A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau

Shen Li; Wang Yong; Liu Xingqi; Ryo Matsumoto

doi:10.1007/BF02842807

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A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau

OriginalPaper | Updated：2023-05-16

- A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau
- A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau
- 海洋湖沼学报（英文） 2006年24卷第2期页码：103-110
- Affiliations：
  
  1. Key Laboratory of Lake Sedimentation and Environment Nanjing Institute of Geography and Limnology C..S,A
  2. Graduate School Chinese Academy of Sciences
  3. Department of Earth and Planetary Science University of Tokyo
- Author bio：
- Funds：
  
  Supported by National Key Basic Research Fund (No. 2004CB720205) and National Nature and Science Foundation of China (No. 40331003).
- DOI：10.1007/BF02842807
  中图分类号：
- 网络首发：2013-01-31，
  
  纸质出版：2006
- Accepted：
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A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau[J]. 海洋湖沼学报（英文）, 2006,24(2):103-110.

Li, S., Yong, W., Xingqi, L. et al. A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau., Chin. J. Ocean. Limnol. 24, 103–110 (2006). https://doi.org/10.1007/BF02842807
A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau[J]. 海洋湖沼学报（英文）, 2006,24(2):103-110. DOI： 10.1007/BF02842807.

Li, S., Yong, W., Xingqi, L. et al. A 16 ka climate record deduced from δ13C and C/N ratio in Qinghai Lake sediments, northeastern Tibetan Plateau., Chin. J. Ocean. Limnol. 24, 103–110 (2006). https://doi.org/10.1007/BF02842807 DOI：

摘要

Abstract

On the basis of multi-proxy analysis on TOC

C/N

organic δ13C and grain size

sediment record from Qinghai Lake provides evidences of stepwise-patterned climatic change since 16 ka BP. Results show that Qinghai Lake underwent six environmental stages. From 16.2 to 14.3 ka BP and from 4.0 to 2.1 ka BP

the organic δ13C value was controlled by the concentration of atmospheric CO2. Relative higher organic δ13C values occurred between 14.3 to 10.4 ka BP indicative of water hardness decrease resulted from melting ice water

corresponding to two intervals of C/N peak values to the Böling and Alleröd warm periods in Europe respectively. From 10.4 ka BP

Qinghai Lake entered the Holocene and the climate was warm and a little dry. The Megathermal appeared at about 6.7 ka BP when the vegetation around the lake transformed into a forest. Between 6.3 ka BP and 4.0 ka BP

the temperature decreased and δ13C value was controlled by the expansion of C3 plants and the retreat of C4 plants in river catchment. Since 4.0 ka BP

the climate gradually became cold and dry. From 2.1 ka BP

the cold-dry climate and human activity resulted in an abrupt increase in C/N with deceased δ13C value; meanwhile

many coarse grains appeared in sediments.

关键词

Keywords

references

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