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Current and Future Aerosol Studies Using WRF-Chem at the National Center for Atmospheric Research

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Current and Future Aerosol Studies Using WRF-Chem at the National Center for Atmospheric Research

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    1. Current and Future Aerosol Studies Using WRF-Chem at the National Center for Atmospheric Research Mary Barth NCAR Contributions to the work presented: Alma Hodzic, Christine Wiedinmyer, Serena Chung (WSU), Jerome Fast (PNNL)

    2. Weather Research and Forecasting Model coupled with Chemistry (WRF-Chem)

    3. Topic 1: Initial studies of SOA chemistry with the CBMZ MOSAIC configuration

    4. Topic 2: Interactions between aerosols, radiation, and biogenic emissions

    5. Initial studies of SOA chemistry with the CBMZ MOSAIC configuration Work done by Alma Hodzic (NCAR) in collaboration with Jerome Fast (PNNL), Rahul Zaveri (PNNL) as part of Megacities Impact on Regional and Global Environment study (MIRAGE Mex)

    10. Whole idea is to add these 2 reactions w/o interfering with the O3 chemistryWhole idea is to add these 2 reactions w/o interfering with the O3 chemistry

    12. Before SOA module get equilibrium with inorganic species to get water content and pH information for SOA module. (MOSAIC approach; Zaveri et al., 2007) Aqueous aerosols Equilibrium with organic species Organic aerosols Equilibrium with organic species

    13. MPMPO and AER call both Henrys law and Raoults law. Should call one or the other part of setting up a modular method to use different approaches.MPMPO and AER call both Henrys law and Raoults law. Should call one or the other part of setting up a modular method to use different approaches.

    16. Initial studies of SOA chemistry with the CBMZ MOSAIC configuration Established a framework for studying SOA formation with the CBMZ MOSAIC configuration of WRF-Chem and in future with MADE/SORGAM The SOA chemistry and thermodynamics could be a good application for the Aerosol Testbed Future: Biogenic precursors + surrogate products Other long chain alkanes + OH ? should be included Implementing Robinson et al. (2007) partitioning POA that subsequently form SOA Allows for investigations of interactions between emissions, SOA, clouds and radiation

    17. Topic 2: Interactions between aerosols, radiation, and biogenic emissions

    18. Implementation of MEGAN and the Influence of Aerosols on Biogenic Emissions Christine Wiedinmyer, Serena Chung, Tanarit Sakulyanontvittaya, Alex Guenther, Jerome Fast, and Jana Milford MEGAN = Model of Emissions of Gases and Aerosols from Nature ? Emissions are determined from meteorological conditions

    20. Influence of Aerosols on Biogenic Emissions Wiedinmyer (NCAR), Chung (WSU), Sakulyanontvittaya (U.Colorado), Guenther (NCAR), Fast (DOE/PNNL), and Milford (U.Colorado) Meteorology modeling WRF-chem CBMZ chemical mechanism with the MOSAIC aerosol module Model domain: eastern U.S. at a 27 km x 27 km horizontal resolution July 2004 (ICARTT field campaign) 3-day simulation; results from 23 July 2004 are presented here.

    21. Influence of Aerosols on Biogenic Emissions Wiedinmyer (NCAR), Chung (WSU), Sakulyanontvittaya (U.Colorado), Guenther (NCAR), Fast (DOE/PNNL), and Milford (U.Colorado) Biogenic emissions modeling Model of Emissions of Gases and Aerosols from Nature (MEGAN; Guenther et al. 2006) used to predict emissions of biogenic volatile organic compounds (BVOCs) Model was run offline from WRF-chem ? no soil moisture effect Emission factor maps for monoterpenes and isoprene (Guenther et al. 2006) and Leaf area index (LAI) processed from 2003 MODIS observations MEGAN was run with a simple canopy (Eastern U.S. only).

    22. Two model simulations: 1) aerosols affect radiation which then affects biogenic emissions 2) aerosols do not affect radiation

    23. Results: Aerosol Distribution

    24. Results: Influence of Aerosols on Biogenic Emissions

    25. Results: Influence of Aerosols on Biogenic Emissions

    26. Results: Influence of Aerosols on Biogenic Emissions

    27. Results: Influence of Aerosols on Biogenic Emissions

    28. Evidence for interactions: Aerosols ? temperature and radiation ? biogenic emissions Next: Implement sesquiterpene emissions using MEGAN into WRF-Chem

    29. Pursue aerosol-cloud interaction studies Dust effects on ice nucleation Aqueous phase production of organic aerosols Future Plans: Aerosol-Cloud Interactions

    30. Pursue aerosol-cloud interaction studies Dust effects on ice nucleation Aqueous phase production of organic aerosols Aerosol effects on droplet activation in a 2-moment cloud microphysics scheme Aerosol effects on thunderstorms do emissions play a role? Does lightning activity become affected? Do thunderstorms affect biogenic emissions? Future Plans: Aerosol-Cloud Interactions

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