Halogen activation via interactions with environmental ice and snow in the polar lower troposphere and other regions. - Abbatt, J. P. D.; Thomas, J. L.; Abrahamsson, K.; Boxe, C.; Granfors, A.; Jones, A. E.; King, M. D.; Saiz-Lopez, A.; Shepson, P. B.; Sodeau, J.; Toohey, D. W.; Toubin, C.; et al. (Atmospheric Chemistry & Physics, 2012)