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4 th GEOS-Chem Users’ Meeting

4 th GEOS-Chem Users’ Meeting. Aerosol Optical Thickness. Cloud Fraction and Liquid Water Path. Kaufman et al., Nature, 2002. Bennartz , JGR, 2006. Effect of Oceanic Organic Carbon Emissions on the Growth of Secondary Particles and Global CCN Abundance. Gan Luo and Fangqun Yu

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4 th GEOS-Chem Users’ Meeting

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  1. 4th GEOS-Chem Users’ Meeting Aerosol Optical Thickness Cloud Fraction and Liquid Water Path Kaufman et al., Nature, 2002 Bennartz, JGR, 2006 Effect of Oceanic Organic Carbon Emissions on the Growth of Secondary Particles and Global CCN Abundance Gan Luo and Fangqun Yu ASRC, SUNY-Albany, 2009-04-07

  2. Introduction Observed α-pinene and isoprene over Southern Ocean - Yassaa et al., Environ. Chem., 2008 SOA, formed from the oxidation of phytoplankton-produced isoprene, can affect chemical composition of marine CCN - Meskhidze and Nenes, Science, 2006 Large uncertainty of marine organic carbon emission Marine organic aerosol: 8TgC/yr(Spracklen et al., GRL, 2008) Marine organic aerosol: 75TgC/yr(Roelofs, ACP, 2008) Primary OC: 35~50TgC/yr; SOA produced by isoprene: 25~40 TgC/yr Marine isoprene: in-situ 0.19TgC/yr (Broadgate et al, GRL, 1997); satellite 0.1TgC/yr(Palmer and Shaw, GRL, 2005); model 0.3~1.9TgC/yr(Arnold et al, ACP, 2009)

  3. GEOS-Chem Marine emission of α-pinene and isoprene : The emission scheme is based on chlorophyll concentration and 10 m wind speed C is Chlorophyll from combined MODIS/SeaWiFS Meteorology: GEOS-5, 4º×5º, 47 Layers Emission: EDGAR+EPA/LNEI99+BRAVO+EMEP+STREETS+GFED2 Chemistry: photochemistry + online aerosol chemistry Aerosol microphysics: Advanced Particle Microphysics

  4. Compare with Ship Measurement Yassaa et al., Environ. Chem., 2008 Shipboard measurements: 1-20-2007 ~ 2-5-2007 OOMPH (Organics over the Ocean Modifying Particles in both Hemispheres) summer cruise in the Southern Ocean GEOS-Chem simulated daily average ofα-pinene and isoprene along the shipping route during the same period Model simulation can capture the major variation of the two species

  5. Global Distributions at Surface 127TgC/Yr 602TgC/Yr 127+35TgC/Yr 602+2.1TgC/Yr

  6. Impact on Organic Chemistry Relative change Zonal average

  7. Impact on Sulfur Chemistry Relative change Zonal average

  8. Impact on CCN Abundance Relative change Zonal average

  9. Summary • Marine α-pinene and isoprene emissions and the impacts on chemistry and aerosols have been simulated withGEOS-Chem • Marine emission: α-pinene: 35TgC/yr, isoprene: 2.1TgC/yr • Marine α-pinene emission can increase SOA mass by up to 60% in the lower troposphere of Southern Hemisphere (40ºS-90ºS). It decreases OH concentration in the region by 1~10%. The associated changes in SO2 and H2SO4 concentrations result in an increase of nucleation rate over Antarctica by up to 10%, and total CCN over Antarctica enhanced by 3~5% • The impact of marine isoprene emission is small

  10. The End Thank You! Acknowledgments: Funding support from NASA, NOAA, and NSF

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