Methane concentrations in headspace gas prepared from shallow sediment core GeoB22047-3 collected with a push corer off South Georgia, Southern Ocean, R/V METEOR cruise M134/1

Shallow sediment cores were collected with Push Cores deployed with the ROV MARUM-SQUID at locations on the shelf and slope of South Georgia during cruise M134/1 with R/V METEOR in 2017. In order to determine distributions of methane and characterize biogeochemical zonations in the sediment, 3 mL of the sediment was removed from the cores at defined depths using cut-off syringes and transferred to 20 mL glass vials filled with 5 ml NaOH solution to generate a 12 mL headspace gas volume. The headspace gas samples were analyzed for their methane concentrations by use of a gas chromatograph equipped with a capillary column and a flame ionization detector.

2017年，在METEOR号科考船（R/V METEOR）执行M134/1航次期间，研究人员利用MARUM-SQUID遥控潜水器（ROV MARUM-SQUID）搭载的推送式岩芯（Push Cores），在南乔治亚岛陆架与陆坡区域采集了浅层沉积物岩芯。为测定沉积物中的甲烷分布并表征其生物地球化学分带特征，研究人员使用截断式注射器从岩芯的特定深度处取出3 mL沉积物，转移至装有5 mL氢氧化钠溶液（NaOH solution）的20 mL玻璃小瓶中，以形成12 mL的顶空气体体积。采用配备毛细管柱和火焰离子化检测器的气相色谱仪，对顶空气体样品中的甲烷浓度进行分析。