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| Williams, J.; Custer, T.; Riede, H.; Sander, R.; Joeckel, P.; Hoor, P.; Pozzer, A.; Wong-zehnpfennig, S.; Beygi, Z. Hosaynali; Fischer, H.; Gros, V.; Colomb, A.; Bonsang, B.; Yassaa, N.; Peeken, I.; Atlas, E. L.; Waluda, C. M.; Van Aardenne, J. A.; Lelieveld, J.. |
| Ship-borne measurements have been made in air over the remote South Atlantic and Southern Oceans in January-March 2007. This cruise encountered a large-scale natural phytoplankton bloom emitting reactive hydrocarbons (e. g. isoprene); and a high seas squid fishing fleet emitting NOx (NO and NO2). Using an atmospheric chemistry box model constrained by in-situ measurements, it is shown that enhanced ozone production ensues from such juxtaposed marine biogenic and anthropogenic emissions. The relative impact of shipping and phytoplankton emissions on ozone was examined on a global scale using the EMAC model. Ozone in the marine boundary layer was found to be over ten times more sensitive to NOx emissions from ships, than to marine isoprene in the region... |
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| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00231/34260/32628.pdf |
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| Arnold, S. R.; Spracklen, D. V.; Williams, J.; Yassaa, N.; Sciare, J.; Bonsang, B.; Gros, V.; Peeken, I.; Lewis, A. C.; Alvain, S.; Moulin, C.. |
| 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 sigma) 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... |
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| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00218/32915/31411.pdf |
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