Precision of the current methods to measure the alkenone proxy U37K′ and absolute alkenone abundance in sediments: Results of an interlaboratory comparison study
Identifieur interne : 001A85 ( Istex/Curation ); précédent : 001A84; suivant : 001A86Precision of the current methods to measure the alkenone proxy U37K′ and absolute alkenone abundance in sediments: Results of an interlaboratory comparison study
Auteurs : A. Rosell-Melé [Royaume-Uni] ; E. Bard [France] ; K. Emeis [Allemagne] ; J. O. Grimalt [Espagne] ; P. Müller [Allemagne] ; R. Schneider [Allemagne] ; I. Bouloubassi [France] ; B. Epstein [États-Unis] ; K. Fahl [Allemagne] ; A. Fluegge [Allemagne] ; K. Freeman [États-Unis] ; M. Go I [États-Unis] ; U. Güntner [Allemagne] ; D. Hartz [États-Unis] ; S. Hellebust [Royaume-Uni] ; T. Herbert [États-Unis] ; M. Ikehara [Japon] ; R. Ishiwatari [Japon] ; K. Kawamura [Japon] ; F. Kenig [États-Unis] ; J. De Leeuw [Pays-Bas] ; S. Lehman [États-Unis] ; L. Mejanelle [France] ; N. Ohkouchi [Japon] ; R. D. Pancost [États-Unis] ; C. Pelejero [Espagne] ; F. Prahl [États-Unis] ; J. Quinn [États-Unis] ; J. Rontani [France] ; F. Rostek [France] ; J. Rullkötter [Allemagne] ; J. Sachs [États-Unis] ; T. Blanz [Allemagne] ; K. Sawada [Japon] ; D. Schulz-Bull [Allemagne] ; E. Sikes [Nouvelle-Zélande] ; C. Sonzogni [France] ; Y. Ternois [Japon] ; G. Versteegh [Pays-Bas] ; J. K. Volkman [Australie] ; S. Wakeham [États-Unis]Source :
- Geochemistry, Geophysics, Geosystems [ 1525-2027 ] ; 2001-07.
Descripteurs français
- Wicri :
- topic : Géochimie, Géophysique.
English descriptors
- KwdEn :
- 5eme etage, Absolute abundance, Absolute difference, Alkenone, Alkenone concentrations, Alkenone proxy, Alkenone research, Alkenone standards, Alkenones, Alkenones interlaboratory comparison, Alpine research, Ammonia chemical ionization mass chromatograms, Anal, Analytical methodology, Analytical methods, Anonymous interlaboratory comparison study, Anova, Barcelona catalonia, Base peak, Base peak representation, Best values, Boulder colorado, Chem, Chimie marines, Chromatogram, Chromatographic analysis, Chromatographic system, Cleanup, Cleanup step, Climap project members, Collaborative trials, Confidence level, Current methods, Degrees celsius, Different laboratories, Dissimilar results, Geochemistry, Geochemistry geophysics geosystems, Geological sciences, Geophysics, Geosystems, Grimalt, Groups sediment, High value, Higher values, Hokkaido, Hokkaido university, Horrat values, Horwitz, Horwitz equation, Important aspect, Interlaboratory, Interlaboratory comparison, Interlaboratory comparison study, Interlaboratory evaluation, Interlaboratory reproducibility, Interlaboratory tests, Interlaboratory variability, Interlaboratory variance, International standardisation organisation, International union, Intralaboratory variance, John wiley, Jordi girona, Laboratory code figure, Lowest values, Main cluster, Main ions intensity, Marie curie, Marine research, Marine sediments, Mass spectrometry, Median, Meereskunde meereschemie, Minutes figure, Netherlands institute, Normal distribution, Organic geochemistry, Outlier, Paper number, Paris cedex, Particular laboratory, Pelagic conditions, Pennsylvania state university, Place jussieu, Present study, Pseudomolecular ions, Pure appl, Real value, Reconstructed chromatogram, Relative abundance, Repeatability, Repeatability limit, Reproducibility, Reproducibility conditions, Reproducibility limit, Rhode island, Rsdr, Same sign, Sample cleanup, Sediment, Sediment samples, Sediment test samples, Significant differences, Similar values, Single results, Solid curve, Squares degrees freedom, Standard deviation, Standard mixtures, Statistical evaluation, Statistical methods, Statistical parameters, Surface temperature, Surface temperatures, Systematic biases, Temperature difference, Temperature estimates, Temperature science, Test samples, Tukey post, Ultrasound, Universite pierre, University park, Values number, Values sample, Variance, Vertical axis, Villanueva, Wide variety, Youden plots.
