Journal
ATMOSPHERIC ENVIRONMENT
Volume 43, Issue 9, Pages 1660-1665Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2008.12.010
Keywords
HOx radical; Sea-salt aerosol; Uptake coefficient; Atmospheric chemistry; Laboratory study
Funding
- Global Environmental Research Fund [B-051]
- Japan Ministry of Environment
- Grant-in-Aid for Scientific Research (KAKENHI) (C) [19510026]
- Grants-in-Aid for Scientific Research [19510026] Funding Source: KAKEN
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The HO2 uptake to aerosol particles is potentially significant sink for the HO2 radical in the marine atmosphere. To assess the heterogeneous loss of HO2 on marine aerosol particles, we have investigated the uptake coefficients (y) of HO2 for submicron aerosol particles of KCl, synthetic sea salt, and natural seawater under ambient conditions (760 Torr and 296 +/- 2 K) using an aerosol flow tube (AFT) coupled with a chemical conversion/laser-induced fluorescence (CC/LIF) technique. gamma values determined for dry and wet aerosols of KCl were 0.02 +/- 0.01 and 0.07 +/- 0.03 at 66% and 75% RH, respectively, while gamma values for those doped with CuSO4 was 0.55 +/- 0.19 at 75% RH. gamma values determined for synthetic sea-salt particles were 0.07 +/- 0.03, 0.12 +/- 0.04 and 0.13 +/- 0.04 at 35%, 50%, 75% RH, respectively, while gamma values for natural seawater particles were 0.10 +/- 0.03, 0.11 +/- 0.02 and 0.10 +/- 0.03 at 35%, 50%, 75% RH, respectively. We recommend a HO2 uptake coefficient in marine areas of 0.1 for modeling and estimated the contribution of heterogeneous loss of HO2 by sea-salt aerosol particles in marine areas using a box model. Our box-model simulations suggested that daytime maximum HO2 concentrations decreased to 87-94% of the values without heterogeneous loss. (C) 2008 Elsevier Ltd. All rights reserved.
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