Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 3 2009 10.5194/acpd-9-13093-2009 http://www.atmos-chem-phys-discuss.net/9/13093/2009/ http://www.atmos-chem-phys-discuss.net/9/13093/2009/acpd-9-13093-2009.html http://www.atmos-chem-phys-discuss.net/9/13093/2009/acpd-9-13093-2009.pdf 13093 13122 2009-06-11 Cold oceans enhance terrestrial new-particle formation in near-coastal forests T. Suni tanja.suni@helsinki.fi L. Sogacheva J. Lauros H. Hakola J. Bäck T. Kurtén H. Cleugh E. van Gorsel P. Briggs S. Sevanto M. Kulmala Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland Department of Forest Ecology, P.O. Box 27, 00014 University of Helsinki, Finland CSIRO Marine and Atmospheric Research, GPO Box 1666, Canberra ACT 2601, Australia The world's forests produce atmospheric aerosol by emitting volatile organic compounds (VOC) which, after being oxidized in the atmosphere, readily condense on the omnipresent nanometer-sized nuclei and grow them to climatically relevant sizes. The cooling effect of aerosols is the greatest uncertainty in current climate models and estimates of radiative forcing. Therefore, identifying the environmental factors influencing the biogenic formation of aerosols is crucial. We show that, in addition to local meteorological factors in the forest, the magnitude of evaporation from oceans hundreds of kilometers upwind can effectively suppress or enhance new-particle formation. 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