Reduced anthropogenic aerosol radiative forcing caused by biogenic new particle formation.

ABSTRACT: The magnitude of aerosol radiative forcing caused by anthropogenic emissions depends on the baseline state of the atmosphere under pristine preindustrial conditions. Measurements show that particle formation in atmospheric conditions can occur solely from biogenic vapors. Here, we evaluate the potential effect of this source of particles on preindustrial cloud condensation nuclei (CCN) concentrations and aerosol-cloud radiative forcing over the industrial period. Model simulations show that the pure biogenic particle formation mechanism has a much larger relative effect on CCN concentrations in the preindustrial atmosphere than in the present atmosphere because of the lower aerosol concentrations. Consequently, preindustrial cloud albedo is increased more than under present day conditions,

SUBMITTER: Gordon H 

PROVIDER: S-EPMC5087035 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature