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

Content Provider	Springer Nature Link
Author	Li, Shen Yong, Wang Xingqi, Liu Matsumoto, Ryo
Copyright Year	2006
Abstract	On the basis of multi-proxy analysis on TOC, TN, 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.
Starting Page	103
Ending Page	110
Page Count	8
File Format	PDF
ISSN	02544059
Journal	Chinese Journal of Oceanology and Limnology
Volume Number	24
Issue Number	2
e-ISSN	19935005
Language	English
Publisher	Science Press
Publisher Date	2013-01-31
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	Quaternary climate record organic δ13C C/N ratio sediment Qinghai Lake Oceanography
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Oceanography

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