Radiocarbon and bulk isotope composition of subglacial methane and carbon dioxide emitted at the western margin of the Greenland ice sheet

2. Discription of the data Data collection related to the manuscript/paper "Radiocarbon and bulk isotope composition of subglacial methane and carbon dioxide emitted at the westernmargin of the Greenland ice sheet". Sheet 1: Concentrations of CH₄ and CO₂, δ¹³C(CH₄), δD(CH₄), δ¹³C(CO₂), and the Bernard ratio for air and dissolved samples collected on June 2022. Sheet 2: Concentrations of CH₄ and CO₂, δ¹³C(CH₄), δD(CH₄), and the Bernard ratio for air and dissolved samples collected on May to June 2023. Sheet 3: Concentrations of CH₄ and CO₂, δ¹³C(CH₄), δD(CH₄), and the Bernard ratio for air and dissolved samples collected on Auguts 2023. Sheet 4: Concentrations of CH₄ and CO₂, δ¹³C(CH₄) and δD(CH₄) for air and dissolved samples collected on September 2023. Sheet 5: Radiocarbon data for CH₄ and CO₂ for air and dissolved samples collected on June 2022. Sheet 6: Electrical conductivity; concentrations of dissolved organic and inorganic carbon; major cations (sodium, magnesium, potassium, and calcium); and the δ¹³C value of dissolved inorganic carbon (DIC) for subglacial and supraglacial water samples collected in June 2022. 3. Site description The primary study site is located at an elevation of 450 m above sea level at a lateral subglacial meltwater outlet on the southern flank at the terminus of the Isunnguata Sermia Glacier at the western margin of the GrIS (67°09’16.40’’N 50°04’08.48’’W). In addition samples were collected from a subglacial outlet of the Russel glacier (RG), located at 67◦05′22′′N altitude and 50◦14′18′′W longitude and from nearby lakes (drinking water lake (DWL) (67°07’45.7”N 50°09’52.8”W), radar lake (RL) (66°59’11.5”N 50°55’19.1”W)) and pond (pond (P) (67°09’04.5”N and 50°04’08.3”W)).