Atmospheric Chemistry and Physics

• Main Authors: Firn Air, J. E. Dibb, L. D. Ziemba, J. Luxford, P. Beckman
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2010
• Subjects: Greenland
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.612.1332; http://www.atmos-chem-phys.net/10/9931/2010/acp-10-9931-2010.pdf

Abstract. Measurements of gas phase soluble bromide in the boundary layer and in firn air, and Br − in aerosol and snow, were made at Summit, Greenland (72.5 ◦ N, 38.4 ◦ W, 3200 m a.s.l.) as part of a larger investigation into the in-fluence of Br chemistry on HOx cycling. The soluble bro-mide measurements confirm that photochemical activation of Br − in the snow causes release of active Br to the over-lying air despite trace concentrations of Br − in the snow (means 15 and 8 nmol Br − kg−1 of snow in 2007 and 2008, respectively). Mixing ratios of soluble bromide above the snow were also found to be very small (mean < 1 ppt both years, with maxima of 3 and 4 ppt in 2007 and 2008, respec-tively), but these levels clearly oxidize and deposit long-lived gaseous elemental mercury and may perturb HOx partition-ing. Concentrations of Br − in surface snow tended to in-