Suppression of CCN formation by bromine chemistry in the remote marine atmosphere

Abstract Using a global model, we investigate how bromine chemistry affects cloud condensation nuclei ( CCN ) formation in the remote marine atmosphere. Bromine increases dimethylsulphide ( DMS ) oxidation but lowers SO 2 yield, leading to less sulphate aerosol. The effect is largest (3–7% decrease...

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Bibliographic Details
Published in:Atmospheric Science Letters
Main Authors: Breider, Thomas James, Chipperfield, Martyn P., Mann, Graham W., Woodhouse, Matthew T., Carslaw, Ken S.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2014
Subjects:
Southern Ocean
Online Access:http://dx.doi.org/10.1002/asl2.539
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fasl2.539
https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/asl2.539
Description
Summary:Abstract Using a global model, we investigate how bromine chemistry affects cloud condensation nuclei ( CCN ) formation in the remote marine atmosphere. Bromine increases dimethylsulphide ( DMS ) oxidation but lowers SO 2 yield, leading to less sulphate aerosol. The effect is largest (3–7% decrease in total CCN and 15–30% decrease in CCN from DMS ) over the summertime southern ocean, a region of strong bromine release from sea‐salt. DMS and bromine emissions have a coupled feedback effect on CCN . Increased DMS enhances the release of sea‐salt bromine through increased aerosol acidity. This enhanced bromine suppresses the CCN response to increased DMS by up to 30%.

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