HR: 1340h
AN: A53A-0915    [Abstracts]
TI: Global Sea Salt Modeling Using a Coupled Microphysical and Climate Model and Its Comparison with Observations
AU: * Fan, T
EM: tfan@colorado.edu
AF: Laboratory for Atmospheric and Space Physics, University of Colorado, Campus Box 392, Boulder, CO 80302, United States
AU: Toon, O B
AF: Laboratory for Atmospheric and Space Physics, University of Colorado, Campus Box 392, Boulder, CO 80302, United States
AB: The indirect effect of anthropogenic aerosols on climate change is modulated by the abundance of natural aerosols. We model the global loading and size-distribution of sea salt aerosol (SSA) using a coupled microphysical/climate model based on the NCAR community atmospheric model (CAM) and the University of Colorado / NASA Community Aerosol and Radiation Model for Atmospheres (CARMA). Production, transport, vertical diffusion, particle growth and removal processes are represented in the model. Sea salt particles with 80% relative humidity radius ranging from 0.01 to greater than 50um are generated using a combined sea salt source function based on Andreas [1998], Gong [2003] and Martensson [2003]. The friction wind speed under different stability conditions is utilized to drive the production of SSA. Particle dry deposition and wet deposition are calculated on a size-resolved basis. The mass prediction is compared with sea salt mass data from a network of coastal sites that monitored aerosol composition [Savoie and Prospero, 1977] and INDOEX, ACE-Asia and NEAQS shipboard observations. The optical properties of size-resolved SSA are also compared with MODIS/MISR satellite data and AERONET sun photometer data at remote oceanic sites.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 3339 Ocean/atmosphere interactions (0312, 4504)
DE: 4801 Aerosols (0305, 4906)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting