Polygonal tundra geomorphological change in response to warming alters future CO₂ and CH₄ flux on the Barrow Peninsula

The landscape of the Barrow Peninsula in northern Alaska is thought to have formed over centuries to millennia, and is now dominated by ice-wedge polygonal tundra that spans drained thaw-lake basins and interstitial tundra. In nearby tundra regions, studies have identified a rapid increase in thermokarst formation (i.e., pits) over recent decades in response to climate warming, facilitating changes in polygonal tundra geomorphology. We assessed the future impact of 100 years of tundra geomorphic change on peak growing season carbon exchange in response to: (i) landscape succession associated with the thaw-lake cycle; and (ii) low, moderate, and extreme scenarios of thermokarst pit formation (10%, 30%, and 50%) reported for Alaskan arctic tundra sites. We developed a 30 × 30 m resolution tundra geomorphology map (overall accuracy:75%; Kappa:0.69) for our ~1800 km² study area composed of ten classes; drained slope, high center polygon, flat-center polygon, low center polygon, coalescent low center polygon, polygon trough, meadow, ponds, rivers, and lakes, to determine their spatial distribution across the Barrow Peninsula. Land-atmosphere CO₂ and CH₄ flux data were collected for the summers of 2006-2010 at eighty-two sites near Barrow, across the mapped classes. The developed geomorphic map was used for the regional assessment of carbon flux. Results indicate (i) at present during peak growing season on the Barrow Peninsula, CO₂ uptake occurs at -902.3 10⁶gC-CO₂ day^-1 (uncertainty using 95% CI is between -438.3 and -1366 10⁶gC-CO₂ day^-1) and CH₄ flux at 28.9 10⁶gC-CH₄ day^-1(uncertainty using 95% CI is between 12.9 and 44.9 10⁶gC-CH₄ day^-1), (ii) one century of future landscape change associated with the thaw-lake cycle only slightly alter CO₂ and CH₄ exchange, while (iii) moderate increases in thermokarst pits would strengthen both CO₂ uptake (-166.9 10⁶gC-CO₂ day^-1) and CH₄ flux (2.8 10⁶gC-CH₄ day^-1) with geomorphic change from low to high center polygons, cumulatively resulting in an estimated negative feedback to warming during peak growing season.