Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-16445-2008 http://www.atmos-chem-phys-discuss.net/8/16445/2008/ http://www.atmos-chem-phys-discuss.net/8/16445/2008/acpd-8-16445-2008.html http://www.atmos-chem-phys-discuss.net/8/16445/2008/acpd-8-16445-2008.pdf 16445 16471 2008-08-27 Evaluation of the global oceanic isoprene source and its impacts on marine organic carbon aerosol S. R. Arnold s.arnold@see.leeds.ac.uk D. V. Spracklen J. Williams N. Yassaa J. Sciare B. Bonsang V. Gros I. Peeken A. C. Lewis S. Alvain C. Moulin Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK Max Planck Institute for Chemistry, Mainz, Germany IPSL/LSCE, CEA Saclay, Gif-sur-Yvette, France Ifm GEOMAR, Kiel, Germany Department of Chemistry, University of York, York, UK We have combined the first satellite maps of the global distribution of phytoplankton functional type and new measurements of phytoplankton-specific isoprene productivities, with available remote marine isoprene observations and a global model, to evaluate our understanding of the marine isoprene source and its impacts on organic aerosol abundances. Using satellite products to scale up data on phytoplankton-specific isoprene productivity to the global oceans, we infer a mean "bottom-up" oceanic isoprene emission of 0.31±0.08 (1 σ) Tg/yr. By minimising the mean bias between the model and isoprene observations in the marine atmosphere remote from the continents, we produce a "top-down" oceanic isoprene source estimate of 1.9 Tg/yr. We suggest our reliance on limited atmospheric isoprene data, and limited knowledge of isoprene productivity across the broad range of phytoplankton communities in the oceans as contributors to this difference between the two estimates. Inclusion of secondary organic aerosol (SOA) production from oceanic isoprene in the model with a 2% yield produces small contributions (0.01–1.6%) to observed organic carbon (OC) aerosol mass at three remote marine sites in the Northern and Southern Hemispheres. In addition, we find the seasonal cycle of the isoprene SOA source is out of phase with the observed cycle in OC in the remote Southern Ocean. 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