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2 ml sediment samples were taken with cut-off syringes from freshly retrieved sediment cores, placed into 5 ml of 1 mM NaOH in 30 ml serum vials, and capped with thick rubber stoppers. Methane concentrations were measured in the laboratory of J.P. Chanton (Florida State University) according to a modified headspace technique (Magen et al. 2014). Methane isotopic composition was measured by gas chromatography coupled with mass spectrometry (Chanton and Liptay 2014).<\/p>\n
References:<\/em> Chanton, J., and K. Liptay. 2000. Seasonal variation in methane oxidation in a landfill cover soils as determined by an in-situ stable topic technique. Global Biogeochemical Cycles 14:51-60. doi:10.1029\/1999GB900087<\/a><\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Porewater methane concentrations from sediment cores collected on the Guaymas Basin Ridge flanks and the Sonora Margin in 2014","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":" Porewater methane concentrations from sediment cores P3, P6, P10, P11, P12 and P13, collected on the Guaymas Basin Ridge flanks and the Sonora Margin. Sediment cores were collected from\u00a0R\/V El Puma, the Pacific Coast research vessel of the Autonomous University of Mexico, leaving Guaymas on October 14, 2014, and heading to Mazatlan on October 27, 2014.<\/p>\n Related datasets: BCO-DMO Processing:
\nMagen, C., L.L. Lapham, J.W. Pohlman, K. Marshall, S.Bosman, M. Casso, and J.P. Chanton. 2014. A simple headspace equilibration method for measuring dissolved methane. Limnol. Oceanogr. Methods 12 637-650. doi:10.4319\/lom.2014.12.637<\/a><\/p>\n
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