Low latency carbon budget analysis reveals a large decline of the land carbon sink in 2023.

ABSTRACT: In 2023, the CO₂ growth rate was 3.37 ± 0.11 ppm at Mauna Loa, which was 86% above that of the previous year and hit a record high since observations began in 1958, while global fossil fuel CO₂ emissions only increased by 0.6% ± 0.5%. This implies an unprecedented weakening of land and ocean sinks, and raises the question of where and why this reduction happened. Here, we show a global net land CO₂ sink of 0.44 ± 0.21 GtC yr^-1, which is the weakest since 2003. We used dynamic global vegetation models, satellite fire emissions, an atmospheric inversion based on OCO-2 measurements and emulators of ocean biogeochemical and data-driven models to deliver a fast-track carbon budget in 2023. Those models ensured consistency with previous carbon budgets.

SUBMITTER: Ke P 

PROVIDER: S-EPMC11648560 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature