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Paleohydrological processes revealed by n-alkane δD in lacustrine sediments of Lake Pumoyum Co, southern Tibetan Plateau, and their response to climate changes during the past 18.5 cal ka

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Abstract

In this study, compound-specific hydrogen isotope values of n-alkanes (n-alkane δD) in a sediment core that dates to 18.5 cal ka BP were used to reconstruct the paleohydrological processes that couple glacial meltwater and precipitation at Lake Pumoyum Co, on the southern Tibetan Plateau. The lowest lake level, from 18.5 to 15.0 cal ka BP, may reflect both less glacial meltwater and less precipitation entering the lake. Glacial meltwater generally increased from 15.0 to 7.2 cal ka BP and decreased after 7.2 cal ka BP, whereas precipitation generally increased from 15.0 to 10.2 cal ka BP, decreased from 10.2 to 7.2 cal ka BP, then remained stable and moderate to the present. Comparisons of our results with records in adjacent areas and beyond suggest that the glacial meltwater supply during the past 15 cal ka corresponds well with changes in the Indian Summer Monsoon (ISM), which are driven by summer insolation at millennial time scales, whereas the precipitation does not match well with ISM changes during the Holocene. Therefore, paleohydrological processes at Lake Pumoyum Co have shown complex responses to climate change. Overall, our results emphasize that reconstruction of paleohydrological processes of lakes on the Tibetan Plateau should be carried out with caution because of glacial meltwater input.

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Acknowledgments

This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB03030000), the National Natural Science Foundation of China (Grant Nos. 41130529 and 41301206) and the National Basic Research Program of China (Grant No. 2012CB956101).

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Wang, Y., Zhu, L., Wang, J. et al. Paleohydrological processes revealed by n-alkane δD in lacustrine sediments of Lake Pumoyum Co, southern Tibetan Plateau, and their response to climate changes during the past 18.5 cal ka. J Paleolimnol 56, 223–238 (2016). https://doi.org/10.1007/s10933-016-9909-z

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