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GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY

GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY. Assimilated NASA/DAO meteorological observations for 1988-2001 1 o x1 o to 4 o x5 o horizontal resolution, 20-48 vertical layers Applied to simulations of O 3 , aerosols, precursors, other species in different regions of the world

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GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY

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  1. GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY • Assimilated NASA/DAO meteorological observations for 1988-2001 • 1ox1o to 4ox5o horizontal resolution, 20-48 vertical layers • Applied to simulations of O3, aerosols, precursors, other species in different regions of the world • 120 chemical species to describe tropospheric O3-NOx-hydrocarbon chemistry; aerosol effects on chemistry, radiation

  2. MODEL ANALYSIS OF TRANSATLANTIC TRANSPORT OF OZONE AND PRECURSORS: 1993-1997[Li et al., 2001]

  3. Sable Island, September Keflavik, August Bermuda, April MODEL EVALUATION WITH 1997 OZONESONDES observations model

  4. MODEL EVALUATION WITH NARE 1997 AIRCRAFT DATA (NORTHWEST ATLANTIC) O3 NOy NO CO Sep.13: clean day Sep.16: U.S. outflow observations model

  5. MODEL EVALUATION WITH ACSOE 1997AIRCRAFT DATA (NORTHEAST ATLANTIC) O3 CO Clean day European outflow day

  6. ORIGIN OF OZONE AT BERMUDA IN SPRING:production over U.S. is dominant source

  7. European influence on N. America N.American influence on Europe ENHANCEMENTS OF SURFACE OZONE IN NORTH AMERICA AND EUROPE DUE TO ANTHROPOGENIC EMISSIONS IN THE OTHER CONTINENT GEOS-CHEM model results, July 1997

  8. FUTURE RESEARCH NEEDS BETTER COUPLING OF 3-D MODELS AND OBSERVATIONS SATELLITE OBSERVATIONS Global and continuous but few species, low resolution Source/sink inventories 3-D CHEMICAL TRANSPORT MODELS SURFACE OBSERVATIONS high resolution but spatially limited Assimilated meteorological data AIRCRAFT OBSERVATIONS High resolution, targeted flights provide critical snapshots for model testing Chemical and aerosol processes INTERCONTINENTAL TRANSPORT OF POLLUTION

  9. TROPOSPHERIC NO2 FROM GOME (July 1996):mapping of NOx emissions [Martin et al., 2001] Scattering AMF using local shape factors from the GEOS-CHEM model and accounting for local cloud information (fraction, top, optical depth) GEOS-CHEM global 3-D model with GEIA inventory for NOx (scaled to 1996)

  10. FORMALDEHYDE COLUMNS FROM GOME (July 1996):mapping of isoprene emissions [Palmer et al., 2001]

  11. MOPITT observations of CO MOPITT validation during TRACE-P: 40N, 132W 0226 at 2005Z; double spiral bracketing in time the MOPITT overpass. Solid stratus deck with tops at 3.5Kft, otherwise clear sky. Layer at 4-7 km is aged Asian pollution. DC-8 CO data (Sachse)

  12. CONVERGENCE OF SCALES FOR AIR QUALITY AND CLIMATE RESEARCH urban regional continental intercontinental global AIR QUALITY RESEARCH CLIMATE RESEARCH Let’s take advantage of synergistic opportunities!

  13. INTERCONTINENTAL TRANSPORT EXPERIMENT – NORTH AMERICA (INTEX-NA)NASA/GTE two-aircraft mission for summer 2004based in Maine, California, Wisconsin OBJECTIVES: • Quantify the export of radiatively and chemically important trace gases and aerosols from North America • Relate these exports to surface sources and sinks and to continental boundary layer chemistry • Coordinated with • North American Carbon Cycle (NACC) • NOAA regional pollution study in New England • European research programs (transatlantic transport)

  14. INTEX MISSION DESIGN Satellite data for gases/aerosols (near real-time) DC-8 DC-8 Inflow Outflow P-3 Emissions/ Deposition Surface sites PACIFIC ATLANTIC NORTH AMERICA 3-D chemical models: forecasts/analyses

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