Validation of contour advection simulations with airborne lidar measurements of filaments during the Second European Stratospheric Arctic and Midlatitude Experiment (SESAME)

摘要: Airborne lidar measurements of vertical sections ozone and aerosol across the lower stratospheric vortex boundary during Arctic winter 1994/1995 are used to study permeability this dynamical barrier. Both constituents exhibit strong gradients in levels edge substantial structure at subsynoptic scales surrounding surf zone. These provide validation two-dimensional (2-D) Contour Advection (CA) calculations which use potential vorticity (PV) as a proxy tracer. The CA initialized from gridded U.K. Meteorological Office analyses thus may smooth subgrid scale structures. reproduces most observed filaments with an accuracy few tenths degree, but neglect diabatic effects causes small errors. show that arctic stratosphere was dynamically disturbed over extended periods by breaking planetary waves indicated numerous spiral-like PV surrounded polar vortex. transport rate due filamentation subsequent detachment off can be inferred model calculations. In 1994/1995, two wave events eroded area 8% 40% 450 K 22% 60% 600 K. A third event triggered final warming. Since air partly chemically disturbed, cross transport, together effective catalytic destruction cycles, has considerable for reducing concentrations midlatitudes.