Multiphase Halogen Chemistry in the Tropical Atlantic Ocean

Sommariva, Roberto and von Glasow, Roland (2012) Multiphase Halogen Chemistry in the Tropical Atlantic Ocean. Environmental Science & Technology, 46 (19). pp. 10429-10437. ISSN 0013-936X

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We used a one-dimensional model to simulate the chemical evolution of air masses in the tropical Atlantic Ocean, with a focus on halogen chemistry. The model results were compared to the observations of inorganic halogen species made in this region. The model could largely reproduce the measurements of most chlorine species, especially under unpolluted conditions, but overestimated sea salt chloride, BrCl, and bromine species. Agreement with the measurements could be improved by taking into account the reactivity with aldehydes and the effects of dimethyl sulfide (DMS) and Saharan dust on aerosol pH; a hypothetical HOX → X– aqueous-phase reaction could also improve the agreement with measured Cl2 and HOCl, especially under semipolluted conditions. The results also showed that halogens speciation and concentrations are very sensitive to cloud processing. The model was used to calculate the impact of the observed levels of halogens: Cl atoms accounted for 5.4–11.6% of total methane sinks and halogens (mostly bromine and iodine) accounted for 35–40% of total ozone destruction.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Users 2731 not found.
Date Deposited: 15 Jan 2013 12:38
Last Modified: 09 Nov 2022 15:31
DOI: 10.1021/es300209f

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