Important contributions of sea-salt aerosols to atmospheric bromine cycle in the Antarctic coasts.

ABSTRACT: Polar sunrise activates reactive bromine (BrO_x) cycle on the Antarctic coasts. BrO_x chemistry relates to depletion of O₃ and Hg in polar regions. Earlier studies have indicated "blowing snow" as a source of atmospheric BrO_x. However, surface O₃ depletion and BrO enhancement occurs rarely under blowing snow conditions at Syowa Station, Antarctica. Therefore, trigger processes for BrO_x activation other than the heterogeneous reactions on blowing snow particles must be considered. Results of this study show that enhancement of sea-salt aerosols (SSA) and heterogeneous reactions on SSA are the main key processes for atmospheric BrO_x cycle activation. Blowing snow had Br^- enrichment, in contrast to strong Br

SUBMITTER: Hara K 

PROVIDER: S-EPMC6138753 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature