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Auditing the Global Carbon Budget: Exploring the 2024--2025 Vintage Shift — arXiv:2608.11821

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.11821
License (as archived): CC0-1.0
Archived: 2026-10-19T05:43:51.016Z
SHA-256 of the archived text: 5debe12b5094c924d095b8f30f2dce80708d6ec9e243bf77dc206deef8165bfb
Stable URL of this page: https://metraipolis.com/documento/dc_bf67321f0050

How to cite

Auditing the Global Carbon Budget: Exploring the 2024--2025 Vintage Shift — arXiv:2608.11821 — arXiv (en), https://arxiv.org/abs/2608.11821 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_bf67321f0050 (Metraipolis archive dc_bf67321f0050, sha256 5debe12b5094c924d095b8f30f2dce80708d6ec9e243bf77dc206deef8165bfb)

BibTeX

@misc{dcbf67321f0050,
  title = {Auditing the Global Carbon Budget: Exploring the 2024--2025 Vintage Shift — arXiv:2608.11821},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.11821},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_bf67321f0050; sha256 5debe12b5094c924d095b8f30f2dce80708d6ec9e243bf77dc206deef8165bfb},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.11821. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The Global Carbon Budget (GCB), the community reference dataset for the carbon cycle, is reissued annually. The 2025 release introduces several adjustments to the published series that we compare with prior releases starting in 2017. On a common 1959-2016 sample, the mean of the GCB budget imbalance jumps from within +/-0.17 GtC/yr of zero for every vintage 2017-2024 to 0.61 GtC/yr in 2025, the only vintage whose 95% confidence interval for the imbalance mean excludes zero. The size of the imbalance changes much less: its mean absolute value rises from 0.61 to 0.76 GtC/yr. It is the mean, the quantity the budget identity constrains, that moves. We document and explore this shift in two ways. First, we conduct a model-free analysis, where we attribute the shift to a new adjustment that places the published land sink 0.40 GtC/yr below its ensemble mean (the average of the underlying models), a smaller adjustment in the ocean sink in the opposite direction, and a change in the composition of the bookkeeping ensemble. Second, we consider a dynamic statistical GCB model augmented with climate covariates. Its parameters are estimated for every GCB vintage 2017-2025. The coefficients of atmospheric concentrations in the sink equations shift in opposite directions on the 2025 issue, mirroring the model-free findings. A constant in the budget equation, statistically unnecessary in every vintage from 2017-2024, is required in 2025 and is estimated at -0.59 (0.09) GtC/yr. There is a persistent drifting imbalance across the entire sample in the budget equation. Each of the three adjustments is documented in the 2025 release and rests on evidence about the component it corrects. Their joint effect is a budget that closes over the last ten years and carries a mean imbalance of 0.61 GtC/yr over the full record. We argue that this cost to the full sample outweighs the gain on the last ten years.

Tema degli esploratori: statistica e scienza dei dati (retro-catalogo arXiv: annunci del 2026-08-13 in stat.AP).
Categorie arXiv: Applications (stat.AP).
Pagina del lavoro: https://arxiv.org/abs/2608.11821 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-19T05:32:39.952Z dalla pagina https://arxiv.org/catchup/stat.AP/2026-08-13?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).