- Teeft :
- 5eme etage, Absolute abundance, Absolute difference, Alkenone, Alkenone concentrations, Alkenone proxy, Alkenone research, Alkenone standards, Alkenones, Alkenones interlaboratory comparison, Alpine research, Ammonia chemical ionization mass chromatograms, Anal, Analytical methodology, Analytical methods, Anonymous interlaboratory comparison study, Anova, Barcelona catalonia, Base peak, Base peak representation, Best values, Boulder colorado, Chem, Chimie marines, Chromatogram, Chromatographic analysis, Chromatographic system, Cleanup, Cleanup step, Climap project members, Collaborative trials, Confidence level, Current methods, Degrees celsius, Different laboratories, Dissimilar results, Geochemistry, Geochemistry geophysics geosystems, Geological sciences, Geophysics, Geosystems, Grimalt, Groups sediment, High value, Higher values, Hokkaido, Hokkaido university, Horrat values, Horwitz, Horwitz equation, Important aspect, Interlaboratory, Interlaboratory comparison, Interlaboratory comparison study, Interlaboratory evaluation, Interlaboratory reproducibility, Interlaboratory tests, Interlaboratory variability, Interlaboratory variance, International standardisation organisation, International union, Intralaboratory variance, John wiley, Jordi girona, Laboratory code figure, Lowest values, Main cluster, Main ions intensity, Marie curie, Marine research, Marine sediments, Mass spectrometry, Median, Meereskunde meereschemie, Minutes figure, Netherlands institute, Normal distribution, Organic geochemistry, Outlier, Paper number, Paris cedex, Particular laboratory, Pelagic conditions, Pennsylvania state university, Place jussieu, Present study, Pseudomolecular ions, Pure appl, Real value, Reconstructed chromatogram, Relative abundance, Repeatability, Repeatability limit, Reproducibility, Reproducibility conditions, Reproducibility limit, Rhode island, Rsdr, Same sign, Sample cleanup, Sediment, Sediment samples, Sediment test samples, Significant differences, Similar values, Single results, Solid curve, Squares degrees freedom, Standard deviation, Standard mixtures, Statistical evaluation, Statistical methods, Statistical parameters, Surface temperature, Surface temperatures, Systematic biases, Temperature difference, Temperature estimates, Temperature science, Test samples, Tukey post, Ultrasound, Universite pierre, University park, Values number, Values sample, Variance, Vertical axis, Villanueva, Wide variety, Youden plots.
Abstract
Measurements of the U37K′ 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 U37K′ in sediments is estimated, with a probability of 95%, to be <2.1°C. In addition, the overall within‐laboratory precision for the U37K′ temperature estimates is estimated to be <1.6°C (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 U37K′ and especially alkenone quantification data across the community of scientists involved in alkenone research.
Url:
DOI: 10.1029/2000GC000141
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Hartz</name><affiliation wicri:level="1"><mods:affiliation>Department of Geological Sciences, University of South Carolina, South Carolina, 29208, Columbia, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geological Sciences, University of South Carolina, South Carolina, 29208, Columbia</wicri:regionArea></affiliation></author><author><name sortKey="Hellebust, S" sort="Hellebust, S" uniqKey="Hellebust S" first="S." last="Hellebust">S. 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Ishiwatari</name><affiliation wicri:level="1"><mods:affiliation>Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Minami‐Ohsawa 1‐1,, 192‐03, Hachoji, Tokyo, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Minami‐Ohsawa 1‐1,, 192‐03, Hachoji, Tokyo</wicri:regionArea></affiliation></author><author><name sortKey="Kawamura, K" sort="Kawamura, K" uniqKey="Kawamura K" first="K." last="Kawamura">K. Kawamura</name><affiliation wicri:level="1"><mods:affiliation>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo</wicri:regionArea></affiliation></author><author><name sortKey="Kenig, F" sort="Kenig, F" uniqKey="Kenig F" first="F." last="Kenig">F. Kenig</name><affiliation wicri:level="1"><mods:affiliation>Department of Geological Sciences, University of Illinois at Chicago, 845 W Taylor Street,, Illinois, 60607‐7059, Chicago, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geological Sciences, University of Illinois at Chicago, 845 W Taylor Street,, Illinois, 60607‐7059, Chicago</wicri:regionArea></affiliation></author><author><name sortKey="De Leeuw, J" sort="De Leeuw, J" uniqKey="De Leeuw J" first="J." last="De Leeuw">J. De Leeuw</name><affiliation wicri:level="1"><mods:affiliation>Department of Organic Geochemistry and Toxicology, Netherlands Institute for Sea Research, P.O. Box 59,, Texel, 1790 AB, Den Burg, Netherlands</mods:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Department of Organic Geochemistry and Toxicology, Netherlands Institute for Sea Research, P.O. Box 59,, Texel, 1790 AB, Den Burg</wicri:regionArea></affiliation></author><author><name sortKey="Lehman, S" sort="Lehman, S" uniqKey="Lehman S" first="S." last="Lehman">S. Lehman</name><affiliation wicri:level="1"><mods:affiliation>Insitute of Arctic and Alpine Research, University of Colorado, Campus Box 450,, Colorado, 80309, Boulder, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Insitute of Arctic and Alpine Research, University of Colorado, Campus Box 450,, Colorado, 80309, Boulder</wicri:regionArea></affiliation></author><author><name sortKey="Mejanelle, L" sort="Mejanelle, L" uniqKey="Mejanelle L" first="L." last="Mejanelle">L. Mejanelle</name><affiliation wicri:level="1"><mods:affiliation>Laboratoire de Physique et Chimie Marines, Université Pierre et Marie Curie, Case 134, Tour 25, 5ème étage, 4 place