气候变化领域集成服务门户(CCPortal): Revisiting growth and decline of late Quaternary mega-lakes across the south-central Tibetan Plateau

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DOI	10.1016/j.quascirev.2020.106475
	Revisiting growth and decline of late Quaternary mega-lakes across the south-central Tibetan Plateau
	Jonell T.N.; Aitchison J.C.; Li G.; Shulmeister J.; Zhou R.; Zhang H.
发表日期	2020
ISSN	0277-3791
卷号	248
英文摘要	Lake basins record critical interactions between the hydrosphere, cryosphere and atmosphere. Their sediments and shoreline landforms archive timing, duration, and intensity of past climatic variability and environmental impacts over a variety of timescales. Thousands of lake systems spread across the internally drained Tibetan Plateau today, of which many are only the salty remains of much more expansive paleolakes in the past. This study presents new shoreline ages integrated with quantitative digital topographic analysis and regional geomorphic evidence to reconstruct the sizes and extents of late Quaternary rift lake systems for the south-central Tibetan Plateau. This study presents optically stimulated luminescence (OSL) and the first K-feldspar post-infrared infrared (pIRIR) stimulated luminescence ages for Zabuye Caka and Dawa Tso and tests if these lakes were once part of a singular Pleistocene mega-lake established across four N–S rift systems. Our new results show that two large but separate paleolake systems developed in the latest Pleistocene-earliest Holocene and no lake larger than ∼6460 km2 has existed since at least 41 ka in the Lunggar region. Early Holocene paleolakes expanded up to 7× modern (+220–335 km3) with two to four-fold asymmetric lake expansion in the west compared to the east. Findings corroborate earlier investigations, implying that dramatic runoff increase and/or evapotranspiration reduction prompted rapid earliest Holocene lake expansion. Precipitation variability, in combination with permafrost degradation, temperature and wind strength, governed paleolake moisture balance. Open-system lake behavior and evolving drainage configurations across complex topography explain delayed onsets of lake regression and punctuated lake decline. This suggests abrupt Holocene climate shifts are not necessarily required for punctuated lake decline. Lastly, unique geomorphological and paleoclimatic similarities between Tibetan and East African rift lakes highlight the potential for some Tibetan paleolakes to function as natural climate amplifiers over both short and geologic timescales. © 2020 The Authors
英文关键词	amplifier lake; geomorphology; lake; luminescence; monsoon; Quaternary; rift; Tibetan plateau
语种	英语
scopus关键词	Environmental impact; Expansion; Feldspar; Luminescence; Precipitation (meteorology); Topography; Central Tibetan plateau; Climatic variability; Complex topographies; Optically stimulated luminescence; Permafrost degradation; Precipitation variability; Stimulated luminescence; Topographic analysis; Lakes; climate variation; environmental impact; evapotranspiration; growth; Holocene; landform; paleoclimate; permafrost; Pleistocene-Holocene boundary; precipitation (climatology); Quaternary; runoff; shoreline change; China; Qinghai-Xizang Plateau
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151285
作者单位	School of Earth and Environmental Sciences, The University of Queensland, St. LuciaQLD 4072, Australia; Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China; School of Earth and Environment, University of Canterbury, Christchurch, 8140, New Zealand
推荐引用方式 GB/T 7714	Jonell T.N.,Aitchison J.C.,Li G.,et al. Revisiting growth and decline of late Quaternary mega-lakes across the south-central Tibetan Plateau[J],2020,248.
APA	Jonell T.N.,Aitchison J.C.,Li G.,Shulmeister J.,Zhou R.,&Zhang H..(2020).Revisiting growth and decline of late Quaternary mega-lakes across the south-central Tibetan Plateau.Quaternary Science Reviews,248.
MLA	Jonell T.N.,et al."Revisiting growth and decline of late Quaternary mega-lakes across the south-central Tibetan Plateau".Quaternary Science Reviews 248(2020).