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Radiocarbon constraints imply reduced carbon uptake by soils during the 21st century

He, Yujie ; Trumbore, Susan E. ; Torn, Margaret S. ; Harden, Jennifer W. ; Vaughn, Lydia J. S. ; Allison, Steven D. ; Randerson, James T.

Science (American Association for the Advancement of Science), 2016-09, Vol.353 (6306), p.1419-1424 [Periódico revisado por pares]

United States: American Association for the Advancement of Science

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  • Título:
    Radiocarbon constraints imply reduced carbon uptake by soils during the 21st century
  • Autor: He, Yujie ; Trumbore, Susan E. ; Torn, Margaret S. ; Harden, Jennifer W. ; Vaughn, Lydia J. S. ; Allison, Steven D. ; Randerson, James T.
  • Assuntos: Carbon ; Carbon dioxide ; Dynamical systems ; Dynamics ; Earth ; ENVIRONMENTAL SCIENCES ; Mathematical models ; Reservoirs ; Soils ; Terrestrial ecosystems ; Uptakes
  • É parte de: Science (American Association for the Advancement of Science), 2016-09, Vol.353 (6306), p.1419-1424
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    AC02-05CH11231; SC0014374
    USDOE Office of Science (SC), Biological and Environmental Research (BER)
  • Descrição: Soil is the largest terrestrial carbon reservoir and may influence the sign and magnitude of carbon cycle-climate feedbacks. Many Earth system models (ESMs) estimate a significant soil carbon sink by 21OO, yet the underlying carbon dynamics determining this response have not been systematically tested against observations. We used ¹⁴C data from 157 globally distributed soil profiles sampled to 1-meter depth to show that ESMs underestimated the mean age of soil carbon by a factor of more than six (430 ± 50 years versus 3100 ± 1800 years). Consequently, ESMs overestimated the carbon sequestration potential of soils by a factor of nearly two (40 ± 27%). These inconsistencies suggest that ESMs must better represent carbon stabilization processes and the turnover time of slow and passive reservoirs when simulating future atmospheric carbon dioxide dynamics.
  • Editor: United States: American Association for the Advancement of Science
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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