Jussieu,, F‐75252, Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Physique et Chimie Marines, Université Pierre et Marie Curie, Case 134, Tour 25, 5ème étage, 4 place Jussieu,, F‐75252, Paris Cedex 05</wicri:regionArea></affiliation></author><author><name sortKey="Ohkouchi, N" sort="Ohkouchi, N" uniqKey="Ohkouchi N" first="N." last="Ohkouchi">N. Ohkouchi</name><affiliation wicri:level="1"><mods:affiliation>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo</wicri:regionArea></affiliation></author><author><name sortKey="Pancost, R D" sort="Pancost, R D" uniqKey="Pancost R" first="R. D." last="Pancost">R. D. Pancost</name><affiliation wicri:level="1"><mods:affiliation>Department of Geosciences, Pennsylvania State University, Pennsylvania, 16802, University Park, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geosciences, Pennsylvania State University, Pennsylvania, 16802, University Park</wicri:regionArea></affiliation></author><author><name sortKey="Pelejero, C" sort="Pelejero, C" uniqKey="Pelejero C" first="C." last="Pelejero">C. Pelejero</name><affiliation wicri:level="1"><mods:affiliation>Departamento Química Ambiental, CID‐CSIC, Jordi Girona 18,, Catalonia, E‐08034, Barcelona, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Departamento Química Ambiental, CID‐CSIC, Jordi Girona 18,, Catalonia, E‐08034, Barcelona</wicri:regionArea></affiliation></author><author><name sortKey="Prahl, F" sort="Prahl, F" uniqKey="Prahl F" first="F." last="Prahl">F. Prahl</name><affiliation wicri:level="1"><mods:affiliation>College of Oceanic and Atmospheric Sciences, Oregon State University, Oregon, 97331, Corvallis, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>College of Oceanic and Atmospheric Sciences, Oregon State University, Oregon, 97331, Corvallis</wicri:regionArea></affiliation></author><author><name sortKey="Quinn, J" sort="Quinn, J" uniqKey="Quinn J" first="J." last="Quinn">J. Quinn</name><affiliation wicri:level="1"><mods:affiliation>Graduate School of Oceanography, University of Rhode Island, Rhode Island, 02882‐1197, Narragansett, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Graduate School of Oceanography, University of Rhode Island, Rhode Island, 02882‐1197, Narragansett</wicri:regionArea></affiliation></author><author><name sortKey="Rontani, J" sort="Rontani, J" uniqKey="Rontani J" first="J." last="Rontani">J. Rontani</name><affiliation wicri:level="1"><mods:affiliation>Laboratoire d'Océanographie et de Biogéochimie (UMR 6535), Centre d'Océanologie de Marseille (OSU), Faculté des Sciences de Luminy ‐ case 901, F‐13288, Marseille, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Océanographie et de Biogéochimie (UMR 6535), Centre d'Océanologie de Marseille (OSU), Faculté des Sciences de Luminy ‐ case 901, F‐13288, Marseille</wicri:regionArea></affiliation></author><author><name sortKey="Rostek, F" sort="Rostek, F" uniqKey="Rostek F" first="F." last="Rostek">F. Rostek</name><affiliation wicri:level="1"><mods:affiliation>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4</wicri:regionArea></affiliation></author><author><name sortKey="Rullkotter, J" sort="Rullkotter, J" uniqKey="Rullkotter J" first="J." last="Rullkötter">J. Rullkötter</name><affiliation wicri:level="1"><mods:affiliation>Institut für Chemie und Biologie des Meeres, University of Oldenburg, P.O. Box 2503,, D‐26111, Oldenburg, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Chemie und Biologie des Meeres, University of Oldenburg, P.O. Box 2503,, D‐26111, Oldenburg</wicri:regionArea></affiliation></author><author><name sortKey="Sachs, J" sort="Sachs, J" uniqKey="Sachs J" first="J." last="Sachs">J. Sachs</name><affiliation wicri:level="1"><mods:affiliation>Insitute of Arctic and Alpine Research, University of Colorado, Campus Box 450,, Colorado, 80309, Boulder, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Insitute of Arctic and Alpine Research, University of Colorado, Campus Box 450,, Colorado, 80309, Boulder</wicri:regionArea></affiliation></author><author><name sortKey="Blanz, T" sort="Blanz, T" uniqKey="Blanz T" first="T." last="Blanz">T. Blanz</name><affiliation wicri:level="1"><mods:affiliation>Institut für Meereskunde ‐ Meereschemie, Duesternbrooker Weg 20,, D‐24105, Kiel, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Meereskunde ‐ Meereschemie, Duesternbrooker Weg 20,, D‐24105, Kiel</wicri:regionArea></affiliation></author><author><name sortKey="Sawada, K" sort="Sawada, K" uniqKey="Sawada K" first="K." last="Sawada">K. Sawada</name><affiliation wicri:level="1"><mods:affiliation>Department of Chemistry, University of Tsukuba, 305‐8571, Tsukuba, Ibaraki, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Chemistry, University of Tsukuba, 305‐8571, Tsukuba, Ibaraki</wicri:regionArea></affiliation></author><author><name sortKey="Schulz Ull, D" sort="Schulz Ull, D" uniqKey="Schulz Ull D" first="D." last="Schulz-Bull">D. Schulz-Bull</name><affiliation wicri:level="1"><mods:affiliation>Institut für Meereskunde ‐ Meereschemie, Duesternbrooker Weg 20,, D‐24105, Kiel, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Meereskunde ‐ Meereschemie, Duesternbrooker Weg 20,, D‐24105, Kiel</wicri:regionArea></affiliation></author><author><name sortKey="Sikes, E" sort="Sikes, E" uniqKey="Sikes E" first="E." last="Sikes">E. Sikes</name><affiliation wicri:level="1"><mods:affiliation>School of Environmental and Marine Sciences, University of Auckland, Private Bag 92019,, Auckland, New Zealand</mods:affiliation><country xml:lang="fr">Nouvelle-Zélande</country><wicri:regionArea>School of Environmental and Marine Sciences, University of Auckland, Private Bag 92019,, Auckland</wicri:regionArea></affiliation></author><author><name sortKey="Sonzogni, C" sort="Sonzogni, C" uniqKey="Sonzogni C" first="C." last="Sonzogni">C. Sonzogni</name><affiliation