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Increased winter-spring precipitation from the last glaciation to the Holocene inferred from a δ13Corg record from Yili Basin (Xinjiang, NW China)

  • Keliang ZhaoEmail author
  • Xiaoqiang LiEmail author
  • Hai Xu
  • Xingying Zhou
  • John Dodson
  • Junchi Liu
Research Paper
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Abstract

The nature and dynamics of climate change in central Asia since the late Pleistocene are controversial. Moreover, most of the published studies focus mainly on the evolution of moisture conditions, and there have been few attempts to address changes in seasonality. In this study, records of δ13Corg, TOC, TN, C/N and grain size were obtained from lacustrine sediments at Yili Basin, Xinjiang, NW China. Our aim was to reconstruct the trend in seasonality of precipitation from the last glaciation to the Holocene. The organic matter content of the sediments is derived predominantly from terrestrial plants. The δ13Corg values vary from -19.4% to -24.8%, indicating that the vegetation was dominated by C3 plants. Winter-spring precipitation is identified as the factor determining the relative proportions of C3 and C4 plants in the region. A negative trend in δ13Corg corresponding to an increase in the relative abundance of C3 plants indicate a trend of increasing winter-spring precipitation from the last glaciation to the Holocene. The increased incidence of wintertime storms in the interior of Asia is suggested to result in the increase of winterspring precipitation in the Holocene.

Keywords

Organic matter Central Asia C3 and C4 plants Seasonality changes Winter-spring precipitation 

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Notes

Acknowledgements

We thank Dr. Guilin Zhang for helpful discussions about the age model. This study was supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB26000000), the National Natural Science Foundation of China (Grant Nos. 41772371, 41572161 & 41730319), the National Basic Research Program of China (Grant No. 2015CB953803), the Youth Innovation Promotion Association CAS, and the Australian Nuclear Science and Technology Organization.

Supplementary material

11430_2018_9333_MOESM1_ESM.pdf (133 kb)
Supplementary material, approximately 228 KB.

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© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijingChina
  2. 2.CAS Center for Excellence in Life and PaleoenvironmentBeijingChina
  3. 3.Institute of Surface-Earth System ScienceTianjin UniversityTianjingChina
  4. 4.School of Earth, Atmospheric and Life SciencesUniversity of WollongongNSWAustralia
  5. 5.Institute of Earth EnvironmentChinese Academy of SciencesXi’anChina

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