Unit 9 Causes and effects of air pollution Unit 9 Causes and effects of air pollution.
Effects of Global Change on Air Quality in the United States
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Transcript of Effects of Global Change on Air Quality in the United States
Effects of Global Change on Air Quality Effects of Global Change on Air Quality
in the United Statesin the United States
Shiliang Wu, Harvard 2nd GEOS-CHEM users’ meeting Apr 5, 2005
Look into the Future with GEOS-CHEM ---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?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 Meteorological control of air quality (case of 210210Pb)Pb)July mean surface concentration of 210Pb (fCi/SCM)
Air QualityPollutants
concentration & distribution
Chemistry, transport, deposition, etc
Frame structureFrame structure
Natural Emissions
Anthropogenic Emissions
Pollutants & precursors
GHG
Climate
Radiative forcing
Difference b/w GISS and GEOS – Vertical gridsDifference 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 gridsDifference b/w GISS and GEOS -- Horizontal grids
46 bins 45 bins
GEOS 4x5 GISS 4x5
GISS - “B” Grid GEOS - “A” Grid
( shift in both latitude and longitude direction )( shift in both latitude and longitude direction )
Difference b/w GISS and GEOS -- Convection SchemesDifference b/w GISS and GEOS -- Convection Schemes
GEOS_3 GEOS_4 GISS
Updraft UpdraftEntraining Updraft
Non-entraining Updraft
N/A DowndraftEntraining Downdraft
Non-entraining Downdraft
Detrainment EntrainmentEntraining Detrainment
Non-entraining Detrainment
Validation against ozonesonde dataValidation against ozonesonde data( July monthly mean )( July monthly mean )
ConclusionsConclusions
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.