wicri:level="1"><mods:affiliation>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4</wicri:regionArea></affiliation></author><author><name sortKey="Ternois, Y" sort="Ternois, Y" uniqKey="Ternois Y" first="Y." last="Ternois">Y. Ternois</name><affiliation wicri:level="1"><mods:affiliation>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo</wicri:regionArea></affiliation></author><author><name sortKey="Versteegh, G" sort="Versteegh, G" uniqKey="Versteegh G" first="G." last="Versteegh">G. Versteegh</name><affiliation wicri:level="1"><mods:affiliation>Department of Organic Geochemistry and Toxicology, Netherlands Institute for Sea Research, P.O. Box 59,, Texel, 1790 AB, Den Burg, Netherlands</mods:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Department of Organic Geochemistry and Toxicology, Netherlands Institute for Sea Research, P.O. Box 59,, Texel, 1790 AB, Den Burg</wicri:regionArea></affiliation></author><author><name sortKey="Volkman, J K" sort="Volkman, J K" uniqKey="Volkman J" first="J. K." last="Volkman">J. K. Volkman</name><affiliation wicri:level="1"><mods:affiliation>CSIRO Marine Research, GPO Box 1538,, Tasmania, 7001, Hobart, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>CSIRO Marine Research, GPO Box 1538,, Tasmania, 7001, Hobart</wicri:regionArea></affiliation></author><author><name sortKey="Wakeham, S" sort="Wakeham, S" uniqKey="Wakeham S" first="S." last="Wakeham">S. Wakeham</name><affiliation wicri:level="1"><mods:affiliation>Skidaway Institute of Oceanography, 10 Ocean Science Circle,, Georgia, 31411, Savannah, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Skidaway Institute of Oceanography, 10 Ocean Science Circle,, Georgia, 31411, Savannah</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:8E38458741C90F811682F9DA6A283D6AE4594DA7</idno><date when="2001" year="2001">2001</date><idno type="doi">10.1029/2000GC000141</idno><idno type="url">https://api.istex.fr/document/8E38458741C90F811682F9DA6A283D6AE4594DA7/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001A85</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001A85</idno><idno type="wicri:Area/Istex/Curation">001A85</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main">Precision of the current methods to measure the alkenone proxy U<hi rend="subscript">37</hi><hi rend="superscript">K′</hi> and absolute alkenone abundance in sediments: Results of an interlaboratory comparison study</title><author><name sortKey="Rosell Ele, A" sort="Rosell Ele, A" uniqKey="Rosell Ele A" first="A." last="Rosell-Melé">A. Rosell-Melé</name><affiliation wicri:level="1"><mods:affiliation>E-mail: antoni.rosell@durham.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation><affiliation wicri:level="1"><mods:affiliation>Department of Geography, University of Durham, DH1 3LE, Durham, England, UK</mods:affiliation><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Geography, University of Durham, DH1 3LE, Durham, England</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: antoni.rosell@durham.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation></author><author><name sortKey="Bard, E" sort="Bard, E" uniqKey="Bard E" first="E." last="Bard">E. Bard</name><affiliation wicri:level="1"><mods:affiliation>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4</wicri:regionArea></affiliation></author><author><name sortKey="Emeis, K" sort="Emeis, K" uniqKey="Emeis K" first="K." last="Emeis">K. Emeis</name><affiliation wicri:level="1"><mods:affiliation>Institut für Ostseeforschung Warnemünde, Seestrasse 15,, D‐18119, Warnemünde, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Ostseeforschung Warnemünde, Seestrasse 15,, D‐18119, Warnemünde</wicri:regionArea></affiliation></author><author><name sortKey="Grimalt, J O" sort="Grimalt, J O" uniqKey="Grimalt J" first="J. O." last="Grimalt">J. O. Grimalt</name><affiliation wicri:level="1"><mods:affiliation>Departamento Química Ambiental, CID‐CSIC, Jordi Girona 18,, Catalonia, E‐08034, Barcelona, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Departamento Química Ambiental, CID‐CSIC, Jordi Girona 18,, Catalonia, E‐08034, Barcelona</wicri:regionArea></affiliation></author><author><name sortKey="Muller, P" sort="Muller, P" uniqKey="Muller P" first="P." last="Müller">P. Müller</name><affiliation wicri:level="1"><mods:affiliation>Fachbereich Geowissenschaften, Universität Bremen, FB 5 ‐ Geowissenschaften,Postfach 330 440,, D‐28334, Bremen, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Fachbereich Geowissenschaften, Universität Bremen, FB 5 ‐ Geowissenschaften,Postfach 330 440,, D‐28334, Bremen</wicri:regionArea></affiliation></author><author><name sortKey="Schneider, R" sort="Schneider, R" uniqKey="Schneider R" first="R." last="Schneider">R. Schneider</name><affiliation wicri:level="1"><mods:affiliation>Fachbereich Geowissenschaften, Universität Bremen, FB 5 ‐ Geowissenschaften,Postfach 330 440,, D‐28334, Bremen, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Fachbereich Geowissenschaften, Universität Bremen, FB 5 ‐ Geowissenschaften,Postfach 330 440,, D‐28334, Bremen</wicri:regionArea></affiliation></author><author><name sortKey="Bouloubassi, I" sort="Bouloubassi, I" uniqKey="Bouloubassi I" first="I." last="Bouloubassi">I. Bouloubassi</name><affiliation wicri:level="1"><mods:affiliation>Laboratoire de Physique et Chimie Marines, Université Pierre et Marie Curie, Case 134, Tour 25, 5ème étage, 4 place Jussieu,, F‐75252, Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Physique et Chimie Marines, Université Pierre et Marie Curie, Case 134, Tour 25, 5ème étage, 4 place Jussieu,, F‐75252, Paris Cedex 05</wicri:regionArea></affiliation></author><author><name sortKey="Epstein, B" sort="Epstein, B" uniqKey="Epstein B" first="B." last="Epstein">B. Epstein</name><affiliation wicri:level="1"><mods:affiliation>Graduate School of Oceanography, University of