Oxygen isotope ratios of sedimentary biogenic silica reflect the European transcontinental climate gradient
Oxygen isotope ratios of sedimentary biogenic silica reflect the European transcontinental climate gradient
复制标题
沉积生物二氧化硅的氧同位素比反映了欧洲跨大陆气候梯度
DOI:
10.1002/jqs.1172
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发表时间:
2008
影响因子:
2.3
通讯作者:
Gleixner
中科院分区:
文献类型:
--
作者:
Sloane;Sachse;Gleixner
Oxygen isotope ratios of biogenic silica offer considerable potential in tracing past climate change using both marine and lacustrine sediment records. Despite recent improvements and standardisation in preparatory and analytical methods, evidence for a systematic relationship between climate parameters and the oxygen isotope composition of sedimentary diatom silica (δ18Osilica) is contradictory. In particular, observed differences between theδ18Osilicaof living and sedimentary diatom silica in both lake and marine environments question the validity of applying isotope fractionation models derived from living diatoms to reconstructing climate from sediment records. In order to address this issue, oxygen isotope ratios of biogenic silica (δ18Osilica) are examined from a suite of lake surface sediment samples which span a large climatic gradient across western Europe.δ18Osilicavalues are strongly correlated with air temperature and the isotope composition of precipitation (δ18OP). When evaporation of lake waters is accounted for, the time‐averaged surface sediment data suggest a fractionation of ∼35‰ between water and biogenic silica. However, the effect of temperature appears less marked than that observed between contemporary diatoms and lake water over short timescales, suggesting that diagenetic processes may lead to a reduction in the temperature sensitivity of sedimentδ18Osilicarecords. Comparison ofδ18Osilicadata withδD analysed fromn‐alkanes of aquatic origin (n‐C17,n‐C21 andn‐C23) demonstrates that the slope of the regionalδ18O:δD water line is preserved within the sediment record, offering exciting potential for palaeoclimate research. © Natural Environment Research Council (NERC) copyright 2008. Reproduced with the permission of NERC. Published by John Wiley & Sons, Ltd.
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影响因子:
56.9
作者:
Barker, PA;Street-Perrott, FA;Ficken, KJ
通讯作者:
Ficken, KJ
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
M. Schmidt;R. Botz;D. Rickert;G. Bohrmann;S. Hall;S. Mann
通讯作者:
S. Mann
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
M. Leng;Philip Barnker;P. Greenwood;N. Roberts;J. Reed
通讯作者:
J. Reed
影响因子:
64.8
作者:
L. Labeyrie
通讯作者:
L. Labeyrie
影响因子:
5
作者:
D. Sachse;J. Radke;G. Gleixner
通讯作者:
D. Sachse;J. Radke;G. Gleixner