Influence of sea‐ice‐derived halogens on atmospheric HOx as observed in springtime coastal Antarctica

Brough, Neil; Jones, Anna E. ORCID:; Griffiths, Paul T.. 2019 Influence of sea‐ice‐derived halogens on atmospheric HOx as observed in springtime coastal Antarctica. Geophysical Research Letters, 46 (16). 10168-10176.

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We present first observations of OH and (HO2 + RO2) carried out in Antarctica outside the summer season. Measurements were made over 23 days in spring at the coastal Antarctic station Halley. Increases in concentrations were evident during the measurement period due to rapidly increasing solar irradiance, and clear diurnal cycles were present throughout. There were also notable differences in air mass composition depending on wind direction. Air masses that had traversed the sea‐ice‐zone had both higher concentrations of OH and a larger OH:(HO2 + RO2) ratio. We use steady‐state kinetic arguments and a 0‐D box model to probe the chemical drivers. We find that differences in bromine chemistry, previously measured at Halley, are sufficient to account for the observed differences in OH concentration as well as the ratio. There is some evidence also that chlorine chemistry is influencing concentrations of RO2.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 0094-8276
Additional Keywords: Bromine chemistry, OH and HO2+RO2, sea ice zone, polar, Antarctica, springtime
Date made live: 20 Aug 2019 14:44 +0 (UTC)

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