Reconciling ice core CO 2 and land-use change following New World-Old World contact.

Autor: King ACF; British Antarctic Survey, Cambridge, UK. amyking@bas.ac.uk., Bauska TK; British Antarctic Survey, Cambridge, UK., Brook EJ; College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA., Kalk M; College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA., Nehrbass-Ahles C; Department of Earth Sciences, University of Cambridge, Cambridge, UK.; National Physical Laboratory, Teddington, UK., Wolff EW; Department of Earth Sciences, University of Cambridge, Cambridge, UK., Strawson I; British Antarctic Survey, Cambridge, UK.; Department of Earth Sciences, University of Cambridge, Cambridge, UK., Rhodes RH; Department of Earth Sciences, University of Cambridge, Cambridge, UK., Osman MB; Department of Geography, University of Cambridge, Cambridge, UK.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Mar 05; Vol. 15 (1), pp. 1735. Date of Electronic Publication: 2024 Mar 05.
DOI: 10.1038/s41467-024-45894-9
Abstrakt: Ice core records of carbon dioxide (CO 2 ) throughout the last 2000 years provide context for the unprecedented anthropogenic rise in atmospheric CO 2 and insights into global carbon cycle dynamics. Yet the atmospheric history of CO 2 remains uncertain in some time intervals. Here we present measurements of CO 2 and methane (CH 4 ) in the Skytrain ice core from 1450 to 1700 CE. Results suggest a sudden decrease in CO 2 around 1610 CE in one widely used record may be an artefact of a small number of anomalously low values. Our analysis supports a more gradual decrease in CO 2 of 0.5 ppm per decade from 1516 to 1670 CE, with an inferred land carbon sink of 2.6 PgC per decade. This corroborates modelled scenarios of large-scale reorganisation of land use in the Americas following New World-Old World contact, whereas a rapid decrease in CO 2 at 1610 CE is incompatible with even the most extreme land-use change scenarios.
(© 2024. Crown.)
Databáze: MEDLINE
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