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Article Dans Une Revue Science Advances Année : 2024

Threefold reduction of modeled uncertainty in direct radiative effects over biomass burning regions by constraining absorbing aerosols

Qirui Zhong
Nick Schutgens
Guido van der Werf
Toshihiko Takemura
Twan van Noije
Tero Mielonen
Ulrike Lohmann
Alf Kirkevåg
  • Fonction : Auteur
Dirk J. L. Olivié
  • Fonction : Auteur
Harri Kokkola
Hitoshi Matsui
Zak Kipling
Paul Ginoux
Philippe Le Sager
Samuel Rémy
Huisheng Bian
Mian Chin
Kai Zhang
Susanne Bauer
  • Fonction : Auteur
Kostas Tsigaridis

Résumé

Absorbing aerosols emitted from biomass burning (BB) greatly affect the radiation balance, cloudiness, and circulation over tropical regions. Assessments of these impacts rely heavily on the modeled aerosol absorption from poorly constrained global models and thus exhibit large uncertainties. By combining the AeroCom model ensemble with satellite and in situ observations, we provide constraints on the aerosol absorption optical depth (AAOD) over the Amazon and Africa. Our approach enables identification of error contributions from emission, lifetime, and MAC (mass absorption coefficient) per model, with MAC and emission dominating the AAOD errors over Amazon and Africa, respectively. In addition to primary emissions, our analysis suggests substantial formation of secondary organic aerosols over the Amazon but not over Africa. Furthermore, we find that differences in direct aerosol radiative effects between models decrease by threefold over the BB source and outflow regions after correcting the identified errors. This highlights the potential to greatly reduce the uncertainty in the most uncertain radiative forcing agent.
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Dates et versions

hal-04624514 , version 1 (25-06-2024)

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Qirui Zhong, Nick Schutgens, Guido van der Werf, Toshihiko Takemura, Twan van Noije, et al.. Threefold reduction of modeled uncertainty in direct radiative effects over biomass burning regions by constraining absorbing aerosols. Science Advances , 2024, 9 (48), ⟨10.1126/sciadv.adi3568⟩. ⟨hal-04624514⟩
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