NDLI: Re-examination of the temperature-dependent relationship between δ$^{18}$O$_{diatoms}$ and δ$^{18}$O$_{lake water}$ and implications for paleoclimate inferences

Content Provider	Springer Nature Link
Author	Crespin, Julien Sylvestre, Florence Alexandre, Anne Sonzogni, Corinne Paillès, Christine Perga, Marie Elodie
Copyright Year	2010
Abstract	The oxygen isotope composition (δ$^{18}$O) of diatoms is commonly used for paleoclimate reconstruction. There is, however, no consensus regarding the equilibrium isotopic fractionation factor between diatom silica and the water in which it is precipitated. We re-examined the temperature-dependent relationship between δ$^{18}$O$_{diatoms}$ and δ$^{18}$O$_{lake water}$ from Lake Annecy (France). A temperature coefficient of −0.16‰/°C (R $^{2}$ = 0.51) was determined, supporting findings from previous calibration studies. However, regression lines obtained from different calibration studies, though displaying similar slopes, were shifted. In this manuscript, we propose that several factors, including selected variables (temperature, δ$^{18}$O$_{lake water}$), analytical techniques, the impact of diagenetic processes and biological effects, may influence the silica-water fractionation factor for diatom silica. The similar magnitude of the diatom-temperature coefficients determined across studies is promising, supporting its use as a valuable tool for interpreting variations in δ$^{18}$O values from fossil lacustrine diatoms in temperate lakes. With respect to paleoclimatic applications, the temperature-dependent relationship yielded uncertainties of ±3°C on reconstructed temperatures and ±0.5‰ on δ$^{18}$O$_{lake water}$.
Starting Page	547
Ending Page	557
Page Count	11
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	44
Issue Number	2
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-04-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diatoms Oxygen isotopes Fractionation factor Lake Geology Freshwater & Marine Ecology Physical Geography Climate Change Sedimentology Paleontology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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