Effects of Global Change on Air Quality in the United States Shiliang Wu, Harvard 2 nd GEOS-CHEM users’ meeting Apr 5, 2005 Look into the Future with GEOS-CHEM.

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Presentation transcript:

Effects of Global Change on Air Quality in the United States Shiliang Wu, Harvard 2 nd GEOS-CHEM users’ meeting Apr 5, 2005 Look into the Future with GEOS-CHEM ---

Global Change and Air Pollution (GCAP) A collaborative interdisciplinary project involves groups from Harvard, Caltech, NASA/GISS, DOE/ANL, U.Tenn. Harvard Team: Daniel Jacob, Loretta Mickley, Shiliang Wu Great thanks Bob Yantosca for supportive work!

What will influence the future air quality? CTM 1. Emission 2. Meteorology Winds Convective mass flux Strat-influx

Meteorological control of air quality (case of 210 Pb) July mean surface concentration of 210 Pb (fCi/SCM)

Air Quality Pollutants concentration & distribution Chemistry, transport, deposition, etc Frame structure Natural Emissions Anthropogenic Emissions Pollutants & precursors GHG Climate Radiative forcing

Difference b/w GISS and GEOS – Vertical grids GEOS_3: 48 layers GEOS_4: 55 layers GISS II’: 23 layers

Difference b/w GISS and GEOS -- Horizontal grids 46 bins 45 bins GEOS 4x5GISS 4x5 GISS - “B” GridGEOS - “A” Grid ( shift in both latitude and longitude direction )

Difference b/w GISS and GEOS -- Convection Schemes GEOS_3GEOS_4GISS Updraft Entraining Updraft Non-entraining Updraft N/ADowndraft Entraining Downdraft Non-entraining Downdraft DetrainmentEntrainment Entraining Detrainment Non-entraining Detrainment

Different met-fields  Different results expected

Natural emission sensitive to met-fields

Lightning emission sensitive to met-fields

Afternoon tracer conc. over U.S. (surface layer)

Afternoon tracer conc. over U.S. (zonal mean)

Validation against ozonesonde data ( July monthly mean )

Conclusions 1. The performance of the GCAP model looks good and should be capable of the mission. 2. There still might be (minor) improvements in the near future. 3. GEOS-CHEM is (to some extent) flexible and easy going.

Thank you!