An interlaboratory study of TEX86 and BIT analysis of sediments, extracts and standard mixture
Schouten, Stefan (NIOZ Royal Netherlands Institute for Sea Research. Department of Marine Organic Biogeochemistry)
Hopmans, Ellen C. (NIOZ Royal Netherlands Institute for Sea Research. Department of Marine Organic Biogeochemistry)
Rosell Melé, Antoni (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Pearson, Ann (Harvard University. Department of Earth and Planetary Sciences)
Adam, Pierre (Institut de Chimie de Strasbourg)
Bauersachs, Thorsten (Christian-Albrechts-University (Kiel, Alemanya). Institute of Geosciences)
Bard, Edouard (Aix-Marseille Université)
Bernasconi, Stefano M. (ETH Zürich. Geologisches Institut)
Bianchi, Thomas S. (Texas A&M University. Department of Oceanography)
Brocks, Jochen J. (The Australian National University. Research School of Earth Sciences)
Truxal Carlson, Laura (University of Washington. School of Oceanography)
Castañeda, Isla S. (University of Massachusetts Amherst. Department of Geosciences)
Derenne, Sylvie (Universite Pierre et Marie Curie)
Dogrul Selver, Ayça (University of Manchester. School of Earth, Atmospheric and Environmental Sciences)
Dutta, Koushik (University of Minnesota. Large Lakes Observatory)
Eglinton, Timothy (ETH Zürich)
Fosse, Celine (Chimie ParisTech)
Galy, Valier (Woods Hole Oceanographic Institution)
Grice, Kliti (Curtin University (Perth, Austràlia). Department of Chemistry)
Hinrichs, Kai-Uwe (Universität Bremen. MARUM Center for Marine Environmental Sciences)
Huang, Yongsong (Brown University. Department of Geological Sciences)
Huguet, Arnaud (Universite Pierre et Marie Curie)
Huguet, Carme (Huguet Micheo) (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Hurley, Sarah (Harvard University. Department of Earth and Planetary Sciences)
Ingalls, Anitra (University of Washington. School of Oceanography)
Jia, Guodong (Chinese Academy of Sciences. Guangzhou Institute of Geochemistry)
Keely, Brendan (University of York. Department of Chemistry)
Knappy, Chris (University of York. Department of Chemistry)
Kondo, Miyuki (National Institute for Environmental Studies (Tsukuba, Japó))
Krishnan, Srinath (Yale University. Department of Geology and Geophysics)
Lincoln, Sara (Massachusetts Institute of Technology (MIT))
Lipp, Julius (Universität Bremen. MARUM Center for Marine Environmental Sciences)
Mangelsdorf, Kai (GFZ German Research Centre for Geosciences (Potsdam, Alemanya))
Martınez-Garcıa, Alfredo (ETH Zürich. Geologisches Institut)
Menot, Guillemette (Aix-Marseille Université)
Mets, Anchelique (NIOZ Royal Netherlands Institute for Sea Research)
Mollenhauer, Gesine (Alfred Wegener Institute (Bremerhaven, Alemanya))
Ohkouchi, Naohiko (Japan Agency for Marine-Earth Science and Technology (JAMSTEC))
Ossebaar, Jort (NIOZ Royal Netherlands Institute for Sea Research)
Pagani, Mark (Yale University. Department of Geology and Geophysics)
Pancost, Richard D. (Bristol Biogeochemistry Research Centre (Bristol, Regne Unit))
Pearson, Emma J. (Newcastle University. School of Geography, Politics & Sociology)
Peterse, Francien (ETH Zürich)
Reichart, Gert-Jan (Utrecht University. Department of Earth Sciences)
Schaeffer, Philippe (Institut de Chimie de Strasbourg)
Schmitt, Gaby (Institut de Chimie de Strasbourg)
Schwark, Lorenz (Christian-Albrechts-University (Kiel, Alemanya). Institute of Geosciences)
Shah, Sunita R. (Woods Hole Oceanographic Institution)
Smith, Richard W. (Texas A&M University. Department of Oceanography)
Smittenberg, Rienk H. (Stockholm University. Department of Geological Sciences)
Summons, Roger E. (Massachusetts Institute of Technology (MIT))
Takano, Yoshinori (Japan Agency for Marine-Earth Science and Technology (JAMSTEC))
Talbot, Helen M. (Newcastle University. School of Geography, Politics & Sociology)
Taylor, Kyle W. R. (Bristol Biogeochemistry Research Centre (Bristol, Regne Unit))
Tarozo, Rafael (Brown University. Department of Geological Sciences)
Uchida, Masao (National Institute for Environmental Studies (Japó). Center for Environmental Measurement and Analysis)
van Dongen, Bart E. (University of Manchester. Williamson Research Centre for Molecular Environmental Science)
Van Mooy, Benjamin A. S. (Woods Hole Oceanographic Institution)
Wang, Jinxiang (Tongji University (Xina). The School of Ocean and Earth Sciences)
Warren, Courtney (Yale University. Department of Geology and Geophysics)
Weijers, Johan W. H. (Utrecht University. Department of Earth Sciences)
Werne, Josef P. (University of Minnesota)
Woltering, Martijn (Curtin University (Perth, Austràlia). Department of Chemistry)
Xie, Shucheng (China University of Geosciences. State Key Lab of Biogeology and Environmental Geology)
Yamamoto, Masanobu (Hokkaido University (Japó). Faculty of Environmental Earth Science)
Yang, Huan (China University of Geosciences. State Key Lab of Biogeology and Environmental Geology)
Zhang, Chuanlun L. (Tongji University (Xina). The School of Ocean and Earth Sciences)
Zhang, Yige (Yale University. Department of Geology and Geophysics)
Zhao, Meixun (Ocean University of China)
Sinninghe Damste, Jaap S. (NIOZ Royal Netherlands Institute for Sea Research)

Fecha:	2013
Resumen:	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 63- 4C when translated to temperature) but a large spread in BIT measurements (reproducibility 60. 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. 0C 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. , molarbased) 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.
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	TEX86 ; BIT ; GDGT ; Round robin
Publicado en:	Geochemistry, geophysics, geosystems, Vol. 14, issue 12 (Dec. 2013) , p. 5263-5285, ISSN 1525-2027

DOI: 10.1002/2013GC004904

23 p, 779.8 KB

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