t he 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. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据