Greenhouse Gas Flux Measurements from Permafrost-Affected Features Near Utqiaġvik, Alaska 2021-2023

This dataset contains greenhouse gas fluxes of nitrous oxide (N2O), carbon dioxide (CO2), and methane (CH4) over permafrost affected features near Utqiaġvik, Alaska in a coastal wetland ecosystem on the Barrow Environmental Observatory (BEO). Static chamber flux measurements were acquired using a GASMET GT5000 Terra portable ambient temperature Fourier transform infrared (FTIR) gas analyzer. A clear, cylindrical polycarbonate chamber (50 centimeter (cm) in height and 20 cm in diameter) and chamber collars made out of PVC pipe (15 cm in height and 20 cm in diameter) were used to create a closed loop system for measuring fluxes throughout July of 2021, and June through August during 2022 and 2023. Chamber collars were inserted at a depth of 10 cm three to five days before sampling. By the 2023 field season, we had installed a total of 51 replicates throughout the BEO – 46 replicates consisting of unvegetated soil features and 5 replicates consisting of vegetated features.
Environmental ancillary measurements were recorded during static chamber flux measurements at each collar location throughout the field campaigns. In 2021, soil surface temperatures were recorded using an infrared thermometer and in 2022 to 2023 soil temperatures were recorded within the top 4 cm of the active layer using a waterproof probe thermometer (UX-90205-22, Cole-Palmer Instrument Company, USA). Volumetric soil water content was measured within the top 20 cm of the active layer using a soil moisture probe (TDR 300 Fieldscout, Spectrum Technologies INC). Thaw depth was recorded using a graduated metal rod.