An intercomparison of oceanic methane and nitrous oxide measurements

作者：Samuel T. Wilson, Hermann W. Bange, Damian Leonardo Arévalo-Martínez, Jonathan David Barnes, Alberto Vieira Borges, Ian Brown, John L. Bullister, Macarena Burgos, David W. Capelle, Michael A. Casso, Mercedes de la Paz, Laura Farı́as, Lindsay Fenwick, Sara Goberna Ferron, Gerardo Azócar García, Michael Glockzin, David M. Karl, Annette Kock, Sarah M. Laperriere, Cliff S. Law, Cara C. M. Manning, Andrew Marriner, Jukka‐Pekka Myllykangas, J. Pohlman, Andrew P. Rees, Alyson E. Santoro, Philippe D. Tortell, Robert C. Upstill‐Goddard, David P. Wisegarver, Guiling Zhang, Gregor Rehder · 发表于：Biogeosciences · 年份：2018 · DOI：10.5194/bg-15-5891-2018 · 被引用次数：85 · 研究领域：Atmospheric and Environmental Gas Dynamics、Methane Hydrates and Related Phenomena、Marine and coastal ecosystems

Large-scale climatic forcing is impacting oceanic biogeochemical cycles and is expected to influence the water-column distribution of trace gases, including methane and nitrous oxide. Our ability as a scientific community to evaluate changes in the water-column inventories of methane and nitrous oxide depends largely on our capacity to obtain robust and accurate concentration measurements that can be validated across different laboratory groups. This study represents the first formal international intercomparison of oceanic methane and nitrous oxide measurements whereby participating laboratories received batches of seawater samples from the subtropical Pacific Ocean and the Baltic Sea. Additionally, compressed gas standards from the same calibration scale were distributed to the majority of participating laboratories to improve the analytical accuracy of the gas measurements. The computations used by each laboratory to derive the dissolved gas concentrations were also evaluated for inconsistencies (e.g., pressure and temperature corrections, solubility constants). The results from the intercomparison and intercalibration provided invaluable insights into methane and nitrous oxide measurements. It was observed that analyses of seawater samples with the lowest concentrations of methane and nitrous oxide had the lowest precisions. In comparison, while the analytical precision for samples with the highest concentrations of trace gases was better, the variability between the diff...