GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY

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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

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MODEL EVALUATION OF TRANSATLANTIC TRANSPORT OF
OZONE AND PRECURSORS 1993-1997Li et al., 2001
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MODEL EVALUATION WITH 1997 OZONESONDES
observations
model
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MODEL EVALUATION WITH NARE 1997 AIRCRAFT DATA
(NORTHWEST ATLANTIC)
O3
NOy
NO
CO
Sep.13 clean day
Sep.16 U.S. outflow day
observations
model
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MODEL EVALUATION WITH ACSOE 1997AIRCRAFT DATA
(NORTHEAST ATLANTIC)
O3
CO
Clean day
European outflow day
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ORIGIN OF OZONE AT BERMUDA IN SPRINGproduction
over U.S. is dominant source
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ENHANCEMENTS OF SURFACE OZONE IN NORTH AMERICA
AND EUROPE DUE TO ANTHROPOGENIC EMISSIONS IN THE
OTHER CONTINENT
GEOS-CHEM model results, July 1997
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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

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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)
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FORMALDEHYDE COLUMNS FROM GOME (July
1996)mapping of isoprene emissions Palmer et
al., 2001
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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)
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CONVERGENCE OF SCALES FOR AIR QUALITY AND
CLIMATE RESEARCH
urban regional continental intercontinental
global
AIR QUALITY RESEARCH
CLIMATE RESEARCH
Lets take advantage of synergistic opportunities!
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INTERCONTINENTAL TRANSPORT EXPERIMENT NORTH
AMERICA (INTEX-NA)NASA/GTE two-aircraft mission
for summer 2004based in Maine, Wisconsin,
California
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 New England pollution study
• European research programs

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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