Methane concentrations in headspace gas prepared from shallow sediment core GeoB22015-1 collected with a multicorer off South Georgia, Southern Ocean, R/V METEOR cruise M134/1

Shallow sediment cores were collected with a MultiCorer 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，科研团队搭乘“流星号”科考船（R/V METEOR）执行M134/1航次，于南乔治亚岛陆架与陆坡站位使用多管沉积物采样器（MultiCorer）采集浅层沉积物岩芯。为探明沉积物中甲烷的分布特征并表征其生物地球化学分带，研究人员使用截短注射器于预设深度从岩芯中采集3毫升沉积物样品，转移至装有5毫升氢氧化钠（NaOH）溶液的20毫升玻璃顶空瓶中，以形成12毫升的顶空气体体积。随后采用配备毛细管色谱柱与火焰离子化检测器的气相色谱仪对顶空气体样品的甲烷浓度进行分析测定。