Permafrost Carbon: Progress on Understanding Stocks and Fluxes Across Northern Terrestrial Ecosystems ...

• Main Authors: Treat, Claire C., Virkkala, Anna-Maria, Burke, Eleanor, Bruhwiler, Lori, Chatterjee, Abhishek, Fisher, Joshua B., Hashemi, Josh, Parmentier, Frans-Jan W., Rogers, Brendan M., Westermann, Sebastian, Watts, Jennifer D., Blanc-Betes, Elena, Fuchs, Matthias, Kruse, Stefan, Malhotra, Avni, Miner, Kimberley, Strauss, Jens, Armstrong, Amanda, Epstein, Howard E., Gay, Bradley, Goeckede, Mathias, Kalhori, Aram, Kou, Dan, Miller, Charles E., Natali, Susan M., Oh, Youmi, Shakil, Sarah, Sonnentag, Oliver, Varner, Ruth K., Zolkos, Scott, Schuur, Edward A. G., Hugelius, Gustaf
• Format: Text
• Language: English
• Published: AGU 2024
• Subjects: boreal; carbon; CO₂ flux; methane flux; permafrost; review; synthesis; tundra; Arctic; Tundra; Alaska
• Online Access: https://dx.doi.org/10.13016/m2azan-5ngj; https://mdsoar.org/handle/11603/31980

Significant progress in permafrost carbon science made over the past decades include the identification of vast permafrost carbon stocks, the development of new pan-Arctic permafrost maps, an increase in terrestrial measurement sites for CO₂ and methane fluxes, and important factors affecting carbon cycling, including vegetation changes, periods of soil freezing and thawing, wildfire, and other disturbance events. Process-based modeling studies now include key elements of permafrost carbon cycling and advances in statistical modeling and inverse modeling enhance understanding of permafrost region C budgets. By combining existing data syntheses and model outputs, the permafrost region is likely a wetland methane source and small terrestrial ecosystem CO₂ sink with lower net CO₂ uptake toward higher latitudes, excluding wildfire emissions. For 2002–2014, the strongest CO₂ sink was located in western Canada (median: −52 g C ⁻² y ⁻¹) and smallest sinks in Alaska, Canadian tundra, and Siberian tundra (medians: −5 ...