Methane oxidation in Arctic seawater, Utqiagvik, Alaska, supplement to: Uhlig, Christiane; Loose, Brice (2017): Using stable isotopes and gas concentrations for independent constraints on microbial methane oxidation at Arctic Ocean temperatures. Limnology and Oceanography-Methods, 15(8), 737-751

• Main Authors: Uhlig, Christiane, Loose, Brice
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2017
• Subjects: Event label; Date/Time of event; Latitude of event; Longitude of event; DEPTH, water; Depth, top/min; Depth, bottom/max; Sample ID; Treatment; Sample amount; Duration, number of days; Duration, number of days, standard deviation; Methane; Methane, standard deviation; Methane, natural logarithm; Methane, natural logarithm, standard deviation; δ13C, methane; δ13C, methane, standard deviation; Y-axis high mean; Y-axis high, standard deviation; Y-axis low mean; Y-axis low, standard deviation; Multiple investigations; Cavity ring-down spectrometer G2201-i, coupled to a small sample isotope module; Calculated; Calculated, see references; Arctic; Arctic Ocean; Brice; Christiane; Beaufort Sea; north slope; Sea ice; Alaska
• Online Access: https://dx.doi.org/10.1594/pangaea.874893; https://doi.pangaea.de/10.1594/PANGAEA.874893

Arctic seawater was collected at two sites close to Utqiagvik, North Slope, Alaska on 7, 9 and 15 April 2016 in the Beaufort Sea. Site "Elson Lagoon" (EL) was located North of Utqiagvik (2016-04-07, 71.334° N, -156.363° W), covered with 1.5 m thick sea ice and shallow with approximately 1.5 m depth. Water was collected from a depth of 1.5 m in a narrow layer of water between the sea ice and the sediment. Site "Ice Mass Balance Buoy" (IMB) was located 1 km offshore of Utqiagvik (2016-04-07, 71.373° N, -156.548° W), and (2016-04-09, 71.372° N, -156.540° W). This site was characterized by 1 m thick fast ice cover and a water depth of approximately 7 m. Water was collected at five depths from 1 to 6.5 m.Seawater was additionally sampled in Narragansett Bay, Rhode Island, from the pier of the Graduate School of Oceanography, University of Rhode Island (41.492° N, -71.419° W) on 15 July 2016 to test our method for applicability under different environmental conditions. Sampling depth was 2-3 m at a water depth of approx. 6 m.Seawater was amended with different methane concentrations to determine methane oxidation rates in a headspace approach. Methane concentration and isotope ratios were determined with a Picarro G2201-i cavity ring-down spectrometer (Picarro, Santa Clara, California, USA) coupled to a Small Sample Isotope Module (SSIM) (Picarro, Santa Clara, California, USA). Several treatments were amended with sodium hydroxide (NaOH) to serve as killed controls or with 2-bromoethanesulphonate (BES) an inhibitor for methane production.