Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments
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...
| Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2001 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:181779 |
| Acceso en línea: | https://ddd.uab.cat/record/181779 https://dx.doi.org/urn:doi:10.1029/2000GC000141 |
| Access Level: | acceso abierto |
| Palabra clave: | Alkenones UK 37 Interlaboratory comparison |
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Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sedimentsresults of an interlaboratory comparison studyRosell Melé, Antoni|||0000-0002-5513-2647Bard, Edouard|||0000-0002-7237-8622Emeis, K.-C.Grimalt, Joan|||0000-0002-7391-5768Müller, P.Schneider, R.Bouloubassi, I.Epstein, B.Fahl, K.Fluegge, A.Freeman, K.Goñi, Miguel|||0000-0001-7682-8064Güntner, U.Hartz, D.Hellebust, S.Herbert, T.Ikehara, M.Ishiwatari, R.Kawamura, K.Kenig, F.de Leeuw, J.Lehman, S.Mejanelle, L.Ohkouchi, Naohiko|||0000-0002-6355-7469Pancost, R. D.Pelejero, Carles|||0000-0002-7763-7769Prahl, F.Quinn, J.Rontani, J. -F.Rostek, F.Rullkötter, J.Sachs, J.Blanz, T.Sawada, K.Schulz-Bull, D.Sikes, E.Sonzogni, C.Ternois, Y.Versteegh, G.Volkman, J. K.Wakeham, S.AlkenonesUK 37Interlaboratory comparisonMeasurements 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. 22001-01-0120012001-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/181779https://dx.doi.org/urn:doi:10.1029/2000GC000141reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.https://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:1817792026-06-06T12:50:31Z |
| dc.title.none.fl_str_mv |
Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments results of an interlaboratory comparison study |
| title |
Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments |
| spellingShingle |
Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments Rosell Melé, Antoni|||0000-0002-5513-2647 Alkenones UK 37 Interlaboratory comparison |
| title_short |
Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments |
| title_full |
Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments |
| title_fullStr |
Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments |
| title_full_unstemmed |
Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments |
| title_sort |
Precision of the current methods to measure the alkenone proxy UK'37 and absolute alkenone abundance in sediments |
| dc.creator.none.fl_str_mv |
Rosell Melé, Antoni|||0000-0002-5513-2647 Bard, Edouard|||0000-0002-7237-8622 Emeis, K.-C. Grimalt, Joan|||0000-0002-7391-5768 Müller, P. Schneider, R. Bouloubassi, I. Epstein, B. Fahl, K. Fluegge, A. Freeman, K. Goñi, Miguel|||0000-0001-7682-8064 Güntner, U. Hartz, D. Hellebust, S. Herbert, T. Ikehara, M. Ishiwatari, R. Kawamura, K. Kenig, F. de Leeuw, J. Lehman, S. Mejanelle, L. Ohkouchi, Naohiko|||0000-0002-6355-7469 Pancost, R. D. Pelejero, Carles|||0000-0002-7763-7769 Prahl, F. Quinn, J. Rontani, J. -F. Rostek, F. Rullkötter, J. Sachs, J. Blanz, T. Sawada, K. Schulz-Bull, D. Sikes, E. Sonzogni, C. Ternois, Y. Versteegh, G. Volkman, J. K. Wakeham, S. |
| author |
Rosell Melé, Antoni|||0000-0002-5513-2647 |
| author_facet |
Rosell Melé, Antoni|||0000-0002-5513-2647 Bard, Edouard|||0000-0002-7237-8622 Emeis, K.-C. Grimalt, Joan|||0000-0002-7391-5768 Müller, P. Schneider, R. Bouloubassi, I. Epstein, B. Fahl, K. Fluegge, A. Freeman, K. Goñi, Miguel|||0000-0001-7682-8064 Güntner, U. Hartz, D. Hellebust, S. Herbert, T. Ikehara, M. Ishiwatari, R. Kawamura, K. Kenig, F. de Leeuw, J. Lehman, S. Mejanelle, L. Ohkouchi, Naohiko|||0000-0002-6355-7469 Pancost, R. D. Pelejero, Carles|||0000-0002-7763-7769 Prahl, F. Quinn, J. Rontani, J. -F. Rostek, F. Rullkötter, J. Sachs, J. Blanz, T. Sawada, K. Schulz-Bull, D. Sikes, E. Sonzogni, C. Ternois, Y. Versteegh, G. Volkman, J. K. Wakeham, S. |
| author_role |
author |
| author2 |
Bard, Edouard|||0000-0002-7237-8622 Emeis, K.-C. Grimalt, Joan|||0000-0002-7391-5768 Müller, P. Schneider, R. Bouloubassi, I. Epstein, B. Fahl, K. Fluegge, A. Freeman, K. Goñi, Miguel|||0000-0001-7682-8064 Güntner, U. Hartz, D. Hellebust, S. Herbert, T. Ikehara, M. Ishiwatari, R. Kawamura, K. Kenig, F. de Leeuw, J. Lehman, S. Mejanelle, L. Ohkouchi, Naohiko|||0000-0002-6355-7469 Pancost, R. D. Pelejero, Carles|||0000-0002-7763-7769 Prahl, F. Quinn, J. Rontani, J. -F. Rostek, F. Rullkötter, J. Sachs, J. Blanz, T. Sawada, K. Schulz-Bull, D. Sikes, E. Sonzogni, C. Ternois, Y. Versteegh, G. Volkman, J. K. Wakeham, S. |
| author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Alkenones UK 37 Interlaboratory comparison |
| topic |
Alkenones UK 37 Interlaboratory comparison |
| description |
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. |
| publishDate |
2001 |
| dc.date.none.fl_str_mv |
2 2001-01-01 2001 2001-01-01 |
| dc.type.none.fl_str_mv |
Article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
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info:eu-repo/semantics/article |
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article |
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https://ddd.uab.cat/record/181779 https://dx.doi.org/urn:doi:10.1029/2000GC000141 |
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https://ddd.uab.cat/record/181779 https://dx.doi.org/urn:doi:10.1029/2000GC000141 |
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Inglés eng |
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Inglés |
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eng |
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open access http://purl.org/coar/access_right/c_abf2 https://rightsstatements.org/vocab/InC/1.0/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 https://rightsstatements.org/vocab/InC/1.0/ |
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openAccess |
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application/pdf |
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