Bomb radiocarbon evidence for strong global carbon uptake and turnover in terrestrial vegetation

• 成果类型: Article
• 署名作者: Graven, Heather D.; Warren, Hamish; Gibbs, Holly K.; Khatiwala, Samar; Koven, Charles; Lester, Joanna; Levin, Ingeborg; Spawn-Lee, Seth A.; Wieder, Will
• 署名单位: Imperial College London; University of Wisconsin System; University of Wisconsin Madison; University of Wisconsin System; University of Wisconsin Madison; University of Oxford; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; Ruprecht Karls University Heidelberg; University of Wisconsin System; University of Wisconsin Madison; Nature Conservancy; National Center Atmospheric Research (NCAR) - USA; University of Colorado System; University of Colorado Boulder; University of Colorado System; University of Colorado Boulder
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12219
• DOI: 10.1126/science.adl4443
• 发表日期: 2024-06-21
• 页码: 1335-1339
• 关键词: net primary production; earth system models; atmospheric co2; gross; constraints; isotopes; IMPACT

摘要

Vegetation and soils are taking up approximately 30% of anthropogenic carbon dioxide emissions because of small imbalances in large gross carbon exchanges from productivity and turnover that are poorly constrained. We combined a new budget of radiocarbon produced by nuclear bomb testing in the 1960s with model simulations to evaluate carbon cycling in terrestrial vegetation. We found that most state-of-the-art vegetation models used in the Coupled Model Intercomparison Project underestimated the radiocarbon accumulation in vegetation biomass. Our findings, combined with constraints on vegetation carbon stocks and productivity trends, imply that net primary productivity is likely at least 80 petagrams of carbon per year presently, compared with the 43 to 76 petagrams per year predicted by current models. Storage of anthropogenic carbon in terrestrial vegetation is likely more short-lived and vulnerable than previously predicted.