NDLI: Holocene lake level variations of Longmu Co, western Qinghai-Tibetan Plateau

Content Provider	Springer Nature Link
Author	Liu, Xiang Jun Madsen, David B. Liu, Ruiyuan Sun, Yongjuan Wang, Yixuan
Copyright Year	2016
Abstract	Longmu Co is surrounded by conspicuous regressive shorelines attesting to high-water levels in the past. In this study, we dated paleoshoreline sediments around the lake using optically stimulated luminescence (OSL), infrared stimulated luminescence (IRSL) and radiocarbon dating, then explored the forces that drove Holocene lake level variations. We found that: (1) OSL/IRSL ages are consistent with geomorphic sequences and some extant cosmogenic and U/Th shoreline ages. However, inorganic evaporite crust $^{14}$C ages are much older than corresponding OSL/IRSL ages due to varying lake reservoir effects and should be used with caution; (2) The highest lake levels of Longmu Co (~160–145 m above present) lasted from ~12.8 to ~11.3 ka. Two periods of abrupt lake level declines occurred at ~11.3 and ~7.4 ka (lake level dropped ~44 and ~45 m, respectively), with a gradual regression of ~18 m between these two intervals. The lake expanded moderately from ~7 to 5.5 ka, then declined once more after ~5.5 ka, with this regression accelerating during the last ~1.5 ka; (3) The deglacial lake level transgression was likely due to glacier melt waters. The Indian Summer Monsoon reached the Longmu Co watershed and brought precipitation during the early Holocene. Middle to late Holocene lake regression was caused by the retreat of the monsoon and consequent environmental deterioration.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	4
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Western Qinghai-Tibetan Plateau Paleoshorelines Lake level variations Luminescence dating Radiocarbon dating Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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