Articles | Volume 16, issue 19
Atmos. Chem. Phys., 16, 12425–12439, 2016

Special issue: BACCHUS – Impact of Biogenic versus Anthropogenic emissions...

Atmos. Chem. Phys., 16, 12425–12439, 2016

Research article 04 Oct 2016

Research article | 04 Oct 2016

Marine submicron aerosol gradients, sources and sinks

Darius Ceburnis1, Matteo Rinaldi2, Jurgita Ovadnevaite1, Giovanni Martucci1, Lara Giulianelli2, and Colin D. O'Dowd1 Darius Ceburnis et al.
  • 1School of Physics and Centre for Climate & Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland
  • 2Institute of Atmospheric Sciences and Climate, National Research Council, Bologna, Italy

Abstract. Aerosol principal sources and sinks over eastern North Atlantic waters were studied through the deployment of an aerosol chemistry gradient sampling system. The chemical gradients of primary and secondary aerosol components – specifically, sea salt (SS), water-insoluble organic matter (WIOM), water-soluble organic matter (WSOM), nitrate, ammonium, oxalate, amines, methanesulfonic acid (MSA) and water-soluble organic nitrogen (WSON) – were examined in great detail. Sea salt fluxes were estimated by the boundary layer box model and ranged from 0.3 to 3.5 ng m−2 s−1 over the wind speed range of 5–12 m s−1 and compared well with the derived fluxes from existing sea salt source parameterisations. The observed seasonal pattern of sea salt gradients was mainly driven by wind stress in addition to the yet unquantified effect of marine OM modifying fractional contributions of SS and OM in sea spray. WIOM gradients were a complex combination of rising and waning biological activity, especially in the flux footprint area, and wind-driven primary sea spray production supporting the coupling of recently developed sea spray and marine OM parameterisations.

Final-revised paper