Dark brown carbon from wildfires: a potent snow radiative forcing agent?

ABSTRACT: Deposition of wildfire smoke on snow contributes to its darkening and accelerated snowmelt. Recent field studies have identified dark brown carbon (d-BrC) to contribute 50-75% of shortwave absorption in wildfire smoke. d-BrC is a distinct class of water-insoluble, light-absorbing organic carbon that co-exists in abundance with black carbon (BC) in snow across the world. However, the importance of d-BrC as a snow warming agent relative to BC remains unexplored. We address this gap using aerosol-snow radiative transfer calculations on datasets from laboratory and field measurement. We show d-BrC increases the annual mean snow radiative forcing between 0.6 and 17.9 W m^{- 2}, corresponding to different wildfire smoke deposition scenarios. This is a 1.6 to 2.1-fold enhanceme

SUBMITTER: Chelluboyina GS 

PROVIDER: S-EPMC11357999 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature