Retrieval of SO2 Vertical Columns from SCIAMACHY and OMI: Air Mass Factor Algorithm Development and Validation Chulkyu Lee, Aaron van Dokelaar, Gray O’Byrne:

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Presentation transcript:

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 24, 2009 AGU 2009 Joint Assembly

Outline 1 SO2 Measurements from Space 2 Air Mass Factor (AMF) 3 Vertical Columns 3 Comparison & Validation 4 Summary 5

SO2 Measurements from Space TOMS (1978-2008) Total Ozone Mapping Spectrometer (Kruger et al., 1983, 1995) GOME (1995-2003) Global Ozone Monitoring Experiment (Eisinger and Burrows, 1998; Khokhar et al., 2005, 2008; Thomas et al., 2005) SCIAMACHY (2002 - ) Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (Richter et al., 2006; Lee et al., 2008a, 2008b) OMI (2004 - ) Ozone Monitoring Instrument (Krotkov et al., 2006, 2008; Yang et al., 2008) GOME-2 (2006 - ) Global Ozone Monitoring Experiment 2

SCIAMACHY and OMI Instrument Satellite platform Launching Year Equator Crossing Time Spectral Resolution Spatial Resolution Horizontal (km2) Global coverage SCIAMACHY ENVISAT 2002 10:00 LT 0.25 – 0.4 nm 30×60 6 days OMI EOS-Aura 2004 13:30 LT 0.5 nm 13×24 1 day HIRDLS and MIPAS measure NO2 profile in the upper troposphere

Local AMF Calculation Radiative Transfer Model * Based on Palmer et al., JGR, 2001; Martin et al., JGR, 2002 Geometric AMF: Radiative Transfer Model Atmospheric Chemistry Model Shape factor SO2 mixing ratio, CSO2(η) eta (η) dt(η) Io IB Earth Surface Scattering weight May previous AMFs have assumed a global uniform value. (η) is temperature-dependent cross-section Scattering weight For individual scenes Calculate ω(η) as function of: solar and viewing zenith angle (θs, θv) surface reflectivity, pressure cloud pressure, aerosol O3 column:

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 Update of the eruptive volcanic inventory for 2006 using the database of Global Volcanism Program (GVP: http://www.volcano.si.edu/)

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

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%

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

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

AMF error from surface reflectivity, shape factor, aerosol, cloud Error Analysis AMF error from surface reflectivity, shape factor, aerosol, cloud Polluted: SO2 > 1016 molec/cm2 Cloud Radiance Fraction < 0.2; SZA < 70

Error Analysis : 40-55% over the eastern US : 80% over China

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

Summary Calculation of local AMFs corrected for aerosol and O3 Validation of GEOS-Chem SO2 shape factors with airborne in-situ measurements for INTEX-A and B : <10% change in AMF Validation of SO2 vertical columns from SCIAMACHY and OMI with airborne in-situ measurements for INTEX-A and B : r = 0.9 Large signal from surface emissions in retrieved SO2 columns