Variability of ozone loss during Arctic winter (1991–2000) estimated from UARS Microwave Limb Sounder measurements

摘要: [1] A comprehensive analysis of version 5 (V5) Upper Atmosphere Research Satellite (UARS) Microwave Limb Sounder (MLS) ozone data using a Lagrangian transport (LT) model provides estimates chemical depletion for the 1991–1992 through 1997–1998 Arctic winters. These new give consistent, three-dimensional picture loss during seven winters; previous from MLS were based on various earlier versions and done only late winter subset years observed by MLS. We find large interannual variability in amount, timing, patterns degree to which is masked dynamical processes. Analyses long-lived trace gas suggest that LT sometimes overestimates descent at levels above ∼520 K, so we have most confidence results lower levels. When vortex shifted off pole cold region near edge (e.g., 1993 1996), rapid occurs edge; when are pole-centered 1994 1997), takes place core. severe 1995–1996, with about 1.3 ppmv cumulative 465 K 3 March 1996; ∼1.0 seen mid-March 1993. show significant January years, ranging ∼0.3 0.6 K. A modified used limited 2000 gives rough ∼0.04 0.006–0.012 ppmv/day 2–12 February 12 February–29 2000, respectively, broadly consistent other studies 1999–2000 winter. Estimates column 100 hPa considerably smaller than reported estimates, primarily because many include below does not continuously observe after early spring. Our analyses confirm conclusions broad overall agreement between stratosphere 450–480