Data Assimilation and Model Calculations to Study Chemistry Climate Interactions in the Stratosphere

摘要: The variability of polar stratospheric ozone is investigated through analysis a new long-term global data set, and model calculations. A 29-year set was generated assimilation satellite observations into chemical transport model. An this shows patterns positive negative anomalies at high latitudes during winter; the often develop in mid- to upper stratosphere early winter descend lower following months, persisting for up five months. These are related Annular Modes. Another less frequent class solar proton events (SPEs). Although Arctic persist several descending from stratosphere, we find no further evidence close correlation between mid-stratospheric autumn total spring, agreement with an calculations chemistry climate EMAC. In order test how may influence dynamics, performed sensitivity runs EMAC imposed anomalies. studies show that initial perturbation conditions do have long term effect on behaviour vortex troposphere as whole but it not strong enough prevent tropospheric propagating impacting stratosphere.