Role of stabilized Criegee Intermediates in the formation of atmospheric sulfate in eastern United States Academic Article uri icon

abstract

  • A Community Multiscale Air Quality model with the Master Chemical Mechanism is applied to evaluate the reactions of stabilized Criegee Intermediates SCIs with SO2(kSCI+SO2) on sulfate aerosols in the eastern United States (US) during the summer of 2006. Surface sulfate concentrations and total sulfate columns increased by as much as 18% and 6%, respectively, when (kSCI+SO2) was increased from 710-14cm3s-1 to a suggested value of 3.910-11cm3s-1. The episode-average increase of the top-of-atmosphere direct radiative forcing due to the additional sulfate can be as much as-0.7Wm-2 (5%). However, if the SCI+H2O reaction rate constant (kSCI+H2O) was also increased based on the reported ratio of kSCI+H2O to (kSCI+SO2) (6.110-5), the surface sulfate and total sulfate column increases were less than 0.5%, which suggests that the impact of SCIs on sulfate may be insignificant and additional studies are needed to better determine kSCI+H2O. Small SCIs such as CH2OO and CH3CHOO, and SCIs from isoprene (MVKOO) and monoterpene (APINBOO) oxidation are the dominant SCIs in the eastern US. 2013 Elsevier Ltd.

published proceedings

  • ATMOSPHERIC ENVIRONMENT

author list (cited authors)

  • Li, J., Ying, Q. i., Yi, B., & Yang, P.

citation count

  • 32

complete list of authors

  • Li, Jingyi||Ying, Qi||Yi, Bingqi||Yang, Ping

publication date

  • November 2013