ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-6555-2012 Global distribution and climate forcing of marine organic aerosol – Part 2: Effects on cloud properties and radiative forcing Gantt B. 1 Xu J. 1 2 Meskhidze N. 1 Zhang Y. 1 Nenes A. 3 4 Ghan S. J. 5 Liu X. 5 Easter R. 5 Zaveri R. 5 Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC, USA Chinese Research Academy of Environment Sciences, No. 8 Dayangfang, Beiyuan, Chaoyang District, Beijing 100012, China School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA Atmospheric Sciences & Global Change Division, Pacific Northwest National Laboratory, Richland, WA, USA 25 07 2012 12 14 6555 6563 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/12/6555/2012/acp-12-6555-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/6555/2012/acp-12-6555-2012.pdf

A series of simulations with the Community Atmosphere Model version 5 (CAM5) with a 7-mode Modal Aerosol Model were conducted to assess the changes in cloud microphysical properties and radiative forcing resulting from marine organic aerosols. Model simulations show that the anthropogenic aerosol indirect forcing (AIF) predicted by CAM5 is decreased in absolute magnitude by up to 0.09 W m<sup>−2</sup> (7%) when marine organic aerosols are included. Changes in the AIF from marine organic aerosols are associated with small global increases in low-level in-cloud droplet number concentration and liquid water path of 1.3 cm<sup>−3</sup> (1.5%) and 0.22 g m<sup>−2</sup> (0.5%), respectively. Areas especially sensitive to changes in cloud properties due to marine organic aerosol include the Southern Ocean, North Pacific Ocean, and North Atlantic Ocean, all of which are characterized by high marine organic emission rates. As climate models are particularly sensitive to the background aerosol concentration, this small but non-negligible change in the AIF due to marine organic aerosols provides a notable link for ocean-ecosystem marine low-level cloud interactions and may be a candidate for consideration in future earth system models.

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