This title appears in the Scientific Report :
2005
Please use the identifier:
http://hdl.handle.net/2128/20812 in citations.
Please use the identifier: http://dx.doi.org/10.1029/2004GL022167 in citations.
Sensitivity of biogenic silica oxygen isotopes to changes in surface water temperature and palaeoclimatology
Sensitivity of biogenic silica oxygen isotopes to changes in surface water temperature and palaeoclimatology
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...
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Personal Name(s): | Moschen, R. |
---|---|
Lücke, A. / Schleser, G. H. | |
Contributing Institute: |
Sedimentäre Systeme; ICG-V |
Published in: | Geophysical research letters, 32 (2005) S. L07708 |
Imprint: |
Washington, DC
American Geophysical Union
2005
|
Physical Description: |
L07708 |
DOI: |
10.1029/2004GL022167 |
Document Type: |
Journal Article |
Research Program: |
Chemie und Dynamik der Geo-Biosphäre |
Series Title: |
Geophysical Research Letters
32 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1029/2004GL022167 in citations.
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 degrees C-22 degrees 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 parts per thousand/degrees C. This implies that previous studies have overestimated the temperature relationship of this proxy by using coefficients of up to -0.5 parts per thousand/degrees C for climate reconstructions. |