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Atmospheric Composition, Climate Variability & Change

We propose a four-year investigation of the aerosol composition and mixing state distribution in the GEOS Chemistry-Climate Model (GEOS CCM), including its impact on atmospheric heating and chemistry. Under previous MAP funding we implemented a mass based aerosol module (GOCART) and a sectional aerosol microphysics model (CARMA) in the GEOS-5 atmospheric general circulation model (a component of the GEOS CCM). In this proposal we will improve our understanding of the composition, microphysics, and radiative properties of atmospheric aerosols in simulations of the aerosols in the polluted regions in India and southeast Asia, where the so-called atmospheric brown clouds strongly impact regional dynamics and air quality. We will additionally investigate the interaction of aerosols and tropospheric chemistry. Our approach will be to: - introduce an online core-shell radiation code for calculation of the optical properties of internally mixed aerosols - develop offline lookup tables of aerosol optical properties for non-spherical, inhomogeneous aerosols - constrain simulated aerosol composition and optical properties with regional datasets - investigate the impact of improved treatment of aerosol composition and optics on atmospheric heating rates and chemical photolysis rates - investigate the interaction of running online aerosols and chemistry together We will initially focus on present-day (1999 - 2010) conditions with driven by the Modern-Era Retrospective-analysis for Research and Applications (MERRA) reanalysis data. Our objective is to realistically simulate aerosol distributions and composition as determined by comparisons to satellite (e.g., OMI, MODIS, MISR, CALIPSO) sensors and ground-based (e.g., AERONET) observations, in particular leveraging on our involvement in the ongoing TIGERZ campaign. With our model constrained by the previous experiments, we will perform climate simulations of present-day and mid-century (2041 - 2050) aerosol distributions and composition. Our objective is to deconvolve the impact of aerosol composition on regional climate from the impacts of changes in tropospheric chemistry, sea surface temperatures, and greenhouse gas concentrations.

Project PI: Peter Colarco/NASA Goddard Space Flight Center

Phone: 301.614.6382

Fax: 301.614.5903

Email: peter.r.colarco@nasa.gov

http://acdb-ext.gsfc.nasa.gov/People/Colarco

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Started: Aug 10, 2010

Last Activity: Mar 17, 2011

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