Recent studies have demonstrated a link between ozone changes caused by human activities and changing UV levels at the Earth's surface, as well as a link to climate through changes in radiative forcing and links to changes in chemical composition.This book draws together key scientists who provide state of the art contributions on the variable ozone layer and the interplay of longwave and shortwave radiative interactions which link ozone, the climate and UV issues.

Developments in tropospheric chemistry.- 3-D tropospheric model development:Impact of non methane hydrocarbon chemistry.- Model analysis of stratosphere-troposphere exchange of ozone and its role in the tropospheric ozone budget.- Peroxy radicals concentration and ozone generation rate for different regions of Russia as a result of TROICA-2 experiment.- Overview of concepts and results of the PAUR I and PAUR II Projects (Modulation of Solar Ultraviolet Radiation and Photochemistry by Stratospheric Ozone, aerosols and tropospheric ozone).- Global impact of aircraft emission on ozone concentrations and methane lifetime: Results from the 1999 IPCC aircraft assessment.- The impact of NOx and H2O emissions from future Sub-and Supersonic aircraft upon the chemical composition of the atmosphere (A model study using a stratospheric CTM).- Calculations of radiative forcing from ozone change.- Atmospheric ozone as a climate gas: Studies concerning aircraft emissions.- Tropospheric aerosol formation: Processes observations and simulations.- Background levels of atmospheric particulate matter over the Northeast Atlantic ocean.- The effect of aerosol on UV flux at the Earth's surface.- A simplified spectral model for UV irradiance computations.- Observed long-term ozone and UV changes.- Variability of daily and annual cycles of mean erythemal solar irradiance related to total ozone variability.- UV irradiance patterns in Italy.- Calibration and characterization of erythemal broadband detectors.- Chemistry and radiation changes in the ozone layer [Halogenated hydrocarbons (halocarbons) and their impact on stratospheric ozone].- Springtime stratospheric ozone over Marambio, Antarctic during 1990-1998. (Analysis of ozone sonde data in relation the phase and position of polarvortex).- Stratospheric CLO across the edge of the Arctic polar vortex: Measurements of the Airborne-Submillimeter SIS Radiometer compared to 3-D model calculations.- Vertical profiles of long lived trace gases. (A basis for the analysis of stratospheric dynamics).- Study of the Arctic polar vortex erosion from ozone Lidar measurements performed at OHP (44N, 6E).- APE-GAIA Airborn Polar Experiment - Geophysica Aircraft in Antarctica.- Heterogeneous processes in the atmosphere.- Kinetics and mechanism of homogeneous reactions of halomethanes with chlorine atoms.- NASA's experience in deriving total ozone from satellites.- Satellite observations of tropospheric and stratospheric gases.- Monte Carlo simulations of radiative transfer for LIMB scan measurements.- Performances of the near real time code for MIPAS data analysis.- Aerosol retrieval algorithm for satellite solar occulation and infrared emission measurements: Theory and 3-D analysis.- An "intermediate" general circulation model for ozone change studies.- Numerical study of possible influence of longitudinal ozone inhomogeneities on dynamics of the middle atmosphere.- Investigation on different total ozone time scale components.- List of Lecturers.- List of Participants.