Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3207708m&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 7, CiteID L07708
Physics
8
Geochemistry: Stable Isotope Geochemistry (0454, 4870), Biogeosciences: Limnology (1845, 4239, 4942), Geochemistry: Organic And Biogenic Geochemistry, Hydrology: Hydroclimatology, Atmospheric Composition And Structure: Instruments And Techniques
Scientific paper
Oxygen isotope ratios of biogenic silica derived from planktonic diatoms living in the pelagial of a freshwater lake are used to determine the temperature effect on the isotope fractionation between water and biogenic silica under ecosystem conditions. Our data show a deterministic relation between seasonally changing water temperatures (4°C-22°C) and the oxygen isotope fractionation during valve formation. The temperature dependent fractionation appears to be independent of diatom cell sizes indicating a mere physical control of this process. The isotopic change induced per degree centigrade, the temperature coefficient, amounts to a value of -0.2‰/°C. This implies that previous studies have overestimated the temperature relationship of this proxy by using coefficients of up to -0.5‰/°C for climate reconstructions.
Lucke Andreas
Moschen Robert
Schleser Gerhard H.
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