Rhode Island, Rhode Island, 02882‐1197, Narragansett, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Graduate School of Oceanography, University of Rhode Island, Rhode Island, 02882‐1197, Narragansett</wicri:regionArea></affiliation></author><author><name sortKey="Fahl, K" sort="Fahl, K" uniqKey="Fahl K" first="K." last="Fahl">K. Fahl</name><affiliation wicri:level="1"><mods:affiliation>Alfred‐Wegener‐Institute for Polar and Marine Research, Columbusstrasse,, D‐27568, Bremerhaven, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Alfred‐Wegener‐Institute for Polar and Marine Research, Columbusstrasse,, D‐27568, Bremerhaven</wicri:regionArea></affiliation></author><author><name sortKey="Fluegge, A" sort="Fluegge, A" uniqKey="Fluegge A" first="A." last="Fluegge">A. Fluegge</name><affiliation wicri:level="1"><mods:affiliation>Alfred‐Wegener‐Inst. for Polar and Marine Research, Am Handelshafen 12,, D‐27570, Bremerhaven, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Alfred‐Wegener‐Inst. for Polar and Marine Research, Am Handelshafen 12,, D‐27570, Bremerhaven</wicri:regionArea></affiliation></author><author><name sortKey="Freeman, K" sort="Freeman, K" uniqKey="Freeman K" first="K." last="Freeman">K. Freeman</name><affiliation wicri:level="1"><mods:affiliation>Department of Geosciences, Pennsylvania State University, Pennsylvania, 16802, University Park, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geosciences, Pennsylvania State University, Pennsylvania, 16802, University Park</wicri:regionArea></affiliation></author><author><name sortKey="Go I, M" sort="Go I, M" uniqKey="Go I M" first="M." last="Go I">M. Go I</name><affiliation wicri:level="1"><mods:affiliation>Department of Geological Sciences, University of South Carolina, South Carolina, 29208, Columbia, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geological Sciences, University of South Carolina, South Carolina, 29208, Columbia</wicri:regionArea></affiliation></author><author><name sortKey="Guntner, U" sort="Guntner, U" uniqKey="Guntner U" first="U." last="Güntner">U. Güntner</name><affiliation wicri:level="1"><mods:affiliation>Institut für Chemie und Biologie des Meeres, University of Oldenburg, P.O. Box 2503,, D‐26111, Oldenburg, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Chemie und Biologie des Meeres, University of Oldenburg, P.O. Box 2503,, D‐26111, Oldenburg</wicri:regionArea></affiliation></author><author><name sortKey="Hartz, D" sort="Hartz, D" uniqKey="Hartz D" first="D." last="Hartz">D. Hartz</name><affiliation wicri:level="1"><mods:affiliation>Department of Geological Sciences, University of South Carolina, South Carolina, 29208, Columbia, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geological Sciences, University of South Carolina, South Carolina, 29208, Columbia</wicri:regionArea></affiliation></author><author><name sortKey="Hellebust, S" sort="Hellebust, S" uniqKey="Hellebust S" first="S." last="Hellebust">S. Hellebust</name><affiliation wicri:level="1"><mods:affiliation>Department Fossil Fuels and Environmental Geochemistry, University of Newcastle, England, NE1 7RU, Newcastle upon Tyne, UK</mods:affiliation><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department Fossil Fuels and Environmental Geochemistry, University of Newcastle, England, NE1 7RU, Newcastle upon Tyne</wicri:regionArea></affiliation></author><author><name sortKey="Herbert, T" sort="Herbert, T" uniqKey="Herbert T" first="T." last="Herbert">T. Herbert</name><affiliation wicri:level="1"><mods:affiliation>Department of Geological Sciences, Brown University, Box 1846,, Rhode Island, 02912, Providence, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geological Sciences, Brown University, Box 1846,, Rhode Island, 02912, Providence</wicri:regionArea></affiliation></author><author><name sortKey="Ikehara, M" sort="Ikehara, M" uniqKey="Ikehara M" first="M." last="Ikehara">M. Ikehara</name><affiliation wicri:level="1"><mods:affiliation>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo</wicri:regionArea></affiliation></author><author><name sortKey="Ishiwatari, R" sort="Ishiwatari, R" uniqKey="Ishiwatari R" first="R." last="Ishiwatari">R. Ishiwatari</name><affiliation wicri:level="1"><mods:affiliation>Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Minami‐Ohsawa 1‐1,, 192‐03, Hachoji, Tokyo, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Minami‐Ohsawa 1‐1,, 192‐03, Hachoji, Tokyo</wicri:regionArea></affiliation></author><author><name sortKey="Kawamura, K" sort="Kawamura, K" uniqKey="Kawamura K" first="K." last="Kawamura">K. Kawamura</name><affiliation wicri:level="1"><mods:affiliation>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo</wicri:regionArea></affiliation></author><author><name sortKey="Kenig, F" sort="Kenig, F" uniqKey="Kenig F" first="F." last="Kenig">F. Kenig</name><affiliation wicri:level="1"><mods:affiliation>Department of Geological Sciences, University of Illinois at Chicago, 845 W Taylor Street,, Illinois, 60607‐7059, Chicago, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geological Sciences, University of Illinois at Chicago, 845 W Taylor Street,, Illinois, 60607‐7059, Chicago</wicri:regionArea></affiliation></author><author><name sortKey="De Leeuw, J" sort="De Leeuw, J" uniqKey="De Leeuw J" first="J." last="De Leeuw">J. De Leeuw</name><affiliation wicri:level="1"><mods:affiliation>Department of Organic Geochemistry and Toxicology, Netherlands Institute for Sea Research, P.O. Box 59,, Texel, 1790 AB, Den Burg, Netherlands</mods:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Department of Organic Geochemistry and Toxicology, Netherlands Institute for Sea Research, P.O. Box 59,, Texel, 1790 AB, Den Burg</wicri:regionArea></affiliation></author><author><name sortKey="Lehman, S" sort="Lehman, S" uniqKey="Lehman S" first="S." last="Lehman">S. Lehman</name><affiliation