An increasing Arctic-boreal CO2sink offset by wildfires and source regions
Author:
Virkkala Anna-MariaORCID, Rogers Brendan M., Watts Jennifer D., Arndt Kyle A., Potter Stefano, Wargowsky Isabel, Schuur Edward A. G., See Craig, Mauritz Marguerite, Boike Julia, Bret-Harte Syndonia M., Burke Eleanor J., Burrell Arden, Chae Namyi, Chatterjee Abhishek, Chevallier Frederic, Christensen Torben R., Commane Roisin, Dolman Han, Elberling Bo, Emmerton Craig A., Euskirchen Eugenie S., Feng Liang, Goeckede Mathias, Grelle Achim, Helbig Manuel, Holl David, Järveoja Järvi, Kobayashi Hideki, Kutzbach Lars, Liu Junjie, Liujkx Ingrid, López-Blanco Efrén, Lunneberg Kyle, Mammarella Ivan, Marushchak Maija E., Mastepanov Mikhail, Matsuura Yojiro, Maximov Trofim, Merbold Lutz, Meyer Gesa, Nilsson Mats B., Niwa Yosuke, Oechel Walter, Park Sang-Jong, Parmentier Frans-Jan W., Peichl Matthias, Peters Wouter, Petrov Roman, Quinton William, Rödenbeck Christian, Sachs Torsten, Schulze Christopher, Sonnentag Oliver, St.Louis Vincent, Tuittila Eeva-Stiina, Ueyama Masahito, Varlagin Andrej, Zona Donatella, Natali Susan M.
Abstract
AbstractThe Arctic-Boreal Zone (ABZ) is rapidly warming, impacting its large soil carbon stocks. We use a new compilation of terrestrial ecosystem CO2fluxes, geospatial datasets and random forest models to show that although the ABZ was an increasing terrestrial CO2sink from 2001 to 2020 (mean ± standard deviation in net ecosystem exchange: −548 ± 140 Tg C yr-1; trend: −14 Tg C yr-1, p<0.001), more than 30% of the region was a net CO2source. Tundra regions may have already started to function on average as CO2sources, demonstrating a critical shift in carbon dynamics. After factoring in fire emissions, the increasing ABZ sink was no longer statistically significant (budget: −319 ± 140 Tg C yr-1; trend: −9 Tg C yr-1), with the permafrost region becoming CO2neutral (budget: −24 ± 123 Tg C yr-1; trend: −3 Tg C yr-1), underscoring the importance of fire in this region.
Publisher
Cold Spring Harbor Laboratory
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