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    Global temperature calibration of the alkenone unsaturation index (UK′37) in surface waters and comparison with surface sediments

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    Conte et al.pdf (6.818Mb)
    Date
    2006-02-07
    Author
    Conte, Maureen H.  Concept link
    Sicre, Marie-Alexandrine  Concept link
    Ruhlemann, Carsten  Concept link
    Weber, John C.  Concept link
    Schulte, Sonja  Concept link
    Schulz-Bull, Detlef  Concept link
    Blanz, Thomas  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/652
    As published
    https://doi.org/10.1029/2005GC001054
    DOI
    10.1029/2005GC001054
    Keyword
     Alkenones; Paleoproxies; Sea surface temperature; UK′37 
    Abstract
    In this paper, we compile the current surface seawater C37 alkenone unsaturation (UK′37) measurements (n=629, −1 to 30°C temperature range) to derive a global, field-based calibration of UK′37 with alkenone production temperature. A single nonlinear “global” surface water calibration of UK′37 accurately predicts alkenone production temperatures over the diversity of modern-day oceanic environments and alkenone-synthesizing populations (T=−0.957 + 54.293(UK′37) − 52.894(UK′37)2 + 28.321(UK′37)3, r2=0.97, n=567). The mean standard error of estimation is 1.2°C with insignificant bias in estimated production temperature among the different ocean regions sampled. An exception to these trends is regions characterized by strong lateral advection and extreme productivity and temperature gradients (e.g., the Brazil-Malvinas Confluence). In contrast to the surface water data, the calibration of UK′37 in surface sediments with overlying annual mean sea surface temperature (AnnO) is best fit by a linear model (AnnO=29.876(UK′37) − 1.334, r2=0.97, n=592). The standard error of estimation (1.1°C) is similar to that of the surface water production calibration, but a higher degree of bias is observed among the regional data sets. The sediment calibration differs significantly from the surface water calibration. UK′37 in surface sediments is consistently higher than that predicted from AnnO and the surface water production temperature calibration, and the magnitude of the offset increases as the surface water AnnO decreases. We apply the global production temperature calibration to the coretop UK′37 data to estimate the coretop alkenone integrated production temperature (coretop IPT) and compare this with the overlying annual mean sea surface temperature (AnnO). We use simple models to explore the possible causes of the deviation observed between the coretop temperature signal, as estimated by UK′37, and AnnO. Our results indicate that the deviation can best be explained if seasonality in production and/or thermocline production as well as differential degradation of 37:3 and 37:2 alkenones both affect the sedimentary alkenone signal.
    Description
    Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 7 (2006): Q02005, doi:10.1029/2005GC001054.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Geochemistry Geophysics Geosystems 7 (2006): Q02005
     

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