References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-10-1287-2010

Contributions from DMS and ship emissions to CCN observed over the summertime North Pacific

Langley

¹ ⁶ Leaitch

W. R.

² Lohmann

³ Shantz

N. C.

⁴ ⁷ Worsnop

D. R.

⁵

Dalhousie University, Halifax, Nova Scotia, Canada

Environment Canada, Toronto, Ontario, Canada

Institute for Atmospheric and Climate Science, ETH Zurich, Switzerland

University of Toronto, Toronto, Ontario, Canada

Aerodyne Research Incorporated, Billerica, Massachusetts, USA

now at: Meteorological Service of Canada, Dartmouth, Nova Scotia, Canada

now at: Environment Canada, Toronto, Ontario, Canada

05 02 2010

10 3 1287 1314

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/10/1287/2010/acp-10-1287-2010.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/1287/2010/acp-10-1287-2010.pdf

Measurements of cloud condensation nuclei (CCN) made over the North Pacific Ocean in July 2002 are analysed with concurrent measurements of aerosol number, mass and composition. Overall the CCN are controlled by the sulphate, including one case that suggests particle nucleation and growth resulting from dimethyl sulphide oxidation that enhanced CCN concentrations. Hourly CCN concentrations are correlated with concentrations of sulphate plus methanesulphonic acid (MSA) over the entire study period (r2=0.43 and 0.52 for supersaturations of 0.34% and 0.19%, respectively), and are not well correlated with other organics (r2<0.2). One case study reveals elevated mass and number concentrations of ultrafine and fine organic particles due to regional ship emissions, identified through quadrupole aerosol mass spectrometer (Q-AMS) measurements, during which organic mass concentrations are correlated with CCN values (r2=0.39 and 0.46 for supersaturations of 0.19% and 0.34%, respectively). The evolution of the time series and mass distributions of organics, sulphate and MSA over this timeframe indicate that the regional distribution of small, diffuse ship-sourced organic particles act as condensation sites for sulphur species, resulting in a subsequent increase in number concentrations of CCN. We conclude that, where present, direct emissions of anthropogenic organic particles may exert a strong control on marine CCN concentrations once diffused into the marine atmosphere, by acting as condensation sites for biogenic and anthropogenic sulphur species.

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