Carbon-13 (13C) methane from an isotopic labelling experiment in Arctic tundra, Utqiagvik, Alaska, 2019.

An isotopic labeling experiment was conducted in an Arctic coastal wet tundra ecosystem to determine how quickly acetate is transformed into methane and transported from the soil to the atmosphere. Carbon-13 (13C) labelled acetate was injected into soil chambers installed across a 131 meter (m) transect. Gas samples were periodically collected from the headspace in chambers, and analyzed for methane concentration and enrichment in 13C. Methane flux was roughly estimated from the final concentration in the chambers accumulated over a one-hour sampling period. This dataset includes methane fluxes, concentrations and 13C enrichment values from this experiment. In addition, water samples were collected from 15 centimeters (cm) depth after the final time point for measurements of residual dissolved 13C-methane in the soil after 9 days.

本研究在北极滨海湿苔原生态系统中开展同位素标记实验，旨在明确乙酸盐转化为甲烷并从土壤向大气运移的速率。研究人员将碳-13（Carbon-13，¹³C）标记的乙酸盐注入沿131米样带布设的土壤气室中。定期采集气室顶空气体样品，分析其中的甲烷浓度与¹³C富集程度。基于1小时采样周期内气室中累积的最终气体浓度，粗略估算甲烷通量。本数据集包含本次实验得到的甲烷通量、气体浓度及¹³C富集值。此外，在实验最终采样时点结束后，于15厘米（centimeters，cm）深度采集水样，用以测定标记实验开展9天后土壤中残留的溶解态¹³C标记甲烷。