ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-8847-2011 Investigating organic aerosol loading in the remote marine environment Lapina K. 1 Heald C. L. 1 Spracklen D. V. 2 Arnold S. R. 2 Allan J. D. 3 Coe H. 3 McFiggans G. 3 Zorn S. R. 4 10 Drewnick F. 4 Bates T. S. 5 Hawkins L. N. 6 Russell L. M. 6 Smirnov A. 7 O'Dowd C. D. 8 Hind A. J. 9 Dept. of Atmospheric Science, Colorado State University, Fort Collins, CO, USA University of Leeds, Leeds, UK The University of Manchester, Manchester, UK Max Planck Institute for Chemistry, Mainz, Germany Pacific Marine Environmental Laboratory, NOAA, Seattle, WA, USA Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA, USA NASA/Goddard Space Flight Center, Greenbelt, MD, USA School of Physics and Centre for Climate and Air Pollution Studies, National University of Ireland Galway, Galway, Ireland Bigelow Laboratory for Ocean Sciences, West Boothbay Harbor, ME, USA now at: Harvard University, Cambridge, MA, USA 01 09 2011 11 17 8847 8860 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/11/8847/2011/acp-11-8847-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/8847/2011/acp-11-8847-2011.pdf

Aerosol loading in the marine environment is investigated using aerosol composition measurements from several research ship campaigns (ICEALOT, MAP, RHaMBLe, VOCALS and OOMPH), observations of total AOD column from satellite (MODIS) and ship-based instruments (Maritime Aerosol Network, MAN), and a global chemical transport model (GEOS-Chem). This work represents the most comprehensive evaluation of oceanic OM emission inventories to date, by employing aerosol composition measurements obtained from campaigns with wide spatial and temporal coverage. The model underestimates AOD over the remote ocean on average by 0.02 (21 %), compared to satellite observations, but provides an unbiased simulation of ground-based Maritime Aerosol Network (MAN) observations. Comparison with cruise data demonstrates that the GEOS-Chem simulation of marine sulfate, with the mean observed values ranging between 0.22 μg m<sup>−3</sup> and 1.34 μg m<sup>−3</sup>, is generally unbiased, however surface organic matter (OM) concentrations, with the mean observed concentrations between 0.07 μg m<sup>−3</sup> and 0.77 μg m<sup>−3</sup>, are underestimated by a factor of 2–5 for the standard model run. Addition of a sub-micron marine OM source of approximately 9 TgC yr<sup>−1</sup> brings the model into agreement with the ship-based measurements, however this additional OM source does not explain the model underestimate of marine AOD. The model underestimate of marine AOD is therefore likely the result of a combination of satellite retrieval bias and a missing marine aerosol source (which exhibits a different spatial pattern than existing aerosol in the model).

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