Permafrost_carbon_Supplementary_Data.xlsx

The datasets presented are primarily data syntheses from the literature of carbon stocks and fluxes from the northern permafrost region from the Last Glacial Maximum (LGM; 21,000 years before present) to present. Deglacial carbon stocks were estimated from the northern permafrost zone by subtracting estimates of carbon losses from LGM values of different systems (e.g., shelf/subsea, thermokarst lakes, peatland, yedoma, subglacial) reported in the literature. Values reported for present day were compiled from the literature. Carbon losses from permafrost thaw are reported as petagrams CO₂-C (fraction of carbon from CO₂) per degree Celsius (Pg CO₂-C ºC^-1), petagrams CH₄-C (fraction of carbon from CH4) per degree Celsius, and total petagrams carbon per degree Celsius (Pg CH4-C ºC^-1) where possible. Where values were not reported as Pg C ºC^-1 in the literature, fluxes were divided by the change in temperature for the time period using deglacial temperature changes from the literature.