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Can ?18O help indicate the causes of recent lake area expansion on the western Tibetan Plateau? A case study from Aweng Co

Zhang, Yuzhi; Jones, Matthew; Zhang, Jiawu; McGowan, Suzanne; Metcalfe, Sarah

Can ?18O help indicate the causes of recent lake area expansion on the western Tibetan Plateau? A case study from Aweng Co Thumbnail


Authors

Yuzhi Zhang

MATTHEW JONES MATTHEW.JONES@NOTTINGHAM.AC.UK
Professor of Quaternary Science

Jiawu Zhang

Suzanne McGowan



Abstract

© 2020, Springer Nature B.V. Glacier-fed lakes on the Tibetan Plateau (TP) have undergone rapid expansions since the late 1990s, concurrent with the changing climate. However, the dominant cause(s) of lake area increases is still debated. To identify the drivers of lake expansion, we studied Aweng Co, a glacier-fed lake in the western TP, where surface area has increased (0.74km2year−1) since the late 1970s and most rapidly (0.998 km2year−1) since the late 1990s. A water balance model was used to clarify the reasons for increased lake water volume, supported by stable isotope hydrology and the δ18O change recorded in recent sediments. Results showed that glacial meltwater probably had the biggest impact on changes in Aweng Co lake level in recent decades, but that precipitation was also an important contributor. Our study shows that δ18O of carbonate (δ18Ocarb) has great potential for indicating source changes of water supply in such lakes, but there is a need to be cautious when interpreting δ18Ocarb due to the influence of multiple hydrological factors, which can change in dominance over time.

Journal Article Type Article
Acceptance Date Sep 24, 2020
Online Publication Date Oct 23, 2020
Publication Date Oct 23, 2020
Deposit Date Oct 24, 2020
Publicly Available Date Oct 24, 2021
Journal Journal of Paleolimnology
Print ISSN 0921-2728
Electronic ISSN 1573-0417
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1007/s10933-020-00158-6
Keywords Earth-Surface Processes; Aquatic Science
Public URL https://nottingham-repository.worktribe.com/output/4986841
Publisher URL https://link.springer.com/article/10.1007%2Fs10933-020-00158-6

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