Transport of ozone and sulfur to the North Atlantic atmosphere during the North Atlantic Regional Experiment

The horizontal transport of O-3, SO2, and non-sea-salt particulate SO4= over the ocean near Nova Scotia, Canada, is determined from in situ measurements made during the 1993 North Atlantic Regional Experiment (NARE) summer intensive. The average mass of O-3 transported through an area 1 m in horizontal extent and 5 lan in the vertical is 2.8 g s(-1), moving from west to east. Anthropogenic O-3 accounts for 50% of the transport below 1 km, 35-50% from 1 to 3 km, 25-50% from 3 to 4 km, and 10% from 4 to 5 lan. The average mass of SO2 and SO4= transported through the same area is 50 mg S s(-1), moving from west to east. Eighty percent of the SO4= and 55% of the SO2 are transported above 1 km, with little transport of these species seen above 3 km. The anthropogenic input of O-3 and S to the North Atlantic atmosphere from the North American continent is estimated.