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| Titel |
Modern isotope hydrology and controls on δD of plant leaf waxes at Lake El'gygytgyn, NE Russia |
| VerfasserIn |
K. M. K. Wilkie, B. Chapligin, H. Meyer, S. Burns, S. Petsch, J. Brigham-Grette |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 1 ; Nr. 9, no. 1 (2013-02-08), S.335-352 |
| Datensatznummer |
250017441
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| Publikation (Nr.) |
 copernicus.org/cp-9-335-2013.pdf |
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| Zusammenfassung |
| Stable isotope data from lipid biomarkers and diatom silica recovered from
lake sediment cores hold great promise for paleoclimate and
paleohydrological reconstructions. However, these records rely on accurate
calibration with modern precipitation and hydrologic processes and only
limited data exist on the controls on the δD values for
n-alkanoic acids from plant leaf waxes. Here we investigate the stable
isotopic composition of modern precipitation, streams, lake water and ice
cover, and use these data to constrain isotope systematics of the Lake
El'gygytgyn Basin hydrology. Compound-specific hydrogen isotope ratios
determined from n-alkanoic acids from modern vegetation are compared with
modern precipitation and lake core top sediments. Multi-species net
(apparent) fractionation values between source water (precipitation) and
modern vegetation (e.g., ϵwax/precip mean value is
−107 ± 12‰) agree with previous results and
suggest a consistent offset between source waters and the δD values
of alkanoic acids. We conclude that although there may be some bias towards
a winter precipitation signal, overall δD values from leaf wax
n-alkanoic acids record annual average precipitation within the El'gygytgyn
Basin. A net fractionation calculated for 200-yr-integrated lake sediments
yields ϵ30/precip = −96 ± 8‰ and can provide robust net "apparent" fractionation to be used in future
paleohydrological reconstructions. |
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