TRANSPORT AND PROCESSING OF O-3 AND O-3 PRECURSORS OVER THE NORTH-ATLANTIC - AN OVERVIEW OF THE 1993 NORTH-ATLANTIC REGIONAL EXPERIMENT (NARE) SUMMER INTENSIVE

In the summer of 1993, airborne and ground-based measurements of O-3 a nd O-3 precursors were made in the North Atlantic region. These studie s were made by an international team of scientists collaborating as pa rt of the North Atlantic Regional Experiment, an activity of the Inter national Global Atmospheric Chemistry project of the International Geo sphere-Biosphere Program, Previous measurements [cf. Fehsenfeld et al. , this issue] have indicated that the amount of O-3 produced from anth ropogenic sources is greater than that reaching the lower troposphere in this region from the stratosphere and that ozone derived from anthr opogenic pollution has a hemisphere wide effect at northern temperate latitudes. In this special issue the recently acquired data are used t o better quantify the contribution of continental sources to the ozone levels over the North Atlantic. The aim of this overview is to provid e the operational and logistical context of the study and to introduce the principal findings and conclusions that have been drawn from the results.