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

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 CO 2 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.

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Related Links

Related Dataset #1 : GlobBiomass - global datasets of forest biomass

Related Dataset #2 : Global CO2 gridded flux fields from 14 atmospheric inversions in GCB2023

Related Dataset #3 : CCMI nitrogen surface fluxes in support of CMIP6 - version 2.0

Related Dataset #4 : Forest Regrowth Carbon Gains Data for publication: The key role of forest disturbance in reconciling estimates of the northern carbon sink

Related Dataset #5 : Gridded fossil CO2 emissions and related O2 combustion consistent with national inventories
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Author 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.
Houghton, R. A.
Jain, A. K.
Kato, E.
Kennedy, Daniel
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.
Publisher UCAR/NCAR - Library
Publication Date 2024-12-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2025-07-10T19:56:20.407372
Metadata Record Identifier edu.ucar.opensky::articles:42176
Metadata Language eng; USA
Suggested Citation 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., Houghton, R. A., Jain, A. K., Kato, E., Kennedy, Daniel, 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.. (2024). The key role of forest disturbance in reconciling estimates of the northern carbon sink. UCAR/NCAR - Library. https://n2t.net/ark:/85065/d7g1654z. Accessed 11 August 2025.

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