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Lower Stratospheric Temperature Trends

Kay Shelton University of Reading, UK. Lower Stratospheric Temperature Trends. U ndergraduate Projec t presentation. Background. Why are we interested the lower stratosphere? Ozone depletion Contributory factors Self-perpetuating cycle of ozone destruction and temperature

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Lower Stratospheric Temperature Trends

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  1. Kay SheltonUniversity of Reading, UK Lower Stratospheric Temperature Trends Undergraduate Project presentation

  2. Background • Why are we interested the lower stratosphere? • Ozone depletion • Contributory factors • Self-perpetuating cycle of ozone destruction and temperature • Role of Polar Stratospheric Clouds (PSCs)

  3. Objectives • Quantitative result of trend in global temperature, and impact on climate • Comparison between Northern and Southern Hemispheres

  4. Methodology • MSU data • www.atmos.uah.edu/essc/msu • Monthly-mean temperature anomaly • Daily, zonal temperatures • Temperature integral

  5. Results I – Monthly-mean • Global cooling trend of 0.52 K /decade • NH and SH contribution to global trend • Volcanic eruptions

  6. Results II – Daily, zonal • Northern / Southern hemisphere comparison • Northern hemisphere variability and sudden stratospheric warmings • Magnitude of temperature anomaly • Temperature integral

  7. Results II (cont.) • Latitudinal variation in trend • Changing view of temperature trends

  8. Results II (cont.) • Uncertainty associated with using a fixed PSC threshold temperature • NH / SH comparison

  9. Results II (cont.)

  10. Uncertainties and Limitations • MSU senses over broad altitude band • Mean layer signal • Satellite drift • Tropical latitudes • Assumption of PSC formation • Significance of the trends

  11. Conclusions and Future Work • Global cooling trend • Cooling trend more severe in polar regions • Contrast between NH and SH • Comparison of trend results with those from other data sets (e.g. radiosonde) • Validation of PSC formation from observations • Remove effects of oscillations from trend • QBO, ENSO, Sun-spot cycle

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