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Utilizing GEOS-Chem for Satellite Observations of Tropospheric Gases and Emission Estimates

This study explores the application of the GEOS-Chem model by the Smithsonian Astrophysical Observatory and Dalhousie University in interpreting satellite observations of key tropospheric gases, including NO2, HCHO, O3, SO2, and BrO. Focused on optimizing the retrieval of slant and vertical columns, the research aims to identify biases in instrument data and emission estimates. Key findings include the determination of NOx emissions and seasonal variations, with advanced methodologies employed for accurate atmospheric modeling and data comparison, facilitating improved air quality assessment.

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Utilizing GEOS-Chem for Satellite Observations of Tropospheric Gases and Emission Estimates

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  1. USE OF GEOS-CHEM BY SMITHSONIAN ASTROPHYSICAL OBSERVATORY AND DALHOUSIE UNIVERSITY Randall Martin Mid-July Halifax, Nova Scotia SAO

  2. RETRIEVAL AND INTERPRETATION OF SATELLITE OBSERVATIONS OF THE TROPOSPHERE NO2, HCHO, O3, SO2, BrO

  3. GEOS-CHEM MODEL IDENTIFIES FAVORABLE REGIONS TO DETERMINE STRATOSPHERIC COLUMN AND INSTRUMENT BIASES Martin et al., 2002

  4. SLANT COLUMNS OF TROPOSPHERIC NO2 FROM GOME 1996 Martin et al., 2002

  5. USE GEOS-CHEM TO CALCULATE AMFs FOR NO2 and HCHO FOR EVERY SATELLITE VIEWING SCENE GEOS-CHEMGLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY: provides shape factors LIDORT RAD.TRANSFER MODEL: provides scattering weights AMF spectral fit SATELLITE DATA SLANT COLUMN VERTICAL COLUMN • Best information applied to each scene • Consistency in comparing model and observed columns ADVANTAGES OF 3-D MODEL APPROACH FOR COMPUTING AMFs

  6. OPTIMIZE INVENTORY USING A PRIORI BOTTOM-UP AND GOME TOP-DOWN INFORMATION Determine NOx Emissions from GOME Observations Using GEOS-CHEM to Provide Information on the NOx/NO2 Ratio and NOx Lifetime GOME Tropospheric NO2 GEOS-CHEM Tropospheric NO2 Martin et al., 2003 1015 molecules cm-2

  7. IN THE QUEUE: GEOS-CHEM NOX EMISSIONS WILL REFLECT ADDITIONAL GOME INFORMATION Annual mean ratio (A posteriori / A priori) Martin et al., 2003

  8. EXAMINE SEASONAL VOC EMISSIONS USING GOME AND GEOS-CHEM HCHO COLUMNS: SAO Role in Retrieval, AMFs, and Model Simulation JUL MAR AUG APR MAY SEP OCT JUN Abbot et al., 2003

  9. EL NINO INTERANNUAL VARIABILITY IN OZONE:DIFFERENCE BETWEEN OCT 97 AND OCT 96 TOMS Chandra et al. [2002]

  10. TOMS/MLS TROPOSPHERIC OZONE PROVIDES FURTHER EVIDENCE THAT OZONE IS TOO HIGH OVER INDIA 30 N Dobson Units for March, April, May TOMS/MLS 30 S 30 N GEOS-CHEM Chandra et al., 2003 30 S

  11. SUPPORT FOR GMI OPERATIONAL HCHO RETRIEVAL ALGORITHM FOR OMI Uses Monthly Mean HCHO Shape Factors from GEOS-CHEM • Provide GEOS-CHEM resultsfor various simulations (i.e. with and without aerosols) • Assist interpretation of model results EVALUATE GEOS-CHEM SIMULATION OF NOX With In Situ NO2 Measurements from SOS (1999) and TEXAQS (2000)

  12. FUTURE USE OF GEOS-CHEM AT DALHOUSIE Likely local platforms: 8-Processor 1.2 GHz Sun Fire 3800 (Works!, credit Yantosca) 20-Processor 700 MHz SGI Origin 350 Continued support for GMI Real-time HCHO and NO2 Retrievals from SCIAMACHY for INTEXUse Shape Factors from GEOS-CHEMRetrieval and Interpretation of HCHO, NO2, SO2, O3, BrO, CO from TOMS / GOME / SCIAMACHY / OMIInterpretation of satellite observations from MOPITT, MODIS, TES, … and aircraft missions such as INTEX, ITCT-2K4, …

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