ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-8553-2012 Model evaluation of marine primary organic aerosol emission schemes Gantt B. 1 Johnson M. S. 1 4 Meskhidze N. 1 Sciare J. 2 Ovadnevaite J. 3 Ceburnis D. 3 O'Dowd C. D. 3 North Carolina State University, Raleigh, NC, USA Laboratoire des Sciences du Climat et de l'Environnement, Gif-sur-Yvette, France School of Physics and Centre for Climate and Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland now at: NASA Ames Research Center, Moffett Field, CA, USA 21 09 2012 12 18 8553 8566 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/12/8553/2012/acp-12-8553-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/8553/2012/acp-12-8553-2012.pdf

In this study, several marine primary organic aerosol (POA) emission schemes have been evaluated using the GEOS-Chem chemical transport model in order to provide guidance for their implementation in air quality and climate models. These emission schemes, based on varying dependencies of chlorophyll <i>a</i> concentration ([chl <i>a</i>]) and 10 m wind speed (<i>U</i><sub>10</sub>), have large differences in their magnitude, spatial distribution, and seasonality. Model comparison with weekly and monthly mean values of the organic aerosol mass concentration at two coastal sites shows that the source function exclusively related to [chl <i>a</i>] does a better job replicating surface observations. Sensitivity simulations in which the negative <i>U</i><sub>10</sub> and positive [chl <i>a</i>] dependence of the organic mass fraction of sea spray aerosol are enhanced show improved prediction of the seasonality of the marine POA concentrations. A top-down estimate of submicron marine POA emissions based on the parameterization that compares best to the observed weekly and monthly mean values of marine organic aerosol surface concentrations has a global average emission rate of 6.3 Tg yr<sup>−1</sup>. Evaluation of existing marine POA source functions against a case study during which marine POA contributed the major fraction of submicron aerosol mass shows that none of the existing parameterizations are able to reproduce the hourly-averaged observations. Our calculations suggest that in order to capture episodic events and short-term variability in submicron marine POA concentration over the ocean, new source functions need to be developed that are grounded in the physical processes unique to the organic fraction of sea spray aerosol.

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