1 / 12

Chulkyu Lee , Aaron van Dokelaar, Gray O’Byrne: Dalhousie Univ.

Retrieval of SO 2 Vertical Columns from SCIAMACHY and OMI: Air Mass Factor Algorithm Development and Validation. Chulkyu Lee , Aaron van Dokelaar, Gray O’Byrne: Dalhousie Univ. Randall V. Martin: Dalhousie Univ. and Harvard-Smithsonian Nickolay Krotkov: NASA Goddard and UMBC

tallis
Download Presentation

Chulkyu Lee , Aaron van Dokelaar, Gray O’Byrne: Dalhousie Univ.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Retrieval of SO2 Vertical Columns from SCIAMACHY and OMI: Air Mass Factor Algorithm Development and Validation Chulkyu Lee, Aaron van Dokelaar, Gray O’Byrne: Dalhousie Univ. Randall V. Martin: Dalhousie Univ. and Harvard-Smithsonian Nickolay Krotkov: NASA Goddard and UMBC Andreas Richter: Univ. of Bremen Greg Huey: Georgia Tech John S. Holloway: NOAA May 28, 2009

  2. IB Io dτ(η) Earth Surface Local AMF Calculation Geometric AMF: Shape factor eta (η) Radiative Transfer Model (LIDORT) Atmospheric Chemistry Model (GEOS-Chem) SO2 mixing ratio, CSO2(η) Scattering weight • Calculate ω(η) as function of: • solar and viewing zenith angle (θs, θv) from OMI, SCIAMACHY • surface reflectivity (TOMS Climatology) • pressure, aerosol from GEOS-Chem • Clouds, O3 column from OMI, SCIAMACHY For individual scenes

  3. SO2 Slant Column

  4. Reference Sector Correction

  5. GEOS-Chem Simulation • GEOS-Chem v8-01-04 • - GEOS-4, 30 η vertical levels, 2º latitude by 2.5º longitude • - Based on EDGAR inventory • - Regional inventories: NEI99, BRAVO, CAC, Streets, EMEP

  6. Shape Factor: GEOS-Chem vs In-situ Differences would change AMF by <10% In-situ platform DC-8 & C-130

  7. OMI SO2 AMF for 2006 • Calculated at 313.2 nm; Cloud Radiance Fraction < 0.2; SZA < 70 • SCIAMACHY AMF at 319.7 nm within 25%

  8. Local AMF Increases Agreement with Aircraft ▲ INTEX-A ■ INTEX-B

  9. SO2 Vertical Columns for 2006 Correlation with GEOS-Chem (GC) : Globally r ~0.78 : ~0.84 over US : ~0.83 over China GC with OMI AMF within 10% GC with SCIAMACHY AMF Cloud Radiance Fraction < 0.2; SZA < 70

  10. Sensitivity of Retrieved SO2 to ΔEmissions GEOS-Chem SO2 changes by ×2 OMI SO2 AMF changes < 30%

  11. Fraction of Anthropogenic SO2

  12. Summary • Local AMFs improve agreement of OMI and SCIAMACHY with in-situ • Validation of SO2 vertical columns from SCIAMACHY and OMI with airborne in-situ measurements for INTEX-A and B • : r = 0.9 • Validation of GEOS-Chem SO2 shape factors • with airborne in-situ measurements for INTEX-A and B • : <10% change in AMF • Large signal from anthropogenic emissions in retrieved SO2 columns

More Related