DOI: 10.1016/j.quascirev.2013.07.034
Scopus记录号: 2-s2.0-84882982302
论文题名: A new regional, mid-Holocene palaeoprecipitation signal of the Asian Summer Monsoon
作者: Strong D. ; Flecker R. ; Valdes P.J. ; Wilkinson I.P. ; Rees J.G. ; Michaelides K. ; Zong Y.Q. ; Lloyd J.M. ; Yu F.L. ; Pancost R.D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 78 起始页码: 65
结束页码: 76
语种: 英语
英文关键词: Organic geochemistry
; Pearl River
; Summer Asian Monsoon
Scopus关键词: Asian monsoon
; Asian summer monsoons
; Earth system model
; Model inter comparisons
; Organic geochemistry
; Pearl River
; Pearl River estuary
; Project simulation
; Atmospheric thermodynamics
; Biogeochemistry
; Biological materials
; Caves
; Climate change
; Climate models
; Computer simulation
; Earth (planet)
; Estuaries
; Organic compounds
; Water analysis
; Watersheds
; C (programming language)
; biomarker
; carbon isotope
; cultivation
; global climate
; Holocene
; monsoon
; organic matter
; oxygen isotope
; paleoatmosphere
; paleoclimate
; sediment core
; speleothem
; summer
; China
; Guangdong
; Pearl Basin
; United States
; Zhujiang Estuary
英文摘要: The Dongge Cave speleothem δ18O record, which lies in the Pearl River basin (China), has been interpreted as recording a regional decline in Asian Summer Monsoon precipitation over the last 6.5ka. The same overall trend is seen in the bulk sedimentary organic δ13Corg record from a core in the Pearl River Estuary. However, the two records differ in detail and the regional nature of the Dongge palaeoprecipitation signal has therefore been questioned. Our study re-evaluates both records by constructing, for the same estuarine core, biomarker and compound-specific δ13C records, which have better constrained terrestrial and marine end members than δ13Corg, providing additional insights into the evolution of the Asian Summer Monsoon.The Branched Isoprenoidal Tetraether (BIT) index reflects the ratio of soil versus marine organic matter. The BIT record from the estuarine core co-varies with the Dongge Cave δ18O record suggesting the two share a common control which is likely to be driven by regional climate. By contrast, the sterols, n-alcohols and n-fatty acid ratios show the same overall trend as Dongge, but parallel the δ13Corg record's variability between 6.5 and 2ka indicating a partial decoupling between soil and land-plant organic matter fluxes in the Pearl River Basin. There is clear divergence between the biomarker and13Corg records from 2ka to present. Analysis of the leaf wax δ13C suggests that this results from an abrupt change in vegetation probably resulting from local, anthropogenic cultivation two thousand years ago.The basin scale of these estuarine records equates to up to 15 grid cells in typical Earth System Models used for simulating global climate. This permits comparison of Palaeoclimate Model Intercomparison Project simulations of the mid-Holocene with spatially equivalent data relating to the Summer Asian Monsoon, for the first time. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60508
Appears in Collections: 过去全球变化的重建
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作者单位: School of Geographical Sciences, University of Bristol, University Road, Bristol BS8 1SS, United Kingdom; Organic Geochemistry Unit, Cabot Institute, School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, United Kingdom; British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, United Kingdom; Department of Earth Sciences, University of Hong Kong, James Lee Sciences Building, Pokfulam Road, Hong Kong; Department of Geography, University of Durham, South Road, Durham DH1 3LE, United Kingdom; Earth Observatory of Singapore, Nanyang Technological University, 50 Nanyang Avenue, Block N2-01a-15, Singapore
Recommended Citation:
Strong D.,Flecker R.,Valdes P.J.,et al. A new regional, mid-Holocene palaeoprecipitation signal of the Asian Summer Monsoon[J]. Quaternary Science Reviews,2013-01-01,78