A three-dimensional model study of long-term mid-high latitude lower stratosphere ozone changes

[摘要] We have used a 3D off-line chemical transport model (CTM) to studythe causes of the observed changes in ozone in the mid-high latitude lower stratosphere from1979-1998. The model was forced by European Centre for Medium Range WeatherForecasts (ECMWF) analyses and contains a detailed chemistry scheme. A series of model runs wereperformedat a horizontal resolution of 7.5°x7.5° and covered the domain from about12 km to 30 km. The basic model performs well in reproducing the decadal evolution ofthe springtime depletion of ozone in the northern hemisphere (NH) and southernhemisphere (SH) high latitudes in the 1980s and early 1990s. After about 1994 the modelled interannual variability does not match theobservations as well, which is probably due in part to changes in the operational ECMWF analyses- which places limits on using this dataset to diagnose dynamical trends. For mid-latitudes(35°-60°) the basic model reproduces the observed column ozone decreases from 1980 untilthe early 1990s. Model experiments show that the halogen trends appear to dominate this modelled decrease and of this around30-50% is due to high-latitude processing on polar stratospheric clouds (PSCs). Dynamically induced ozone variations in the model correlatewith observations over the timescale of a few years. Large discrepancies between the modelled and observed variations in the mid 1980s and mid 1990scan be largely resolved by assuming that the 11-year solar cycle (not explicitly included in the 3D model)causes a 2% (min-max) change in mid-latitude column ozone.

[学科分类] 大气科学