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Figure S1. Relationships between box flux (static chamber) and active chamber estimates of CO2, CH4, and N2O fluxes. The line is a regression line between the calibration box and the measured chamber flux.

Figure S2. Annual and diurnal variability of greenhouse gas flux at Alexandra Fiord. A) Annual variation in greenhouse gas flux from the fertilizer experiment. Only non-fertilized plots n=5 (both control and warmed) were measured in both 2009 and 2010. Bars represent the average of 10 measurements (control and warmed are reported together) with error bars representing the standard error of the estimate. B) Diurnal variation of CO2 and N2O in a Salix arctica (Arctic Willow) dominated ecosystem. Symbols indicate the average of four replicate plots measured simultaneously with error bars representing the standard error of the mean. Gas flux was measured daily roughly every 20 min for a two day period for a total of 125 measurements.

Table S1. Primer information.

Table S2. Plant community characteristics, GHG fluxes, and soil chemical and microbial properties measured in each experimental treatment. Warm indicates an OTC, Water added water, and F0, 10, and 50 indicate the amount of fertilizer added (g m-2). Values are means ±1 standard deviation. n=5 for all values except the Control treatment for CO2, CH4, and N2O where n=45.

Table S3. Matrix of correlations between CO2 N2O, and CH4 fluxes (μmol m-2 s-1), live vegetation height (mm) and cover (number of hits), soil characteristics including soil organic carbon (SOC), NH4, NO3, PO4, and dissolved organic nitrogen (DON) concentrations (mg kg-1), activation energies (Ea) of CO2 N2O, and CH4 production, and prevalence (copy# g-1) of CrenamoA, amoA, and nosZ. *P<0.05, **P<0.01, ***P<0.001.

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