气候变化领域集成服务门户(CCPortal): Indian Ocean Summer Monsoon (IOSM)-dynamics within the past 4 ka recorded in the sediments of Lake Nam Co, central Tibetan Plateau (China)

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DOI	10.1016/j.quascirev.2012.02.011
	Indian Ocean Summer Monsoon (IOSM)-dynamics within the past 4 ka recorded in the sediments of Lake Nam Co, central Tibetan Plateau (China)
	Kasper, Thomas; Haberzettl, Torsten; Doberschuetz, Stefan; Daut, Gerhard; Wang, Junbo; Zhu, Liping; Nowaczyk, Norbert; Maeusbacher, Roland
通讯作者	Kasper, T (通讯作者)
发表日期	2012
ISSN	0277-3791
起始页码	73
结束页码	85
卷号	39
英文摘要	In September 2008 several cores (68 cm-115 cm length) (water depth: 93 m) were retrieved from Lake Nam Co (southern-central Tibetan Plateau; 4718 m a.s.l.). This study focuses on the interpretation of high-resolution (partly 0.2 cm) data from three gravity cores and the upper part of a 10.4 m long piston core, i.e., the past 4000 cal BP in terms of lake level changes, hydrological variations in the catchment area and consequently variations in monsoon strength. A wide spectrum of sedimentological, geochemical and mineralogical investigations was carried out. Results are presented for XRF core-scans, grain size distribution, XRD-measurements and SEM-image analyses. These data are complemented by an age-depth model using Pb-210 and Cs-137 analyses as well as eleven AMS-C-14-ages. This model is supported by excellent agreement between secular variations determined on one of the gravity cores to geomagnetic field models. This is a significant improvement of the chronology as most catchments of lacustrine systems on the Tibetan Plateau contain carbonates resulting in an unknown reservoir effect for radiocarbon dates. The good correlation of our record to the geomagnetic field models confirms our age-depth model and indicates only insignificant changes in the reservoir effect throughout the last 4 ka. High (summer-) monsoonal activity, i.e. moist environmental conditions, was detected in our record between approximately 4000 and 1950 cal BP as well as between 1480 and 1200 cal BP. Accordingly, lower monsoon activity prevails in periods between the two intervals and thereafter. This pattern shows a good correlation to the variability of the Indian Ocean Summer Monsoon (IOSM) as recorded in a peat bog similar to 1000 km in NE direction from Lake Nam Co. This is the first time that such a supra regional homogenous monsoon activity is shown on the Tibetan Plateau and beyond. Finally our data show a significant lake level rise after the Little Ice Age (LIA) in Lake Nam Co which is suggested to be linked to glacier melting in consequence of rising temperatures occurring on the whole Tibetan Plateau during this time. (c) 2012 Elsevier Ltd. All rights reserved.
关键词	LAGUNA-POTROK-AIKE PALEOMAGNETIC SECULAR VARIATION HOLOCENE CLIMATE DEVELOPMENT SOUTHERN PATAGONIA ENVIRONMENTAL-CHANGES HYDROLOGICAL CHANGES LEVEL FLUCTUATIONS SANTA-CRUZ YR-BP BASIN
英文关键词	Tibetan Plateau; Monsoon; Lake level variation; Lake Nam Co; Lake sediment; Magnetostratigraphy
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000303550200006
来源期刊	QUATERNARY SCIENCE REVIEWS
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/258051
推荐引用方式 GB/T 7714	Kasper, Thomas,Haberzettl, Torsten,Doberschuetz, Stefan,et al. Indian Ocean Summer Monsoon (IOSM)-dynamics within the past 4 ka recorded in the sediments of Lake Nam Co, central Tibetan Plateau (China)[J]. 中国科学院青藏高原研究所,2012,39.
APA	Kasper, Thomas.,Haberzettl, Torsten.,Doberschuetz, Stefan.,Daut, Gerhard.,Wang, Junbo.,...&Maeusbacher, Roland.(2012).Indian Ocean Summer Monsoon (IOSM)-dynamics within the past 4 ka recorded in the sediments of Lake Nam Co, central Tibetan Plateau (China).QUATERNARY SCIENCE REVIEWS,39.
MLA	Kasper, Thomas,et al."Indian Ocean Summer Monsoon (IOSM)-dynamics within the past 4 ka recorded in the sediments of Lake Nam Co, central Tibetan Plateau (China)".QUATERNARY SCIENCE REVIEWS 39(2012).