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GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY

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Assimilated NASA/DAO meteorological observations for 1988-2001. 1ox1o to 4ox5o horizontal resolution, 20-48 ... Sable Island, September. observations. model ... – PowerPoint PPT presentation

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Title: GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY


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 EVALUATION OF TRANSATLANTIC TRANSPORT OF
OZONE AND PRECURSORS 1993-1997Li et al., 2001
3
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 day
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 SPRINGproduction
over U.S. is dominant source
7
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
Lets take advantage of synergistic opportunities!
13
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

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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