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<p>The Arctic–Boreal Zone is rapidly warming, impacting its large soil carbon stocks. Here we use a new compilation of terrestrial ecosystem CO<sub>2</sub> fluxes, geospatial datasets and random forest models to show that although the Arctic–Boreal Zone was overall an increasing terrestrial CO<sub>2</sub> sink from 2001 to 2020 (mean ± standard deviation in net ecosystem exchange, −548 ± 140 Tg C yr<sup>−1</sup>; trend, −14 Tg C yr<sup>−1</sup>; <i>P</i> &lt; 0.001), more than 30% of the region was a net CO<sub>2</sub> source. Tundra regions may have already started to function on average as CO<sub>2</sub> sources, demonstrating a shift in carbon dynamics. When fire emissions are factored in, the increasing Arctic–Boreal Zone sink is no longer statistically significant (budget, −319 ± 140 Tg C yr<sup>−1</sup>; trend, −9 Tg C yr<sup>−1</sup>), and the permafrost region becomes CO<sub>2</sub> neutral (budget, −24 ± 123 Tg C yr<sup>−1</sup>; trend, −3 Tg C yr<sup>−1</sup>), underscoring the importance of fire in this region.</p>

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Wildfires offset the increasing but spatially heterogeneous Arctic–boreal CO2 uptake

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月21日

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  • Anna-Maria Virkkala,
  • Brendan M. Rogers,
  • Jennifer D. Watts,
  • Kyle A. Arndt,
  • Stefano Potter,
  • Isabel Wargowsky,
  • Edward A. G. Schuur,
  • Craig R. See,
  • Marguerite Mauritz,
  • Julia Boike,
  • M. Syndonia Bret-Harte,
  • Eleanor J. Burke,
  • Arden Burrell,
  • Namyi Chae,
  • Abhishek Chatterjee,
  • Frederic Chevallier,
  • Torben R. Christensen,
  • Roisin Commane,
  • Han Dolman,
  • Colin W. Edgar,
  • Bo Elberling,
  • Craig A. Emmerton,
  • Eugenie S. Euskirchen,
  • Liang Feng,
  • Mathias Göckede,
  • Achim Grelle,
  • Manuel Helbig,
  • David Holl,
  • Järvi Järveoja,
  • Sergey V. Karsanaev,
  • Hideki Kobayashi,
  • Lars Kutzbach,
  • Junjie Liu,
  • Ingrid T. Luijkx,
  • Efrén López-Blanco,
  • Kyle Lunneberg,
  • Ivan Mammarella,
  • Maija E. Marushchak,
  • Mikhail Mastepanov,
  • Yojiro Matsuura,
  • Trofim C. Maximov,
  • Lutz Merbold,
  • Gesa Meyer,
  • Mats B. Nilsson,
  • Yosuke Niwa,
  • Walter Oechel,
  • Paul I. Palmer,
  • Sang-Jong Park,
  • Frans-Jan W. Parmentier,
  • Matthias Peichl,
  • Wouter Peters,
  • Roman Petrov,
  • William Quinton,
  • Christian Rödenbeck,
  • Torsten Sachs,
  • Christopher Schulze,
  • Oliver Sonnentag,
  • Vincent L. St. Louis,
  • Eeva-Stiina Tuittila,
  • Masahito Ueyama,
  • Andrej Varlagin,
  • Donatella Zona,
  • Susan M. Natali

摘要

The Arctic–Boreal Zone is rapidly warming, impacting its large soil carbon stocks. Here we use a new compilation of terrestrial ecosystem CO2 fluxes, geospatial datasets and random forest models to show that although the Arctic–Boreal Zone was overall an increasing terrestrial CO2 sink 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 CO2 source. Tundra regions may have already started to function on average as CO2 sources, demonstrating a shift in carbon dynamics. When fire emissions are factored in, the increasing Arctic–Boreal Zone sink is no longer statistically significant (budget, −319 ± 140 Tg C yr−1; trend, −9 Tg C yr−1), and the permafrost region becomes CO2 neutral (budget, −24 ± 123 Tg C yr−1; trend, −3 Tg C yr−1), underscoring the importance of fire in this region.