Palaeovariations in the east-asian monsoon regime geochemically recorded in varved sediments of lake sihailongwan (Northeast China, Jilin Province). Part 1: Hydrological conditions and dust flux

doi:10.1007/s10933-005-0096-6

	Palaeovariations in the east-asian monsoon regime geochemically recorded in varved sediments of lake sihailongwan (Northeast China, Jilin Province). Part 1: Hydrological conditions and dust flux
	Schettler, G ; Liu, Q ; Mingram, J ; Negendank, JFW
刊名	JOURNAL OF PALEOLIMNOLOGY
	2006-02-01
卷号	35 期号:2 页码:239-270
关键词	Dust Flux East-asian Monsoon Geochemistry Hydrology Palaeoclimate Sediments
ISSN号	0921-2728
DOI	10.1007/s10933-005-0096-6
文献子类	Article
英文摘要	The varved sediments of the dimictic Lake Sihailongwan (Long Gang mountain area, Jilin Province, Northeast China) represent a palaeoclimatic archive which documents the local precipitation frequency during the summer monsoon, and variations in the aeolian flux of dust with their remote sources in the arid and semi-arid regions of inner Asia. Based on a detailed discussion of sediment genesis in Lake SHL, dust flux rates and palaeohydrological conditions were reconstructed on a decadal scale over the past 220 years. The aeolian influx by dry and wet deposition was quantified and characterised in its chemical composition. Photosynthetic production in the lake is positively correlated with the inflow of nutrient-rich groundwater. The groundwater discharge largely reflects the strength of the summer monsoon. Net accumulation rates for biogenic silica were determined for annually laminated sediments from the centre of the U-shaped lake basin based on sediment data. In a Si-balance model of the modern lake, the depositional flux of biogenic silica could be independently quantified on the base of hydrochemical monitoring data. Comparison of the both estimates allowed to asses the focussing of the particle flux in the lake. Though water retention in Lake SHL is rather high (ca. 30 years), changes in the hydrological conditions are sensitively recorded in the sediments because (i) nutrient-rich groundwater discharges into the productive zone of the lake, (ii) a substantial proportion of the total dissolved Si-inventory of the mixed lake (ca. 30%) is annually consumed by diatom growth, and (3) sediment accumulation is substantially focussed towards the flat bottom of the lake basin. The bulk siliciclastic sediment fraction (ca. 75 wt.%) largely originates from influx of dust of remote provenance. In sediment thin-sections, the dry-deposited dust fraction is microscopically identifiable as seasonal silt layer. Aeolian input by wet-deposition shows a distinctly higher variability than the influx of dust by dry-deposition. As diatom production, wet-deposition of dust is positively correlated with the rainfall during the summer monsoon. The inferred positive correlation between rainfall and dust flux during the summer monsoon implies that dust deposition is determined by the out-wash efficiency of mineral particles for a permanent high atmospheric dust concentration over Northeast China in the last 220 years.
WOS关键词	ISOTOPE COMPOSITION ; LOESS PLATEAU ; PRECIPITATION ; PROVENANCE ; CIRCULATION ; TRANSPORT ; PACIFIC
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Marine & Freshwater Biology
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000234730300002
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/65910]
专题	中国科学院地质与地球物理研究所
通讯作者	Schettler, G
作者单位	1.Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Schettler, G,Liu, Q,Mingram, J,et al. Palaeovariations in the east-asian monsoon regime geochemically recorded in varved sediments of lake sihailongwan (Northeast China, Jilin Province). Part 1: Hydrological conditions and dust flux[J]. JOURNAL OF PALEOLIMNOLOGY,2006,35(2):239-270.
APA	Schettler, G,Liu, Q,Mingram, J,&Negendank, JFW.(2006).Palaeovariations in the east-asian monsoon regime geochemically recorded in varved sediments of lake sihailongwan (Northeast China, Jilin Province). Part 1: Hydrological conditions and dust flux.JOURNAL OF PALEOLIMNOLOGY,35(2),239-270.
MLA	Schettler, G,et al."Palaeovariations in the east-asian monsoon regime geochemically recorded in varved sediments of lake sihailongwan (Northeast China, Jilin Province). Part 1: Hydrological conditions and dust flux".JOURNAL OF PALEOLIMNOLOGY 35.2(2006):239-270.