SATELLITE OBSERVATIONS OF OZONE PRECURSORS FROM GOME
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SATELLITE OBSERVATIONS OF OZONE SATELLITE OBSERVATIONS OF OZONE PRECURSORS FROM GOMEPRECURSORS FROM GOME
Randall Martin, Daniel Jacob,Paul Palmer, Qinbin Li
Harvard University Kelly Chance, Thomas Kurosu
Harvard-Smithsonian Center for Astrophysics
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SURFACE OZONE ENHANCEMENTS CAUSED BY SURFACE OZONE ENHANCEMENTS CAUSED BY ANTHROPOGENIC EMISSIONS FROM DIFFERENT CONTINENTS ANTHROPOGENIC EMISSIONS FROM DIFFERENT CONTINENTS
GEOS-CHEM model July 1997
North America
Europe
Asia
Li et al. [2002]
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THE GOME SATELLITE INSTRUMENTTHE GOME SATELLITE INSTRUMENT
•Launched in April 1995
•Nadir-viewing solar backscatter instrument (237-794 nm)
• Low-elevation polar sun-synchronous orbit, 10:30 a.m. observation time
• Field of view 320x40 km2, three cross-track scenes
• Complete global coverage in 3 days
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USE GOME MEASUREMENTS OF NOUSE GOME MEASUREMENTS OF NO22 AND HCHO COLUMNS AND HCHO COLUMNS
TO MAP NOTO MAP NOx x AND VOC EMISSIONSAND VOC EMISSIONS
Emission
NO NO2
HNO3
lifetime <1 day
NITROGEN OXIDES (NOx) VOLATILE ORGANIC CARBON (VOC)
Emission
VOC
OHHCHO hours
CO
hours
BOUNDARYLAYER
GOME
NO/NO2
W ALTITUDE
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RETRIEVAL OF TROPOSPHERIC NORETRIEVAL OF TROPOSPHERIC NO2 2 FROM GOME FROM GOME (errors (errors in 10in 101515 molecules cm molecules cm-2-2))
GOME SPECTRUM (423-451 nm)
SLANT NO2 COLUMN
TROPOSPHERIC SLANT NO2 COLUMN
TROPOSPHERIC NO2 COLUMN
Fit spectrum
Remove stratospheric contribution, diffuser plate artifact
Use Central Pacific GOME data with:•HALOE to test strat zonal invariance•PEM-Tropics, GEOS-CHEM 3-D model to treat tropospheric residual
Apply AMF to convert slant column to vertical column
Use radiative transfer model with:•local surface albedos from GOME •local vertical shape factors from GEOS-CHEM• local cloud info from GOMECAT
O3, O4, H2O, Ring
Quantitative retrieval for partly cloudy scenes
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CAN WE USE GOME TO ESTIMATE NOCAN WE USE GOME TO ESTIMATE NOx x EMISSIONS?EMISSIONS?TEST IN U.S. WHERE GOOD TEST IN U.S. WHERE GOOD A PRIORI A PRIORI EXISTS EXISTS
Comparison of GOME retrieval (July 1996) to GEOS-CHEM model fieldsusing EPA emission inventory for NOx
GOME
GEOS-CHEM(EPA emissions) NO/NO2
WITH ALTITUDE
NOx lifetime <1day
BIAS = +18%r = 0.78
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GOME RETRIEVAL OF TROPOSPHERIC NOGOME RETRIEVAL OF TROPOSPHERIC NO22
vs. GEOS-CHEM SIMULATION (July 1996)vs. GEOS-CHEM SIMULATION (July 1996)
GEIA & Loganemissionsscaled to 1996
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[1016molec cm-2]
GEOS-CHEM GOME
ISOPRENE MAIN SOURCE OF HCHO IN U.S. IN SUMMERISOPRENE MAIN SOURCE OF HCHO IN U.S. IN SUMMER HCHO columns – July 1996HCHO columns – July 1996
r2 = 0.7
Bias = 11%
Model:Observed HCHO columns
GEIA isoprene emissions
[1012 atoms C cm-2 s-1]
Palmer et al.
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GEOS-CHEM RELATIONSHIP BETWEEN HCHO COLUMNS GEOS-CHEM RELATIONSHIP BETWEEN HCHO COLUMNS AND ISOPRENE EMISSIONS IN N AMERICAAND ISOPRENE EMISSIONS IN N AMERICA
Use relationship to map isoprene emissions from GOME observationsUse relationship to map isoprene emissions from GOME observations
Palmer et al. [2002]
GEOS-CHEMJuly 1996
NW NE
SESW
Isoprene emission [1013 atomC cm-2 s-1]
model without isoprene
Mod
el H
CH
O c
olu
mn
[101
6 m
ole
c c
m-2
]
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ISOPRENE EMISSIONS FOR ISOPRENE EMISSIONS FOR JULY 1996 DETERMINED BY JULY 1996 DETERMINED BY SCALING OF GOME SCALING OF GOME FORMALDEHYDE COLUMNS FORMALDEHYDE COLUMNS [Palmer et al., 2002][Palmer et al., 2002]
GOME
CONSISTENT WITH IN-SITU HCHO OBSERVATIONSGEIA
r2 = 0.53
Bias -3%
GOMEr2 = 0.77
Bias -12%
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GOME TROPOSPHERIC SLANT COLUMNS GOME TROPOSPHERIC SLANT COLUMNS DURING TRACE-P (3/15 - 4/15, 2001)DURING TRACE-P (3/15 - 4/15, 2001)
NO2 HCHO
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NEXT STEP: COUPLED CHEMISTRY-AEROSOL MODELNEXT STEP: COUPLED CHEMISTRY-AEROSOL MODELRadiative and chemical (uptake HORadiative and chemical (uptake HO22, NO, NO22, NO, NO33) effects of ) effects of
aerosols (SOaerosols (SO44, BC, OC, Dust, Sea-Salt) , BC, OC, Dust, Sea-Salt)
Off-line aerosol fields from Ginoux et al. [2001] and Chin et al. [2002]
GEOS-CHEM March OH
O3
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AEROSOLS REDUCE SURFACE OAEROSOLS REDUCE SURFACE O33 AND OH AND OH
GEOS-CHEM August OH
O3
Off-line aerosol fields from Ginoux et al. [2001] and Chin et al. [2002]
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CONCLUSIONSCONCLUSIONS
OH and O3 from Aerosols
Isoprene from GOME
NOx from GOME
Intercontinental O3 transport