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Atmospheric Composition, Weather

Deep convection affects atmospheric chemistry in many ways. Two of the most important effects are transport of boundary layer trace gases and aerosols to the upper troposphere and the wet removal of soluble species. Convective transport of ozone and HOx precursors leads to increased ozone production in the upper troposphere, which leads to increased radiative forcing and potential climate impacts. The subgrid processes of convective transport and wet scavenging are represented through parameterizations in the GEOS-5 Chemistry and Climate Model (CCM) and in the offline Global Modeling Initiative (GMI) chemical transport model (CTM). However, substantial uncertainty is associated with these parameterizations, as has been demonstrated in simulations performed for the time period of the Tropical Composition, Clouds, and Climate Coupling (TC4) experiment. We propose a detailed evaluation of the representation of these processes in the two models which will suggest ways in which the parameterizations can be improved. The following tasks will be performed: - Tracer transport and wet removal of soluble species will be simulated in individual convective events observed during recent and upcoming major field experiments (e.g., TC4, AMMA, SCOUT-O3/ACTIVE, TROCCINOX, DC3) using a cloud-resolving domain in the NASA Unified WRF model. - The resulting chemical fields from WRF will be evaluated using data observed by research aircraft in flight segments through the anvils of the storms of interest. - A single-column version of the GEOS-5 CCM will be run for the same convective events. - Tracer transport and wet removal in the single-column model will be evaluated using averaged fields from the WRF simulation. - Sensitivity studies will be conducted with the single-column model to determine the most appropriate improvements to the convection and wet scavenging schemes. - Full GEOS-5 CCM and offline GMI CTM simulations with the improved algorithms will be conducted. - Global model simulations will be evaluated against broader-scale aircraft data, sonde data, and satellite data from the Aura, Aqua, and Terra platforms. These simulations will be contrasted with those run with the standard convection and wet removal algorithms. - Simulations with improved process representation will be used to determine the global net effects of convection on upper tropospheric chemistry. The resulting improvements to representation of the convective transport and wet scavenging processes in the GEOS-5 CCM and the offline GMI CTM will lead to improved reliability in model simulations of tropospheric chemistry and in predictions of the interactions between chemistry and climate.

Project PI: Kenneth Pickering/NASA Goddard Space Flight Center

NASA Goddard Space Flight Center. Code 613.3. Greenbelt, MD 20771.

Phone: (301)614-5986

Fax: (301)614-5903

Email: kenneth.e.pickering @nasa.gov

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Started: Aug 10, 2010

Last Activity: Dec 15, 2010

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