Ozone depletion events observed in the high latitude surface layer during the TOPSE aircraft program - Ridley, BA; Atlas, EL; Montzka, DD; Browell, EV; Cantrell, CA; Blake, DR; Blake, NJ; Cinquini, L; Coffey, MT; Emmons, LK; Cohen, RC; DeYoung, RJ; et al. (eScholarship, University of California, 2003)