wicri:level="1"><mods:affiliation>Insitute of Arctic and Alpine Research, University of Colorado, Campus Box 450,, Colorado, 80309, Boulder, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Insitute of Arctic and Alpine Research, University of Colorado, Campus Box 450,, Colorado, 80309, Boulder</wicri:regionArea></affiliation></author><author><name sortKey="Mejanelle, L" sort="Mejanelle, L" uniqKey="Mejanelle L" first="L." last="Mejanelle">L. Mejanelle</name><affiliation wicri:level="1"><mods:affiliation>Laboratoire de Physique et Chimie Marines, Université Pierre et Marie Curie, Case 134, Tour 25, 5ème étage, 4 place Jussieu,, F‐75252, Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Physique et Chimie Marines, Université Pierre et Marie Curie, Case 134, Tour 25, 5ème étage, 4 place Jussieu,, F‐75252, Paris Cedex 05</wicri:regionArea></affiliation></author><author><name sortKey="Ohkouchi, N" sort="Ohkouchi, N" uniqKey="Ohkouchi N" first="N." last="Ohkouchi">N. Ohkouchi</name><affiliation wicri:level="1"><mods:affiliation>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo</wicri:regionArea></affiliation></author><author><name sortKey="Pancost, R D" sort="Pancost, R D" uniqKey="Pancost R" first="R. D." last="Pancost">R. D. Pancost</name><affiliation wicri:level="1"><mods:affiliation>Department of Geosciences, Pennsylvania State University, Pennsylvania, 16802, University Park, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geosciences, Pennsylvania State University, Pennsylvania, 16802, University Park</wicri:regionArea></affiliation></author><author><name sortKey="Pelejero, C" sort="Pelejero, C" uniqKey="Pelejero C" first="C." last="Pelejero">C. Pelejero</name><affiliation wicri:level="1"><mods:affiliation>Departamento Química Ambiental, CID‐CSIC, Jordi Girona 18,, Catalonia, E‐08034, Barcelona, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Departamento Química Ambiental, CID‐CSIC, Jordi Girona 18,, Catalonia, E‐08034, Barcelona</wicri:regionArea></affiliation></author><author><name sortKey="Prahl, F" sort="Prahl, F" uniqKey="Prahl F" first="F." last="Prahl">F. Prahl</name><affiliation wicri:level="1"><mods:affiliation>College of Oceanic and Atmospheric Sciences, Oregon State University, Oregon, 97331, Corvallis, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>College of Oceanic and Atmospheric Sciences, Oregon State University, Oregon, 97331, Corvallis</wicri:regionArea></affiliation></author><author><name sortKey="Quinn, J" sort="Quinn, J" uniqKey="Quinn J" first="J." last="Quinn">J. Quinn</name><affiliation wicri:level="1"><mods:affiliation>Graduate School of Oceanography, University of Rhode Island, Rhode Island, 02882‐1197, Narragansett, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Graduate School of Oceanography, University of Rhode Island, Rhode Island, 02882‐1197, Narragansett</wicri:regionArea></affiliation></author><author><name sortKey="Rontani, J" sort="Rontani, J" uniqKey="Rontani J" first="J." last="Rontani">J. Rontani</name><affiliation wicri:level="1"><mods:affiliation>Laboratoire d'Océanographie et de Biogéochimie (UMR 6535), Centre d'Océanologie de Marseille (OSU), Faculté des Sciences de Luminy ‐ case 901, F‐13288, Marseille, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Océanographie et de Biogéochimie (UMR 6535), Centre d'Océanologie de Marseille (OSU), Faculté des Sciences de Luminy ‐ case 901, F‐13288, Marseille</wicri:regionArea></affiliation></author><author><name sortKey="Rostek, F" sort="Rostek, F" uniqKey="Rostek F" first="F." last="Rostek">F. Rostek</name><affiliation wicri:level="1"><mods:affiliation>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4</wicri:regionArea></affiliation></author><author><name sortKey="Rullkotter, J" sort="Rullkotter, J" uniqKey="Rullkotter J" first="J." last="Rullkötter">J. Rullkötter</name><affiliation wicri:level="1"><mods:affiliation>Institut für Chemie und Biologie des Meeres, University of Oldenburg, P.O. Box 2503,, D‐26111, Oldenburg, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Chemie und Biologie des Meeres, University of Oldenburg, P.O. Box 2503,, D‐26111, Oldenburg</wicri:regionArea></affiliation></author><author><name sortKey="Sachs, J" sort="Sachs, J" uniqKey="Sachs J" first="J." last="Sachs">J. Sachs</name><affiliation wicri:level="1"><mods:affiliation>Insitute of Arctic and Alpine Research, University of Colorado, Campus Box 450,, Colorado, 80309, Boulder, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Insitute of Arctic and Alpine Research, University of Colorado, Campus Box 450,, Colorado, 80309, Boulder</wicri:regionArea></affiliation></author><author><name sortKey="Blanz, T" sort="Blanz, T" uniqKey="Blanz T" first="T." last="Blanz">T. Blanz</name><affiliation wicri:level="1"><mods:affiliation>Institut für Meereskunde ‐ Meereschemie, Duesternbrooker Weg 20,, D‐24105, Kiel, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Meereskunde ‐ Meereschemie, Duesternbrooker Weg 20,, D‐24105, Kiel</wicri:regionArea></affiliation></author><author><name sortKey="Sawada, K" sort="Sawada, K" uniqKey="Sawada K" first="K." last="Sawada">K. Sawada</name><affiliation wicri:level="1"><mods:affiliation>Department of Chemistry, University of Tsukuba, 305‐8571, Tsukuba, Ibaraki, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Chemistry, University of Tsukuba, 305‐8571, Tsukuba, Ibaraki</wicri:regionArea></affiliation></author><author><name sortKey="Schulz Ull, D" sort="Schulz Ull, D" uniqKey="Schulz Ull D" first="D." last="Schulz-Bull">D. Schulz-Bull</name><affiliation wicri:level="1"><mods:affiliation>Institut für Meereskunde ‐ Meereschemie, Duesternbrooker Weg 20,, D‐24105, Kiel, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Meereskunde ‐ Meereschemie, Duesternbrooker Weg 20,, D‐24105, Kiel</wicri:regionArea></affiliation></author><author><name