Historical Southern Hemisphere biomass burning variability inferred from ice core carbon monoxide records - Archive ouverte HAL
Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2024

Historical Southern Hemisphere biomass burning variability inferred from ice core carbon monoxide records

Ivo Strawson
  • Fonction : Auteur
Thomas Bauska
  • Fonction : Auteur
Francesco Muschitiello
  • Fonction : Auteur
Diana Vladimirova
Dieter Tetzner
  • Fonction : Auteur
Jack Humby
  • Fonction : Auteur
Elizabeth Thomas
  • Fonction : Auteur
Pengfei Liu
  • Fonction : Auteur
Bingqing Zhang
Rachael Rhodes

Résumé

Biomass burning plays an important role in climate-forcing and atmospheric chemistry. The drivers of fire activity over the past two centuries, however, are hotly debated and fueled by poor constraints on the magnitude and trends of preindustrial fire regimes. As a powerful tracer of biomass burning, reconstructions of paleoatmospheric carbon monoxide (CO) can provide valuable information on the evolution of fire activity across the preindustrial to industrial transition. Here too, however, significant disagreements between existing CO records currently allow for opposing fire histories. In this study, we reconstruct a continuous record of Antarctic ice core CO between 1821 and 1995 CE to overlap with direct atmospheric observations. Our record indicates that the Southern Hemisphere CO burden ([CO]) increased by 50% from a preindustrial mixing ratio of ca. 35 ppb to ca. 53 ppb by 1995 CE with more variability than allowed for by state-of-the-art chemistry-climate models, suggesting that historic CO dynamics have been not fully accounted for. Using a 6-troposphere box model, a 40 to 50% decrease in Southern Hemisphere biomass-burning emissions, coincident with unprecedented rates of early 20th century anthropogenic land-use change, is identified as a strong candidate for this mismatch.
Fichier non déposé

Dates et versions

hal-04702110 , version 1 (19-09-2024)

Identifiants

Citer

Ivo Strawson, Xavier Faïn, Thomas Bauska, Francesco Muschitiello, Diana Vladimirova, et al.. Historical Southern Hemisphere biomass burning variability inferred from ice core carbon monoxide records. Proceedings of the National Academy of Sciences of the United States of America, 2024, 121 (33), ⟨10.1073/pnas.2402868121⟩. ⟨hal-04702110⟩
12 Consultations
0 Téléchargements

Altmetric

Partager

More