Journal Article

PreJuSER-48547

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Sensitivity of biogenic silica oxygen isotopes to changes in surface water temperature and palaeoclimatology

Moschen, R.FZJ* ; Lücke, A.FZJ* ; Schleser, G. H.FZJ*

2005
American Geophysical Union Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/20812  doi:10.1029/2004GL022167

Abstract: 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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Sedimentäre Systeme (ICG-V)

Research Program(s):

1. Chemie und Dynamik der Geo-Biosphäre (U01)

Appears in the scientific report 2005

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Database coverage:

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