This session is focussed on the synthesis of stratospheric processes in the context of climate interpretation and prediction. Issues concerning stratospheric climate and effects of stratospheric processes on the lower atmosphere are important aspects of the session. Both numerical modeling and diagnostic studies involving observations are included. Of special interest are the following themes that span different time scales: periodic, annual cycle; intraseasonal and interannual variations, including the QBO and longer time-scale variations; long-term trends and their causal analyses in terms of natural and anthropogenic influences.

Subsession 3-2: Internal Variations in S-T Coupled System

I. Hirota: Interannual variations of planetary waves in the Southern Hemisphere stratosphere (O/3-2.2)

J. Austin: Climate model simulations of past stratospheric ozone, temperature and water vapour trends (O/3-2.7)

Subsession 3-3: Responses to Forcings

K. Tourpali: Response of the MA-ECHAM/CHEM model to solar forcing: first results of a fully interactive model study (O/3-3.3)

Subsession 3-4: Trends

D. Karoly: Detection and attribution of a stratospheric role in climate change: an IPCC perspective (O/3-4.1)

Subsession 3-1: Climatology

3-1-1 GCMs

B. Theodore: The MSDOL project: Sequential assimilation of satellite measurements of stratospheric ozone in a 3D chemistry-dynamics-transport model (P/3-1.4)

3-1-2 Chemistry and Transport

E. Manzini: Residual circulation and transport in interactive chemistry-climate simulations (P/3-1.5)

H. Akiyoshi: Development of stratospheric chemical transport model based on CCSR/NIES AGCM (P/3-1.8)

T. Halenka: On the sensitivity of RegCM2 to ozone incorporation (P/3-1.11)

G. Koch: Dynamical causes for deviations of ozone profiles in Switzerland (P/3-1.12)

Subsession 3-2 Internal Variations in S-T Coupled System

3-2-1 Annular Modes

S. Zhou: A diagnostic study of stratospheric dynamical effects on the troposphere (P/3-2.1)

M. Sigmond: Analysis of stratosphere to surface level propagation of zonal wind variations during NH winter 1988-89 (P/3-2.3)

B. Christiansen: Model studies of the dynamical connection between the stratosphere and the troposphere (P/3-2.4)

H. Koernich: Interpretation of the Arctic oscillation in dependence on stationary wave forcing (P/3-2.6)

3-2-2 Other Intraseasonal and Interannual Variations

S. Yoden: A numerical experiment on intraseasonal and interannual variations of the troposphere-stratosphere coupled system (P/3-2.8)

K. Mohanakumar: Role of Asia Pacific Wave on stratosphere-troposphere exchange (P/3-2.12

M. Richman: On the use and abuse of eigentechniques for stratospheric analyses (P/3-2.14)

Subsession 3-3 Responses to Forcings

3-3-1 QBO and ENSO

Y. Naito: The QBO effects on the stratospheric and tropospheric circulation in the Southern Hemisphere (P/3-3.1)

E. Echer: QBO and solar cycle signals on total ozone at tropical Brazilian stations (P/3-3.3)

A. Gettelman: El-Nino as a natural experiment for understanding the Tropical Tropopause Region (P/3-3.4)

J. Fochesatto: South America ENSO teleconnection coherence patterns and their impacts to tropospheric parameters over Buenos Aires (P/3-3.5)

3-3-2 Solar Forcing

K. Shibata: Simulations of the effect of solar variability on the troposphere and middle atmosphere with MRI/JMA98 GCM (P/3-3.7)

M. Nakamoto: Solar cycle variability and stratospheric ozone (P/3-3.9)

K. Georgieva: Solar asymmetry, QBO and climate (P/3-3.11)

E. Rozanov: Sensitivity of the UIUC stratosphere/troposphere GCM with interactive photochemistry to the observed increase of solar UV radiation (P/3-3.12)

3-3-3 Volcanic Aerosols

E. Rozanov: Study of the effects of the Pinatubo volcanic eruption using the UIUC stratosphere/troposphere GCM with interactive photochemistry (P/3-3.13)

D. Chartrand: Perturbation and recovery of chemical species due to the Mount Pinatubo eruption as modelled by the Canadian Middle Atmospheric Model (P/3-3.16)

R. Estevan: Stratospheric aerosol new background conditions measured with lidar over Camaguey, Cuba (P/3-3.18)

M.A. Parodi: Neural network analysis of the Pinatubo effect on ozone at high latitudes of the Southern Hemisphere (P/3-3.19)

Subsession 3-4 Trends

3-4-1 Trend Studies

T. Egorova: Simulation of the effects of the Montreal Protocol using the UIUC stratosphere/troposphere ACTM driven by the UKMO-assimilated winds (P/3-4.3)

3-4-2 Climate Change Simulations

T. Hirooka: Interannual variations of the general circulation and polar stratospheric ozone losses in a general circulation model (P/3-4.10)

N. Butchart: Modeled changes in the stratospheric climate and Brewer-Dobson circulation due to increasing greenhouse-gas concentration (P/3-4.13)

J. de Grandpré: CO₂-Induced cooling and ozone feedback in the middle atmosphere (P/3-4.14)

C. Brühl: Feedback processes between chemistry and meteorology with focus on lower stratospheric polar vortices, simulations with a coupled GCM (P/3-4.16)