Interlaboratory Comparison of Branched GDGT Temperature and pH Proxies Using Soils and Lipid Extracts
De Jonge, Cindy (ETH Zürich. Geological Institute)
Peterse, Francien (Utrecht University. Department of Earth Sciences)
Nierop, Klaas G.J. (Utrecht University. Department of Earth Sciences)
Blattmann, Thomas M. (ETH Zürich. Geological Institute)
Alexandre, Marcelo (Brown University. Department of Earth and Planetary Science)
Ansanay-Alex, Salome (Centre National de la Recherche Scientifique. Université de Lyon)
Austin, Thomas (GNS Science (New Zealand))
Babin, Mathieu (University of Quebec Rimouski. Institute of Marine Sciences)
Bard, Edouard (Centre National de la Recherche Scientifique. Aix-Marseille Université)
Bauersachs, Thorsten (Kiel University. Institute of Geosciences)
Blewett, Jerome (Harvard University. Department of Earth and Planetary Sciences)
Boehman, Brenna (Woods Hole Oceanographic Institution (Woods Hole, Estats Units d'Amèrica))
Castañeda, Isla S. (University of Massachusetts Amherst. Department of Earth, Geographic and Climate Sciences)
Chen, Junhui (Ministry of Natural Resources. The First Institute of Oceanography (China))
Conti, Martina L.G. (University of York. Department of Chemistry)
Contreras, Sergio (Universidad Católica de la Santísima Concepción)
Cordes, Julia (University of Bremen)
Davtian, Nina (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
van Dongen, Bart (University of Manchester. Department of Earth and Environmental Sciences)
Duncan, Bella (Victoria University of Wellington. Antarctic Research Centre)
Elling, Felix J. (Kiel University. Leibniz Laboratory for Radiometric Dating and Isotope Research)
Galy, Valier (Woods Hole Oceanographic Institution (Woods Hole, Estats Units d'Amèrica))
Gao, Shaopeng (Chinese Academy of Sciences. Institute of Tibetan Plateau Research)
Hefter, Jens (Helmholtz Centre for Polar and Marine Research. Alfred Wegener Institute)
Hinrichs, Kai Uwe (University of Bremen)
Helling, Mitchell R. (University of Wyoming. Department of Chemistry)
Hoorweg, Mariska (Utrecht University. Department of Earth Sciences)
Hopmans, Ellen (Royal Netherlands Institute for Sea Research)
Hou, Juzhi (Chinese Academy of Sciences. Institute of Tibetan Plateau Research)
Huang, Yongsong (Brown University. Department of Earth and Planetary Science)
Huguet, Arnaud (Centre National de la Recherche Scientifique. Sorbonne University)
Jia, Guodong (Tongji University. State Key Laboratory of Marine Geology)
Karger, Cornelia (GFZ German Research Centre for Geosciences (Potsdam, Alemanya))
Keely, Brendan J. (University of York. Department of Chemistry)
Kusch, Stephanie (University of Quebec Rimouski. Institute of Marine Sciences)
Li, Hui (Tongji University. State Key Laboratory of Marine Geology)
Liang, Jie (Chinese Academy of Sciences. Institute of Tibetan Plateau Research)
Lipp, Julius S. (University of Bremen)
Liu, Weiguo (Chinese Academy of Sciences. Institute of Earth Environment)
Lu, Hongxuan (Chinese Academy of Sciences. Institute of Earth Environment)
Mangelsdorf, Kai (GFZ German Research Centre for Geosciences (Potsdam, Alemanya))
Manners, Hayley (University of Plymouth)
Martinez Garcia, Alfredo (Max Planck Institute for Chemistry)
Ménot, Guillemette (Centre National de la Recherche Scientifique. Université de Lyon)
Mollenhauer, Gesine (Helmholtz Centre for Polar and Marine Research. Alfred Wegener Institute)
Naafs, B. David A. (University of Bristol)
Naeher, Sebastian (GNS Science (New Zealand))
O'Connor, Lauren K. (University of Manchester. Department of Earth and Environmental Sciences)
Pearce, Ethan M. (University of York. Department of Chemistry)
Pearson, Ann (Harvard University. Department of Earth and Planetary Sciences)
Rao, Zhiguo (Hunan Normal University. Key Laboratory of Ecological and Environmental Change in Subtropical Zone)
Rodrigo-Gámiz, Marta (Universidad de Granada. Departamento de Estratigrafía y Paleontología)
Rosendahl, Chris (Kiel University. Leibniz Laboratory for Radiometric Dating and Isotope Research)
Rostek, Frauke (Centre National de la Recherche Scientifique. Aix-Marseille Université)
Bao, Rui (Ocean University of China. Institute for Advanced Ocean Studies)
Sanyal, Prasanta (Indian Institute of Science Education and Research)
Schubotz, Florence (University of Bremen)
Scott, Wesley (University of Pittsburgh. Department of Geology and Environmental Sciences)
Sen, Rahul (Indian Institute of Science Education and Research)
Sluijs, Appy (Utrecht University. Department of Earth Sciences)
Smittenberg, Rienk (Stockholm University. Department of Geological Sciences)
Stefanescu, Ioana (University of Wyoming. Department of Geology and Geophysics)
Sun, Jia (University of Bristol)
Sutton, Paul (University of Plymouth)
Tierney, Jess (University of Arizona. Department of Geosciences)
Tejos, Eduardo (Universidad Católica de la Santísima Concepción)
Villanueva, Joan (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Wang, Huanye (Chinese Academy of Sciences. Institute of Earth Environment)
Werne, Josef (Stockholm University. Department of Geological Sciences)
Yamamoto, Masanobu (Hokkaido University. Department of Earth System Science)
Yang, Huan (China University of Geosciences)
Zhou, Aifeng (Lanzhou University. Collaborative Innovation Centre for Arid Environments and Climate Change)

Fecha:	2024
Resumen:	Ratios of glycerol dialkyl glycerol tetraethers (GDGT), which are membrane lipids of bacteria and archaea, are at the base of several paleoenvironmental proxies. They are frequently applied to soils as well as lake- and marine sediments to generate records of past temperature and soil pH. To derive meaningful environmental information from these reconstructions, high analytical reproducibility is required. Based on submitted results by 39 laboratories from across the world, which employ a diverse range of analytical and quantification methods, we explored the reproducibility of brGDGT-based proxies (MBT'5ME, IR, and #ringstetra) measured on four soil samples and four soil lipid extracts. Correct identification and integration of 5- and 6-methyl brGDGTs is a prerequisite for the robust calculation of proxy values, but this can be challenging as indicated by the large inter-interlaboratory variation. The exclusion of statistical outliers improves the reproducibility, where the remaining uncertainty translates into a temperature offset from median proxy values of 0. 3-0. 9°C and a pH offset of 0. 05-0. 3. There is no apparent systematic impact of the extraction method and sample preparation steps on the brGDGT ratios. Although reported GDGT concentrations are generally consistent within laboratories, they vary greatly between laboratories. This large variability in brGDGT quantification may relate to variations in ionization efficiency or specific mass spectrometer settings possibly impacting the response of brGDGTs masses relative to that of the internal standard used. While ratio values of GDGT are generally comparable, quantities can currently not be compared between laboratories.
Ayudas:	European Commission 771497
Nota:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	GDGT ; Interlaboratory comparison ; Round robin ; SDG 14 - Life Below Water
Publicado en:	Geochemistry, geophysics, geosystems, Vol. 25, Issue 7 (July 2024) , art. e2024GC011583, ISSN 1525-2027

DOI: 10.1029/2024GC011583

17 p, 1.2 MB

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