کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6341625 | 1620392 | 2013 | 6 صفحه PDF | دانلود رایگان |
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 7 Ã 10â14 cm3 sâ1 to a suggested value of 3.9 Ã 10â11 cm3 sâ1. The episode-average increase of the top-of-atmosphere direct radiative forcing due to the additional sulfate can be as much as â0.7 W mâ2 (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) (6.1 Ã 10â5), 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.
Journal: Atmospheric Environment - Volume 79, November 2013, Pages 442-447