Observationally constrained analysis of sea salt aerosol in the 1 marine atmosphere 2 3

Huisheng Bian1,2, Karl Froyd3,4, Daniel M. Murphy3, Jack Dibb5, Mian Chin2, Peter R. Colarco2, 4 Anton Darmenov2, Arlindo da Silva2, Tom L. Kucsera6, Gregory Schill3,4, Hongbin Yu2, Paul 5 Bui7, Maximilian Dollner8, Bernadett Weinzierl8, and Alexander Smirnov9 6 1 University of Maryland at Baltimore County, Baltimore County, MD 7 2 NASA Goddard Space Flight Center, Greenbelt, MD 8 3 NOAA Earth System Research Laboratory, Chemical Sciences Division, CO 9 4 Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 10 5 University of New Hampshire, Durham, NH 11 6 Universities Space Research Association, Columbia, MD 12 7 NASA Ames Research Center, Moffett Field, CA 13 14 8 University of Vienna, Faculty of Physics, Aerosol and Environmental Physics , Boltzmanngasse 5, A15 1090 Wien, Austria 16 17 9 Science Systems and Applications, Inc., Lanham, MD 20706 18 19 Abstract 20 Atmospheric sea salt plays important roles in marine cloud formation and atmospheric 21 chemistry. We performed an integrated analysis of NASA GEOS model simulations run 22 with the GOCART aerosol module, in situ measurements from the PALMS and SAGA 23 instruments obtained during the NASA ATom campaign, and aerosol optical depth 24 (AOD) measurements from AERONET Marine Aerosol Network (MAN) sun 25 photometers and from MODIS satellite observations to better constrain sea salt in the 26 marine atmosphere. ATom measurements and GEOS model simulation both show that 27