A 1996–1997 experiment that was one of the three main components forming the MAGE component of ACSOE. EAE was an extensive study of the speciation of sulphur and nitrogen in both clean and moderately polluted atmospheres, and involved the measurement of DMS and other gases in the ocean and the calculation of fluxes into the atmosphere, combined with the measurement of the speciation of sulphur and nitrogen in both gas and size–fractionated aerosol phases. The objectives were:

to quantify the input of DMS into a parcel of air;

to examine the oxidation of DMS and its reaction with nitrogen species with time;

to investigate the formation of new particles that result from these transformations; and

to discriminate between natural and anthropogenic fractions of sulphur and nitrogen using isotopic measurements.