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A consistent budgeting of terrestrial carbon fluxes

Author

Listed:
  • Lea Dorgeist

    (Ludwig-Maximilians-Universität)

  • Clemens Schwingshackl

    (Ludwig-Maximilians-Universität)

  • Selma Bultan

    (Ludwig-Maximilians-Universität)

  • Julia Pongratz

    (Ludwig-Maximilians-Universität
    Max Planck Institute for Meteorology)

Abstract

Accurate estimates of CO2 emissions from anthropogenic land-use change (ELUC) and of the natural terrestrial CO2 sink (SLAND) are crucial to precisely know how much CO2 can still be emitted to meet the goals of the Paris Agreement. In current carbon budgets, ELUC and SLAND stem from two model families that differ in how CO2 fluxes are attributed to environmental and land-use changes, making their estimates conceptually inconsistent. Here we provide consistent estimates of ELUC and SLAND by integrating environmental effects on land carbon into a spatially explicit bookkeeping model. We find that state-of-the-art process-based models overestimate SLAND by 23% (min: 8%, max: 33%) in 2012–2021, as they include hypothetical sinks that in reality are lost through historical ecosystem degradation. Additionally, ELUC increases by 14% (8%, 23%) in 2012–2021 when considering environmental effects. Altogether, we find a weaker net land sink, which makes reaching carbon neutrality even more ambitious. These results highlight that a consistent estimation of terrestrial carbon fluxes is essential to assess the progress of net-zero emission commitments and the remaining carbon budget.

Suggested Citation

  • Lea Dorgeist & Clemens Schwingshackl & Selma Bultan & Julia Pongratz, 2024. "A consistent budgeting of terrestrial carbon fluxes," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51126-x
    DOI: 10.1038/s41467-024-51126-x
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