Methane concentrations in headspace gas prepared from shallow sediment core GeoB22062-1 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，在METEOR号科考船（R/V METEOR）的M134/1航次期间，使用多管取样器（MultiCorer）在南乔治亚岛陆架与斜坡区域采集了浅海沉积物岩心。为确定沉积物中甲烷的分布特征及生物地球化学分带（biogeochemical zonations），使用截断式注射器（cut-off syringes）从岩心的特定深度处取出3 mL沉积物，转移至装有5 mL氢氧化钠溶液（NaOH solution）的20 mL玻璃样品瓶中，以形成12 mL的顶空气体体积。采用配备毛细管柱（capillary column）和火焰离子化检测器（flame ionization detector）的气相色谱仪（gas chromatograph）分析顶空气体样品中的甲烷浓度。