Fossil pigments as indicators for palaeoclimatic interpretations —A case study of Qinghai Lake |
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| Authors: | Han Xiaozhong Shen Han Wang Sumin Yu Yuansheng |
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| Institution: | (1) Nanjing Institute of Geography and Limnology, Academia Sinica, 210008 Nanjing |
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| Abstract: | An 82 cm core was collected from Qinghai Lake in the Qinghai-Xizang Plateau, China and sectioned in intervals of 1 cm for
analysis of pigments (i. e. chlorophyll derivatives, carotenoids, myxoxanthophyll, oscillaxanthin) and210Pb.210Pb dating was used to establish the chronological sequence. The concentrations of myxoxanthophyll and oscillaxanthin from
the cyanophytes increase with temperature. There are four peak values at 0–14 cm (present−1891a), 25 cm (1786a), 45 cm (1581a),
60 cm (1416a) representing four warm and low water level periods during the past 700 years. This was confirmed by the high
concentration of carbonate and ∂13C in these stages. In these 700 years, there were also 4 periods of cold wet climate and high water level as indicated by
the tree ring index and high value of native chlorophyll and high, variable CD/TC ratios.
The project was supported by the Loess and Quaternary Research Lab, Academia Sinica. |
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| Keywords: | pigment palaeoclimate core Qinghai Lake |
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