sortKey="Sikes, E" sort="Sikes, E" uniqKey="Sikes E" first="E." last="Sikes">E. Sikes</name><affiliation wicri:level="1"><mods:affiliation>School of Environmental and Marine Sciences, University of Auckland, Private Bag 92019,, Auckland, New Zealand</mods:affiliation><country xml:lang="fr">Nouvelle-Zélande</country><wicri:regionArea>School of Environmental and Marine Sciences, University of Auckland, Private Bag 92019,, Auckland</wicri:regionArea></affiliation></author><author><name sortKey="Sonzogni, C" sort="Sonzogni, C" uniqKey="Sonzogni C" first="C." last="Sonzogni">C. Sonzogni</name><affiliation wicri:level="1"><mods:affiliation>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, Université d'Aix‐Marseille III, Europole de l'Arbois, BP80,, F‐13545, Aix‐en‐Provence cedex 4</wicri:regionArea></affiliation></author><author><name sortKey="Ternois, Y" sort="Ternois, Y" uniqKey="Ternois Y" first="Y." last="Ternois">Y. Ternois</name><affiliation wicri:level="1"><mods:affiliation>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo, Japan</mods:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Institute Low Temperature Science, Hokkaido University, N19 W8, Kita‐ku,, Hokkaido, 060, Sapporo</wicri:regionArea></affiliation></author><author><name sortKey="Versteegh, G" sort="Versteegh, G" uniqKey="Versteegh G" first="G." last="Versteegh">G. Versteegh</name><affiliation wicri:level="1"><mods:affiliation>Department of Organic Geochemistry and Toxicology, Netherlands Institute for Sea Research, P.O. Box 59,, Texel, 1790 AB, Den Burg, Netherlands</mods:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Department of Organic Geochemistry and Toxicology, Netherlands Institute for Sea Research, P.O. Box 59,, Texel, 1790 AB, Den Burg</wicri:regionArea></affiliation></author><author><name sortKey="Volkman, J K" sort="Volkman, J K" uniqKey="Volkman J" first="J. K." last="Volkman">J. K. Volkman</name><affiliation wicri:level="1"><mods:affiliation>CSIRO Marine Research, GPO Box 1538,, Tasmania, 7001, Hobart, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>CSIRO Marine Research, GPO Box 1538,, Tasmania, 7001, Hobart</wicri:regionArea></affiliation></author><author><name sortKey="Wakeham, S" sort="Wakeham, S" uniqKey="Wakeham S" first="S." last="Wakeham">S. Wakeham</name><affiliation wicri:level="1"><mods:affiliation>Skidaway Institute of Oceanography, 10 Ocean Science Circle,, Georgia, 31411, Savannah, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Skidaway Institute of Oceanography, 10 Ocean Science Circle,, Georgia, 31411, Savannah</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Geochemistry, Geophysics, Geosystems</title><title level="j" type="alt">GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS</title><idno type="ISSN">1525-2027</idno><idno type="eISSN">1525-2027</idno><imprint><biblScope unit="vol">2</biblScope><biblScope unit="issue">7</biblScope><biblScope unit="page-count">28</biblScope><date type="published" when="2001-07">2001-07</date></imprint><idno type="ISSN">1525-2027</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1525-2027</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>5eme etage</term><term>Absolute abundance</term><term>Absolute difference</term><term>Alkenone</term><term>Alkenone concentrations</term><term>Alkenone proxy</term><term>Alkenone research</term><term>Alkenone standards</term><term>Alkenones</term><term>Alkenones interlaboratory comparison</term><term>Alpine research</term><term>Ammonia chemical ionization mass chromatograms</term><term>Anal</term><term>Analytical methodology</term><term>Analytical methods</term><term>Anonymous interlaboratory comparison study</term><term>Anova</term><term>Barcelona catalonia</term><term>Base peak</term><term>Base peak representation</term><term>Best values</term><term>Boulder colorado</term><term>Chem</term><term>Chimie marines</term><term>Chromatogram</term><term>Chromatographic analysis</term><term>Chromatographic system</term><term>Cleanup</term><term>Cleanup step</term><term>Climap project members</term><term>Collaborative trials</term><term>Confidence level</term><term>Current methods</term><term>Degrees celsius</term><term>Different laboratories</term><term>Dissimilar results</term><term>Geochemistry</term><term>Geochemistry geophysics geosystems</term><term>Geological sciences</term><term>Geophysics</term><term>Geosystems</term><term>Grimalt</term><term>Groups sediment</term><term>High value</term><term>Higher values</term><term>Hokkaido</term><term>Hokkaido university</term><term>Horrat values</term><term>Horwitz</term><term>Horwitz equation</term><term>Important aspect</term><term>Interlaboratory</term><term>Interlaboratory comparison</term><term>Interlaboratory comparison study</term><term>Interlaboratory evaluation</term><term>Interlaboratory reproducibility</term><term>Interlaboratory tests</term><term>Interlaboratory variability</term><term>Interlaboratory variance</term><term>International standardisation organisation</term><term>International union</term><term>Intralaboratory variance</term><term>John wiley</term><term>Jordi girona</term><term>Laboratory code figure</term><term>Lowest values</term><term>Main cluster</term><term>Main ions intensity</term><term>Marie curie</term><term>Marine research</term><term>Marine sediments</term><term>Mass spectrometry</term><term>Median</term><term>Meereskunde meereschemie</term><term>Minutes figure</term><term>Netherlands institute</term><term>Normal distribution</term><term>Organic geochemistry</term><term>Outlier</term><term>Paper number</term><term>Paris cedex</term><term>Particular laboratory</term><term>Pelagic conditions</term><term>Pennsylvania state university</term><term>Place jussieu</term><term>Present study</term><term>Pseudomolecular ions</term><term>Pure