Atmospheric Chemistry Studies in the Oceanic Environment

Project Description
The Eastern Atlantic Experiment was a part of the Marine Aerosol and
Gas Exchange (MAGE) component of the Atmospheric Chemistry Studies in
the Oceanic Environment (ACSOE) project.

The aims of the experiment were:

To quantify 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 as a result of these
transformations

To discriminate between the natural and anthropogenic fractions ofA
research vessel operating off the west coast of Ireland (RRS
Challenger)

Research aircraft overflights to link shipborne and land-based measurements.

The primary measurements made during the campaigns were concentrations
of DMS in the atmosphere and the water column, but a wide range of
additional measurements were made including:

Atmospheric ozone and nitrogen species
Atmospheric particulates and their chemistry
Atmospheric nitrogen and sulphur isotopic composition
Oceanic temperature, salinity, attenuance and chlorophyll
Meteorology

The fieldwork was supported by modelling work with a zero-dimensional
time-dependent photochemical box model of an air mass in the marine
boundary layer.