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    An interlaboratory study of TEX86 and BIT analysis of sediments, extracts, and standard mixtures

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    Article (768.9Kb)
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    Supporting information (16.98Kb)
    Date
    2013-12-20
    Author
    Schouten, Stefan  Concept link
    Hopmans, Ellen C.  Concept link
    Rosell-Mele, Antoni  Concept link
    Pearson, Ann  Concept link
    Adam, Pierre  Concept link
    Bauersachs, Thorsten  Concept link
    Bard, Edouard  Concept link
    Bernasconi, Stefano M.  Concept link
    Bianchi, Thomas S.  Concept link
    Brocks, Jochen J.  Concept link
    Carlson, Laura Truxal  Concept link
    Castaneda, Isla S.  Concept link
    Derenne, Sylvie  Concept link
    Selver, Ayca Dogrul  Concept link
    Dutta, Koushik  Concept link
    Eglinton, Timothy I.  Concept link
    Fosse, Celine  Concept link
    Galy, Valier  Concept link
    Grice, Kliti  Concept link
    Hinrichs, Kai-Uwe  Concept link
    Huang, Yongsong  Concept link
    Huguet, Arnaud  Concept link
    Huguet, Carme  Concept link
    Hurley, Sarah  Concept link
    Ingalls, Anitra  Concept link
    Jia, Guodong  Concept link
    Keely, Brendan  Concept link
    Knappy, Chris  Concept link
    Kondo, Miyuki  Concept link
    Krishnan, Srinath  Concept link
    Lincoln, Sara  Concept link
    Lipp, Julius S.  Concept link
    Mangelsdorf, Kai  Concept link
    Martínez-Garcia, Alfredo  Concept link
    Menot, Guillemette  Concept link
    Mets, Anchelique  Concept link
    Mollenhauer, Gesine  Concept link
    Ohkouchi, Naohiko  Concept link
    Ossebaar, Jort  Concept link
    Pagani, Mark  Concept link
    Pancost, Richard D.  Concept link
    Pearson, Emma J.  Concept link
    Peterse, Francien  Concept link
    Reichart, Gert-Jan  Concept link
    Schaeffer, Philippe  Concept link
    Schmitt, Gaby  Concept link
    Schwark, Lorenz  Concept link
    Shah, Sunita R.  Concept link
    Smith, Richard W.  Concept link
    Smittenberg, Rienk H.  Concept link
    Summons, Roger E.  Concept link
    Takano, Yoshinori  Concept link
    Talbot, Helen M.  Concept link
    Taylor, Kyle W. R.  Concept link
    Tarozo, Rafael  Concept link
    Uchida, Masao  Concept link
    van Dongen, Bart E.  Concept link
    Van Mooy, Benjamin A. S.  Concept link
    Wang, Jinxiang  Concept link
    Warren, Courtney  Concept link
    Weijers, Johan W. H.  Concept link
    Werne, Josef P.  Concept link
    Woltering, Martijn  Concept link
    Xie, Shucheng  Concept link
    Yamamoto, Masanobu  Concept link
    Yang, Huan  Concept link
    Zhang, Chuanlun L.  Concept link
    Zhang, Yige  Concept link
    Zhao, Meixun  Concept link
    Sinninghe Damste, Jaap S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6486
    As published
    https://doi.org/10.1002/2013GC004904
    DOI
    10.1002/2013GC004904
    Keyword
     TEX86; BIT; GDGT; Round robin 
    Abstract
    Two commonly used proxies based on the distribution of glycerol dialkyl glycerol tetraethers (GDGTs) are the TEX86 (TetraEther indeX of 86 carbon atoms) paleothermometer for sea surface temperature reconstructions and the BIT (Branched Isoprenoid Tetraether) index for reconstructing soil organic matter input to the ocean. An initial round-robin study of two sediment extracts, in which 15 laboratories participated, showed relatively consistent TEX86 values (reproducibility ±3–4°C when translated to temperature) but a large spread in BIT measurements (reproducibility ±0.41 on a scale of 0–1). Here we report results of a second round-robin study with 35 laboratories in which three sediments, one sediment extract, and two mixtures of pure, isolated GDGTs were analyzed. The results for TEX86 and BIT index showed improvement compared to the previous round-robin study. The reproducibility, indicating interlaboratory variation, of TEX86 values ranged from 1.3 to 3.0°C when translated to temperature. These results are similar to those of other temperature proxies used in paleoceanography. Comparison of the results obtained from one of the three sediments showed that TEX86 and BIT indices are not significantly affected by interlaboratory differences in sediment extraction techniques. BIT values of the sediments and extracts were at the extremes of the index with values close to 0 or 1, and showed good reproducibility (ranging from 0.013 to 0.042). However, the measured BIT values for the two GDGT mixtures, with known molar ratios of crenarchaeol and branched GDGTs, had intermediate BIT values and showed poor reproducibility and a large overestimation of the “true” (i.e., molar-based) BIT index. The latter is likely due to, among other factors, the higher mass spectrometric response of branched GDGTs compared to crenarchaeol, which also varies among mass spectrometers. Correction for this different mass spectrometric response showed a considerable improvement in the reproducibility of BIT index measurements among laboratories, as well as a substantially improved estimation of molar-based BIT values. This suggests that standard mixtures should be used in order to obtain consistent, and molar-based, BIT values.
    Description
    Author Posting. © American Geophysical Union, 2013. 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 14 (2013): 5263–5285, doi:10.1002/2013GC004904.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 14 (2013): 5263–5285
     

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