The key role of forest disturbance in reconciling estimates of the northern carbon sink

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/108158 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/108158 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/108158 archive 353 disk0/00/02/01/40 2024-11-22 09:09:12 2024-11-22 09:09:12 2024-11-22 09:09:12 article show O’Sullivan M. Sitch S. Friedlingstein P. Luijkx I.T. Peters W. Rosan T.M. Arneth A. Arora V.K. Chandra N. Chevallier F. Ciais P. Falk S. Feng L. Gasser T. 2136 0000-0003-4882-2647 Houghton R.A. Jain A.K. Kato E. Kennedy D. Knauer J. McGrath M.J. Niwa Y. Palmer P.I. Patra P.K. Pongratz J. Poulter B. Rödenbeck C. Schwingshackl C. Sun Q. Tian H. Walker A.P. Yang D. Yuan W. Yue X. Zaehle S. The key role of forest disturbance in reconciling estimates of the northern carbon sink pub ASA EM ECE IACC Northern forests are an important carbon sink, but our understanding of the driving factors is limited due to discrepancies between dynamic global vegetation models (DGVMs) and atmospheric inversions. We show that DGVMs simulate a 50% lower sink (1.1 ± 0.5 PgC yr−1 over 2001–2021) across North America, Europe, Russia, and China compared to atmospheric inversions (2.2 ± 0.6 PgC yr−1). We explain why DGVMs underestimate the carbon sink by considering how they represent disturbance processes, specifically the overestimation of fire emissions, and the lack of robust forest demography resulting in lower forest regrowth rates than observed. We reconcile net sink estimates by using alternative disturbance-related fluxes. We estimate carbon uptake through forest regrowth by combining satellite-derived forest age and biomass maps. We calculate a regrowth flux of 1.1 ± 0.1 PgC yr−1, and combine this with satellite-derived estimates of fire emissions (0.4 ± 0.1 PgC yr−1), land-use change emissions from bookkeeping models (0.9 ± 0.2 PgC yr−1), and the DGVM-estimated sink from CO2 fertilisation, nitrogen deposition, and climate change (2.2 ± 0.9 PgC yr−1). The resulting ‘bottom-up’ net flux of 2.1 ± 0.9 PgC yr−1 agrees with atmospheric inversions. The reconciliation holds at regional scales, increasing confidence in our results. 2024-11-15 published Nature Publishing Group doi:10.1038/s43247-024-01827-4 2885 public Communications Earth & Environment 5 1 e705 TRUE 2662-4435 no info:eu-repo/semantics/article