Radiocarbon ages of methane in arctic and boreal lakes (2003-2017)

Radiocarbon ages of methane collected at the surface of lakes are presented. These data were used in Brosius et al. (2023) to calculate composite ages of lake emissions weighted to account for variation in emission mode, permafrost substrate and lake type. Lake names are informal except those marked *. Permafrost types include yedoma (Y) and non-yedoma (NY). Bubble classes refer to yedoma lake hotspot seeps (1), yedoma lake non-hotspot seeps (2), yedoma lake non-seep background ebullition and bubbles released by stirring sediments (3), non-yedoma lake seep ebullition (4), non-yedoma lake background ebullition (5). All 14C-dated bubble samples represent naturally occurring ebullition events, except class 3 bubbles generated by people stirring surface lake sediments (indicated by †). Emission modes refer to ebullition (E) and diffusion (D). References are numbered following Brosius et al.

呈现了在湖泊表面采集的甲烷的放射性碳年龄（radiocarbon ages）。这些数据被Brosius等人（2023）用于计算湖泊排放的复合年龄，计算时通过加权以考虑排放模式、永久冻土基底和湖泊类型的差异。湖泊名称均为非正式名称，标有*者除外。永久冻土类型包括雅多马冻土（yedoma，Y）和非雅多马冻土（non-yedoma，NY）。气泡类别包括：雅多马冻土湖泊热点渗漏（1）、雅多马冻土湖泊非热点渗漏（2）、雅多马冻土湖泊非渗漏背景冒泡（ebullition）及搅拌沉积物释放的气泡（3）、非雅多马冻土湖泊渗漏冒泡（4）、非雅多马冻土湖泊背景冒泡（5）。所有经14C定年的气泡样本均代表自然发生的冒泡事件，但3类气泡除外，该类气泡由人为搅拌湖泊表层沉积物产生（以†标注）。排放模式包括冒泡（E）和扩散（diffusion，D）。参考文献编号遵循Brosius等人（2023）的编号规则。