Multiannual simulations with a three‐dimensional chemical transport model

摘要: An off-line three-dimensional stratospheric chemical transport model (CTM) has been developed and integrated in a series of 6-year experiments covering 1991 to 1997. The detailed chemistry scheme is forced by the meteorological analyses for temperatures horizontal winds, while vertical motion diagnosed using radiation scheme. By analyses, captures interannual variability chlorine activation Arctic winter lower stratosphere, as well much more regular, strong Antarctic. fields show generally good agreement with long time ground-based observations. In particular, simulations column O3 are excellent terms capturing magnitude day-to-day, seasonal, variations at all latitudes. However, large model/observation discrepancy occurs high latitudes during summer, when overestimates profile throughout mid-stratosphere. also reproduces many features observations HCl, ClONO2, HNO3, NO2, such short-term variability, seasonal cycles, winter/spring enhancements ClONO2 northern midlatitudes. running without cold, activating heterogeneous reactions effect polar (and subpolar) processing on midlatitudes estimated. Polar results 2–3% less 50°N year, around 5% 50°S. Direct enhanced midlatitude aerosol contributes 1% ozone depletion mid low early 1992. caused reductions 3% 45°N 1992 1993. CTM runs confirm suggestion dynamical (which may be partly driven radiative effects aerosols) contributed negative anomaly 1992/1993.