globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2012.07.014
Scopus记录号: 2-s2.0-84881369010
论文题名:
Palaeo-seasonality of the last two millennia reconstructed from the oxygen isotope composition of carbonates and diatom silica from Nar Gölü, central Turkey
作者: Dean J.R.; Jones M.D.; Leng M.J.; Sloane H.J.; Neil Roberts C.; Woodbridge J.; Swann G.E.A.; Metcalfe S.E.; Eastwood W.J.; Yiǧitbaşioǧlu H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 66
起始页码: 35
结束页码: 44
语种: 英语
英文关键词: δ18O ; Energy-Dispersive X-ray Spectroscopy ; Lake sediments ; Mass balance ; Near East ; Seasonality
Scopus关键词: Energy dispersive x-ray spectroscopy ; Lake sediments ; Mass balance ; Near East ; Seasonality ; Carbonates ; Carbonation ; Energy dispersive spectroscopy ; Isotopes ; Oxygen ; Sediments ; Snow melting systems ; Lakes ; carbonate ; chemical composition ; diatom ; dominance ; estimation method ; growth rate ; lacustrine deposit ; lake ecosystem ; Little Ice Age ; oxygen isotope ; precipitation (climatology) ; seasonal variation ; seasonality ; silica ; snowmelt ; water budget ; Nar Lake ; Nigde ; Turkey ; Bacillariophyta
英文摘要: Carbonates and diatoms are rarely deposited together in lake sediments in sufficient quantities for the oxygen isotope composition (δ18O) to be investigated simultaneously from both hosts. Here, d18Ocarbonate are compared to δ18Odiatom data from the varved sediments of Nar Gölü, a closed lake in central Turkey, over the last 1710 years. Lake monitoring suggests carbonate is probably precipitated during MayeJune and δ18Ocarbonate is a proxy for regional water balance. Diatom activity is mainly weighted towards the spring. At times between ~301 and 561 AD, while δ18Ocarbonate values are the highest for the entire 1710 year period, suggesting summer drought, δ18Ocorrected-diatom values are among the lowest. δ18Olakewater values estimated for the times of diatom growth and carbonate precipitation show large differences. We suggest this could be explained by increased snowmelt that formed a freshwater lid on the lake at the time of peak diatom growth. Increased snowmelt is also inferred ~561-801 AD. From 801 AD to the present, precipitation is less winter-dominated, although increased snowmelt is inferred 921-1071 AD and in the latter part of the Little Ice Age (i.e. the mid to late 1800s AD). By combining oxygen isotope data from hosts that form in lakes at different times of the year, we show that such analyses can provide insights into palaeo-seasonality. © 2012 Elsevier Ltd. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60741
Appears in Collections:过去全球变化的重建

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作者单位: School of Geography, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom; NERC Isotope Geosciences Laboratory, British Geological Survey, Nottingham NG12 5GG, United Kingdom; Department of Geology, University of Leicester, Leicester LE1 7RH, United Kingdom; School of Geography, Earth and Environmental Sciences, University of Plymouth, PL4 8AA, United Kingdom; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom; Department of Geography, Ankara University, Ankara, Turkey

Recommended Citation:
Dean J.R.,Jones M.D.,Leng M.J.,et al. Palaeo-seasonality of the last two millennia reconstructed from the oxygen isotope composition of carbonates and diatom silica from Nar Gölü, central Turkey[J]. Quaternary Science Reviews,2013-01-01,66
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