气候变化领域集成服务门户(CCPortal): Precipitation dynamics on the Tibetan Plateau during the Late Quaternary - Hydroclimatic sedimentary proxies versus lake level variability

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DOI	10.1016/j.gloplacha.2021.103594
	Precipitation dynamics on the Tibetan Plateau during the Late Quaternary - Hydroclimatic sedimentary proxies versus lake level variability
	Kasper, Thomas; Wang, Junbo; Schwalb, Antje; Daut, Gerhard; Plessen, Birgit; Zhu, Liping; Maeusbacher, Roland; Haberzettl, Torsten
通讯作者	Kasper, T (通讯作者)
发表日期	2021
ISSN	0921-8181
EISSN	1872-6364
卷号	205
英文摘要	Two of the largest and deepest endorheic lakes on the Tibetan Plateau, Nam Co and Tangra Yumco, were targeted to infer Late Quaternary (24 ka) responses of their hydrological balance to environmental dynamics. For this purpose, high-resolution multi-proxy records were used to obtain information on lake level variations and how these are related to direct precipitation proxies. Allochthonous minerogenic input as reflected by potassium (K), is directly linked to precipitation driven by variations in Indian Summer Monsoon. Negatively correlated elements such as Ca, Sr and Mg and associated carbonate mineral phases represent autochthonous sediment production, which is coupled to evaporation in these closed systems. delta C-13 and delta O-18 of bulk carbonates represent lake water conditions, i.e., salinity and lake water volume, interpreted as precipitation-evaporation (P/E) balance. In combination with geomorphological features, i.e., lake level terraces and paleo-shorelines, the multy-proxy data set from Nam Co is used to reconstruct lake level dynamics. Low lake levels of >90 m below the recent one between 20 and 16 ka cal BP are associated with most enriched delta 18Ocarb values and the precipitation of aragonite and high-Mg calcite in a shallow lake with highly dynamic allochthonous minerogenic input. Similar conditions are observed between 13.1 and 11.4 ka cal BP matching the Younger Dryas chronozone. Between 15.5 and 13.1 ka cal BP as well as during the Early Holocene (11.4 to 8.0 ka cal BP) distinctly depleted delta O-18(carb) and delta C-13(carb) coupled with high rates of allochthonous minerogenic input suggest substantial strengthening in precipitation. After 9.4 ka cal BP, the terrigenous input and thus precipitation is significantly reduced, whereas delta O-18(carb) reveals only a slight enrichment trend and thus a slowly but steady decrease in lake level througout the Mid-to Late Holocene. The decoupling of this relation between precipitation and lake level suggest that lake level terraces of large endorheic lakes on the TP and also delta O-18(carb) records are not a direct indicator of (monsoonal) precipitiation, whereas the allochtonous minerogenic input can be directly linked to precipitation dynamics. This is supported by the comparison to regional archives from the Arabian Sea and the northern Bay of Bengal, showing the very same pattern in precipitation variability. The presented monsoon precipitation record from Nam Co additionally reveals a link to supra-regional atmospheric circulation components as it is oscillating in-and anti-phase to ElNino strength and frequency. A distinct precipitation change at 2 ka cal BP seems to have affected all archives, however leaving space for future studies to find the cause of this Late-Holocene climatic shift.
关键词	ASIAN SUMMER MONSOON NAM CO BASIN HOLOCENE ENVIRONMENTAL-CHANGES OXYGEN-ISOTOPE FRACTIONATION LAST GLACIAL MAXIMUM TANGRA YUMCO HYDROLOGICAL CHANGES ORGANIC-MATTER INDIAN MONSOON EL-NINO
英文关键词	Nam Co; Tangra Yumco; Indian Monsoon; delta O-18(carb); Allochthonous minerogenic input
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000692367400002
来源期刊	GLOBAL AND PLANETARY CHANGE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260443
推荐引用方式 GB/T 7714	Kasper, Thomas,Wang, Junbo,Schwalb, Antje,et al. Precipitation dynamics on the Tibetan Plateau during the Late Quaternary - Hydroclimatic sedimentary proxies versus lake level variability[J]. 中国科学院青藏高原研究所,2021,205.
APA	Kasper, Thomas.,Wang, Junbo.,Schwalb, Antje.,Daut, Gerhard.,Plessen, Birgit.,...&Haberzettl, Torsten.(2021).Precipitation dynamics on the Tibetan Plateau during the Late Quaternary - Hydroclimatic sedimentary proxies versus lake level variability.GLOBAL AND PLANETARY CHANGE,205.
MLA	Kasper, Thomas,et al."Precipitation dynamics on the Tibetan Plateau during the Late Quaternary - Hydroclimatic sedimentary proxies versus lake level variability".GLOBAL AND PLANETARY CHANGE 205(2021).