Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments : results of an interlaboratory comparison study
Rosell Melé, Antoni (University of Durham. Department of Geography)
Bard, Edouard (Université d'Aix-Marseille III. Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement)
Emeis, K.-C. (Institut für Ostseeforschung Warnemünde (Warnemünde, Alemanya))
Grimalt, Joan (Institut de Diagnosi Ambiental i Estudis de l'Aigua)
Müller, P. (Universität Bremen. Fachbereich Geowissenschaften)
Schneider, R. (Universität Bremen. Fachbereich Geowissenschaften)
Bouloubassi, I. (Université Pierre et Marie Curie. Laboratoire de Physique et Chimie Marines)
Epstein, B. (University of Rhode Island. Graduate School of Oceanography)
Fahl, K. (Alfred-Wegener-Institut für Polar- und Meeresforschung)
Fluegge, A. (Alfred-Wegener-Institut für Polar- und Meeresforschung)
Freeman, K. (Pennsylvania State University. Department of Geosciences)
Goñi, Miguel (University of South Carolina. Department of Geological Sciences)
Güntner, U. (University of Oldenburg. Institut für Chemie und Biologie des Meeres)
Hartz, D. (University of South Carolina. Department of Geological Sciences)
Hellebust, S. (University of Newcastle. Department Fossil Fuels and Environmental Geochemistry)
Herbert, T. (Brown University. Department of Geological Sciences)
Ikehara, M. (Hokkaido University. Institute Low Temperature Science)
Ishiwatari, R. (Tokyo Metropolitan University. Department of Chemistry)
Kawamura, K. (Hokkaido University. Institute Low Temperature Science)
Kenig, F. (University of Illinois at Chicago. Department of Geological Sciences)
de Leeuw, J. (Netherlands Institute for Sea Research. Department of Organic Geochemistry and Toxicology)
Lehman, S. (University of Colorado. Insitute of Arctic and Alpine Research)
Mejanelle, L. (Université Pierre et Marie Curie. Laboratoire de Physique et Chimie Marines)
Ohkouchi, N. (Hokkaido University. Institute Low Temperature Science)
Pancost, R. D. (Pennsylvania State University. Department of Geosciences)
Pelejero, Carles (Institut de Diagnosi Ambiental i Estudis de l'Aigua)
Prahl, F. (Oregon State University. College of Oceanic and Atmospheric Sciences)
Quinn, J. (University of Rhode Island. Graduate School of Oceanography)
Rontani, J. -F. (Centre d'Océanologie de Marseille)
Rostek, F. (Université d'Aix-Marseille III. Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement)
Rullkötter, J. (Carl von Ossietzky Universität Oldenburg. Institut für Chemie und Biologie des Meeres)
Sachs, J. (University of Colorado. Insitute of Arctic and Alpine Research)
Blanz, T. (Institut für Meereskunde - Meereschemie (Kiel, Alemanya))
Sawada, K. (University of Tsukuba (Japó). Department of Chemistry)
Schulz-Bull, D. (Institut für Meereskunde - Meereschemie (Kiel, Alemanya))
Sikes, E. (University of Auckland. School of Environmental and Marine Sciences)
Sonzogni, C. (Université d'Aix-Marseille III. Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement)
Ternois, Y. (Hokkaido University. Institute Low Temperature Science)
Versteegh, G. (Netherlands Institute for Sea Research. Department of Organic Geochemistry and Toxicology)
Volkman, J. K. (CSIRO Marine Research (Hobart, Austràlia))
Wakeham, S. (Skidaway Institute of Oceanography (Savannah, Estats Units d'Amèrica))

Data:	2001
Resum:	Measurements of the UK'37 index and the absolute abundance of alkenones in marine sediments are increasingly used in paleoceanographic research as proxies of past sea surface temperature and haptophyte (mainly coccolith-bearing species) primary productivity, respectively. An important aspect of these studies is to be able to compare reliably data obtained by different laboratories from a wide variety of locations. Hence the intercomparability of data produced by the research community is essential. Here we report results from an anonymous interlaboratory comparison study involving 24 of the leading laboratories that carry out alkenone measurements worldwide. The majority of laboratories produce data that are intercomparable within the considered confidence limits. For the measurement of alkenone concentrations, however, there are systematic biases between laboratories, which might be related to the techniques employed to quantify the components. The maximum difference between any two laboratories for any two single measurements of UK'37 in sediments is estimated, with a probability of 95%, to be <2. 18C. In addition, the overall within-laboratory precision for the UK'37 temperature estimates is estimated to be <1. 68C (95% probability). Similarly, from the analyses of alkenone concentrations the interlaboratory reproducibility is estimated at 32%, and the repeatability is estimated at 24%. The former is compared to a theoretical estimate of reproducibility and found to be excessively high. Hence there is certainly scope and a demonstrable need to improve reproducibility and repeatability of UK'37 and especially alkenone quantification data across the community of scientists involved in alkenone research.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Alkenones ; UK 37 ; Interlaboratory comparison
Publicat a:	Geochemistry, geophysics, geosystems, Vol. 2 (July 2001) , p. 1-28, ISSN 1525-2027

DOI: 10.1029/2000GC000141

28 p, 531.3 KB

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