Multiphase halogen chemistry in the tropical atlantic ocean
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...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
June 1, 2012
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| In: |
Environmental science & technology
Year: 2012, Volume: 46, Issue: 19, Pages: 10429-10437 |
| ISSN: | 1520-5851 |
| DOI: | 10.1021/es300209f |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1021/es300209f Verlag, Volltext: https://doi.org/10.1021/es300209f 
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| Author Notes: | Roberto Sommariva and Roland von Glasow |
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| 520 | |a 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. | ||
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