An Investigation of CIO Photchemistry in the Chemically Perturbed Arctic Vortex

摘要: A new lightweight in situ instrument designed to measure ClO was flown on a balloon launched into the arctic vortex at dawn February 3, 1995 Kiruna, Sweden during Second European Stratospheric Arctic and Mid-latitude Experiment (SESAME), together with instruments ozone long-lived tracers. Observations ascent descent different solar zenith angles are compared results from Lagrangian box model calculations that assume airmasses similar potential temperatures had comparable photochemical histories. Between 20 22 km, region where significantly enhanced, constrained by currently recommended rate parameters underestimates abundances of were observed high angles, whereas agreement is much better if smaller ClO-Cl2O2 equilibrium constant, one inferred previous ER-2 aircraft observations nighttime, assumed. On ascent, additionally enhanced narrow between 21 km. We believe most plausible explanation for this feature rapid photolysis OClO produced slow bimolecular reaction + over 48 hours prior when airmass warmed 225 K adiabatic compression while polar darkness. These suggest under special circumstances, can be other than involving BrO, and, hence, not necessarily universal proxy BrO perturbed vortex.