appl</term><term>Real value</term><term>Reconstructed chromatogram</term><term>Relative abundance</term><term>Repeatability</term><term>Repeatability limit</term><term>Reproducibility</term><term>Reproducibility conditions</term><term>Reproducibility limit</term><term>Rhode island</term><term>Rsdr</term><term>Same sign</term><term>Sample cleanup</term><term>Sediment</term><term>Sediment samples</term><term>Sediment test samples</term><term>Significant differences</term><term>Similar values</term><term>Single results</term><term>Solid curve</term><term>Squares degrees freedom</term><term>Standard deviation</term><term>Standard mixtures</term><term>Statistical evaluation</term><term>Statistical methods</term><term>Statistical parameters</term><term>Surface temperature</term><term>Surface temperatures</term><term>Systematic biases</term><term>Temperature difference</term><term>Temperature estimates</term><term>Temperature science</term><term>Test samples</term><term>Tukey post</term><term>Ultrasound</term><term>Universite pierre</term><term>University park</term><term>Values number</term><term>Values sample</term><term>Variance</term><term>Vertical axis</term><term>Villanueva</term><term>Wide variety</term><term>Youden plots</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>5eme etage</term><term>Absolute abundance</term><term>Absolute difference</term><term>Alkenone</term><term>Alkenone concentrations</term><term>Alkenone proxy</term><term>Alkenone research</term><term>Alkenone standards</term><term>Alkenones</term><term>Alkenones interlaboratory comparison</term><term>Alpine research</term><term>Ammonia chemical ionization mass chromatograms</term><term>Anal</term><term>Analytical methodology</term><term>Analytical methods</term><term>Anonymous interlaboratory comparison study</term><term>Anova</term><term>Barcelona catalonia</term><term>Base peak</term><term>Base peak representation</term><term>Best values</term><term>Boulder colorado</term><term>Chem</term><term>Chimie marines</term><term>Chromatogram</term><term>Chromatographic analysis</term><term>Chromatographic system</term><term>Cleanup</term><term>Cleanup step</term><term>Climap project members</term><term>Collaborative trials</term><term>Confidence level</term><term>Current methods</term><term>Degrees celsius</term><term>Different laboratories</term><term>Dissimilar results</term><term>Geochemistry</term><term>Geochemistry geophysics geosystems</term><term>Geological sciences</term><term>Geophysics</term><term>Geosystems</term><term>Grimalt</term><term>Groups sediment</term><term>High value</term><term>Higher values</term><term>Hokkaido</term><term>Hokkaido university</term><term>Horrat values</term><term>Horwitz</term><term>Horwitz equation</term><term>Important aspect</term><term>Interlaboratory</term><term>Interlaboratory comparison</term><term>Interlaboratory comparison study</term><term>Interlaboratory evaluation</term><term>Interlaboratory reproducibility</term><term>Interlaboratory tests</term><term>Interlaboratory variability</term><term>Interlaboratory variance</term><term>International standardisation organisation</term><term>International union</term><term>Intralaboratory variance</term><term>John wiley</term><term>Jordi girona</term><term>Laboratory code figure</term><term>Lowest values</term><term>Main cluster</term><term>Main ions intensity</term><term>Marie curie</term><term>Marine research</term><term>Marine sediments</term><term>Mass spectrometry</term><term>Median</term><term>Meereskunde meereschemie</term><term>Minutes figure</term><term>Netherlands institute</term><term>Normal distribution</term><term>Organic geochemistry</term><term>Outlier</term><term>Paper number</term><term>Paris cedex</term><term>Particular laboratory</term><term>Pelagic conditions</term><term>Pennsylvania state university</term><term>Place jussieu</term><term>Present study</term><term>Pseudomolecular ions</term><term>Pure appl</term><term>Real value</term><term>Reconstructed chromatogram</term><term>Relative abundance</term><term>Repeatability</term><term>Repeatability limit</term><term>Reproducibility</term><term>Reproducibility conditions</term><term>Reproducibility limit</term><term>Rhode island</term><term>Rsdr</term><term>Same sign</term><term>Sample cleanup</term><term>Sediment</term><term>Sediment samples</term><term>Sediment test samples</term><term>Significant differences</term><term>Similar values</term><term>Single results</term><term>Solid curve</term><term>Squares degrees freedom</term><term>Standard deviation</term><term>Standard mixtures</term><term>Statistical evaluation</term><term>Statistical methods</term><term>Statistical parameters</term><term>Surface temperature</term><term>Surface temperatures</term><term>Systematic biases</term><term>Temperature difference</term><term>Temperature estimates</term><term>Temperature science</term><term>Test samples</term><term>Tukey post</term><term>Ultrasound</term><term>Universite pierre</term><term>University park</term><term>Values number</term><term>Values sample</term><term>Variance</term><term>Vertical axis</term><term>Villanueva</term><term>Wide variety</term><term>Youden plots</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Géochimie</term><term>Géophysique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">Measurements of the U37K′ 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 U37K′ in sediments is estimated, with a probability of 95%, to be <2.1°C. In addition, the overall within‐laboratory precision for the U37K′ temperature estimates is estimated to be <1.6°C (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 U37K′ and especially alkenone quantification data across the community of scientists involved in alkenone research.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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