use of geos-chem by smithsonian astrophysical observatory and dalhousie university
DESCRIPTION
USE OF GEOS-CHEM BY SMITHSONIAN ASTROPHYSICAL OBSERVATORY AND DALHOUSIE UNIVERSITY. Randall Martin. Mid-July. Halifax, Nova Scotia. SAO. RETRIEVAL AND INTERPRETATION OF SATELLITE OBSERVATIONS OF THE TROPOSPHERE. NO 2 , HCHO , O 3 , SO 2 , BrO. - PowerPoint PPT PresentationTRANSCRIPT
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USE OF GEOS-CHEM BY SMITHSONIAN ASTROPHYSICAL OBSERVATORY AND DALHOUSIE UNIVERSITY
Randall Martin
Mid-July
SAO
Halifax, Nova Scotia
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RETRIEVAL AND INTERPRETATION OF SATELLITE RETRIEVAL AND INTERPRETATION OF SATELLITE OBSERVATIONS OF THE TROPOSPHEREOBSERVATIONS OF THE TROPOSPHERE
Instrument Coverage Typical resolution
(km)
GOME 1995- 40x320
SCIAMACHY 2002- 30x60
OMI 2004- 13x24
NO2, HCHO, O3, SO2, BrO
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GEOS-CHEM MODEL IDENTIFIES FAVORABLE REGIONS TO DETERMINE STRATOSPHERIC COLUMN
AND INSTRUMENT BIASES
Martin et al., 2002
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SLANT COLUMNS OF TROPOSPHERIC NOSLANT COLUMNS OF TROPOSPHERIC NO22 FROM GOME FROM GOME
1996
Martin et al., 2002
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USE GEOS-CHEM TO CALCULATE AMFs FOR NOUSE GEOS-CHEM TO CALCULATE AMFs FOR NO22 and and
HCHO FOR EVERY SATELLITE VIEWING SCENEHCHO FOR EVERY SATELLITE VIEWING SCENE
SATELLITE DATA
SLANTCOLUMN
GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY:
provides shape factors
AMF
VERTICALCOLUMN
VERTICALCOLUMN
• Best information applied to each scene• Consistency in comparing model and observed columns
ADVANTAGES OF 3-D MODEL APPROACHFOR COMPUTING AMFs
spectralfit
LIDORT RAD.TRANSFER MODEL:
provides scattering weights
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GOME Tropospheric NO2 GEOS-CHEM Tropospheric NO2
1015 molecules cm-2
Martin et al., 2003Martin et al., 2003
OPTIMIZE INVENTORY USING OPTIMIZE INVENTORY USING A PRIORIA PRIORI BOTTOM-UP AND BOTTOM-UP AND GOME TOP-DOWN INFORMATIONGOME TOP-DOWN INFORMATION
Determine NOx Emissions from GOME Observations Using GEOS-CHEM to Provide Information on the NOx/NO2 Ratio and NOx Lifetime
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IN THE QUEUE: GEOS-CHEM NOIN THE QUEUE: GEOS-CHEM NOXX EMISSIONS WILL REFLECT EMISSIONS WILL REFLECT
ADDITIONAL GOME INFORMATIONADDITIONAL GOME INFORMATION
Annual mean ratio (A posteriori / A priori)
Martin et al., 2003Martin et al., 2003
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EXAMINE SEASONAL VOC EMISSIONS USING GOME AND GEOS-CHEM EXAMINE SEASONAL VOC EMISSIONS USING GOME AND GEOS-CHEM HCHO COLUMNS: HCHO COLUMNS: SAO Role in Retrieval, AMFs, and Model SimulationSAO Role in Retrieval, AMFs, and Model Simulation
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
Abbot et al., 2003Abbot et al., 2003
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EL NINO INTERANNUAL VARIABILITY IN OZONE:EL NINO INTERANNUAL VARIABILITY IN OZONE:DIFFERENCE BETWEEN OCT 97 AND OCT 96DIFFERENCE BETWEEN OCT 97 AND OCT 96
Chandra et al. [2002]
TOMS
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TOMS/MLS TROPOSPHERIC OZONE PROVIDES FURTHER TOMS/MLS TROPOSPHERIC OZONE PROVIDES FURTHER EVIDENCE THAT OZONE IS TOO HIGH OVER INDIAEVIDENCE THAT OZONE IS TOO HIGH OVER INDIA
Dobson Units for March, April, May
TOMS/MLS
GEOS-CHEM
30 N
30 S
30 N
30 SChandra et al., 2003Chandra et al., 2003
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OPERATIONAL HCHO RETRIEVAL ALGORITHM FOR OMIOPERATIONAL HCHO RETRIEVAL ALGORITHM FOR OMI
Uses Monthly Mean HCHO Shape Factors from GEOS-CHEMUses Monthly Mean HCHO Shape Factors from GEOS-CHEM
SUPPORT FOR GMISUPPORT FOR GMI
•Provide GEOS-CHEM resultsProvide GEOS-CHEM results for various simulations (i.e. with and without aerosols)
•Assist interpretation of model results
EVALUATE GEOS-CHEM SIMULATION OF NOEVALUATE GEOS-CHEM SIMULATION OF NOX X
With With In SituIn Situ NO NO22 Measurements from SOS (1999) and TEXAQS (2000) Measurements from SOS (1999) and TEXAQS (2000)
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FUTURE USE OF GEOS-CHEM AT DALHOUSIEFUTURE USE OF GEOS-CHEM AT DALHOUSIE
Likely local platforms: Likely local platforms:
8-Processor 1.2 GHz Sun Fire 3800 (Works!, credit Yantosca)8-Processor 1.2 GHz Sun Fire 3800 (Works!, credit Yantosca)
20-Processor 700 MHz SGI Origin 35020-Processor 700 MHz SGI Origin 350
Continued support for GMI Continued support for GMI
Real-time HCHO and NOReal-time HCHO and NO22 Retrievals from SCIAMACHY for INTEX Retrievals from SCIAMACHY for INTEX
Use Shape Factors from GEOS-CHEMUse Shape Factors from GEOS-CHEM
Retrieval and Interpretation of HCHO, NORetrieval and Interpretation of HCHO, NO22, SO, SO22, O, O33, BrO, CO from , BrO, CO from
TOMS / GOME / SCIAMACHY / OMITOMS / GOME / SCIAMACHY / OMI
Interpretation of satellite observations from MOPITT, MODIS, TES, … Interpretation of satellite observations from MOPITT, MODIS, TES, … and aircraft missions such as INTEX, ITCT-2K4, …and aircraft missions such as INTEX, ITCT-2K4, …