Influences On The Stratospheric Ozone Profile On Time-scales From Years To Decades
Abstract
In recent years, connections between day to day fluctuations of stratospheric ozone and meteorological parameters [Dobson et al., 1929] have gained new importance for the interpretation of long-term changes. It now appears that meteorological change can account for a substantial part of the observed mid-latitude ozone trend [e.g., Peters et al., 1996; Hood et al., 1999; Appenzeller et al., 2000].
An improved version of a standard multiple linear regression scheme, including terms for linear trend, 11-year solar cycle, stratospheric aerosol, QBO, ENSO, and in par- ticular tropospheric meteorological parameters [Steinbrecht et al., 2001], is used here to quantify influences on stratospheric ozone as a function of altitude and season. The investigation is based on monthly means of ozone observed at Hohenpeissenberg (48o N, 11o E) over the altitude ranges 1 to 30 km by Brewer/Mast sondes since 1967, and 20 to 50 km by Lidar since 1987. A significant linear trend in ozone is found throughout most of the stratosphere and all four seasons. The largest depletions occur in winter (DJF) around 42 km altitude (-15 %/decade) and in spring (MAM) around 18 km (-6 %/ decade). Throughout the lower stratosphere (18 to 27 km) ozone depletion is around -3% per decade. Below 18 to 20 km altitude influences from the tropospheric circulation are the main contributors to ozone variance. Here long-term meteorological changes are very important for long term ozone changes. Significant QBO-related ozone fluctuations are found in the 43 to 28 km and 24 to 16 km altitude ranges (peak to peak amplitudes of 3 to 10%). A significant contribution, typically 2 to 3%, from the 11-year solar cycle occurs only between 20 and 26 km. If available at the time of the meeting, results for North-American and Japanese sta- tions will be presented and compared to those obtained for Hohenpeissenberg.- Publication:
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EGS General Assembly Conference Abstracts
- Pub Date:
- 2002
- Bibcode:
- 2002EGSGA..27..959S