Atmos. Chem. Phys. Discuss., 12, 14393-14445, 2012
www.atmos-chem-phys-discuss.net/12/14393/2012/
doi:10.5194/acpd-12-14393-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Ship impacts on the marine atmosphere: insights into the contribution of shipping emissions to the properties of marine aerosol and clouds
M. M. Coggon1, A. Sorooshian2,3, Z. Wang2, A. R. Metcalf4, A. A. Frossard5, J. J. Lin6, J. S. Craven1, A. Nenes6,7, H. H. Jonsson8, L. M. Russell5, R. C. Flagan1,4, and J. H. Seinfeld1,4
1Department of Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
2Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, USA
3Department of Atmospheric Sciences, University of Arizona, Tucson, AZ, USA
4Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, USA
5SCRIPPS Institution of Oceanography, University of California, San Diego, CA, USA
6School of Earth and Atmospheric Sciences, Georgia Inst. of Technology, Atlanta, GA, USA
7School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA
8Naval Postgraduate School, Monterey, CA, USA

Abstract. We report properties of marine aerosol and clouds measured in the shipping lanes between Monterey Bay and San Francisco off the coast of Central California. Using a suite of aerosol instrumentation onboard the CIRPAS Twin Otter aircraft, these measurements represent a unique set of data contrasting the properties of clean and ship-impacted marine air masses in dry aerosol and cloud droplet residuals. Average mass and number concentrations of below-cloud aerosol of 2 μg m−3 and 510 cm−3 are consistent with previous studies performed off the coast of California. Enhancement of vanadium and cloud droplet number concentration observed concurrently with a decrease in cloud water pH suggests that periods of high aerosol loading are primarily linked to increased ship influence. Mass spectra from a compact time-of-flight Aerodyne aerosol mass spectrometer reveal an enhancement in the fraction of organic at m/z 42 (f42) and 99 (f99) in ship-impacted clouds. These ions are well correlated to each other (R2 > 0.64) both in and out of cloud and dominate organic mass during periods of enhanced sulfate. High-resolution mass spectral analysis of these masses from ship measurements suggests that the ions responsible for this variation were oxidized, possibly due to cloud processing. We propose that the organic fractions of these ions be used as a metric for determining the extent to which ships impact the marine atmosphere where (f42 > 0.15; f99 > 0.04) would imply heavy influence from shipping emissions, (0.05 < f42 < 0.15; 0.01 < f99 < 0.04) would imply moderate, but persistent, influences from ships, and (f42 < 0.05; f99 < 0.01) would imply clean, non-ship-influenced air.

Citation: Coggon, M. M., Sorooshian, A., Wang, Z., Metcalf, A. R., Frossard, A. A., Lin, J. J., Craven, J. S., Nenes, A., Jonsson, H. H., Russell, L. M., Flagan, R. C., and Seinfeld, J. H.: Ship impacts on the marine atmosphere: insights into the contribution of shipping emissions to the properties of marine aerosol and clouds, Atmos. Chem. Phys. Discuss., 12, 14393-14445, doi:10.5194/acpd-12-14393-2012, 2012.
 
Search ACPD
Discussion Paper
    XML
    Citation
    Final Revised Paper
    Share