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Vijay Natraj (California Institute of Technology) Hartmut Bösch (Jet Propulsion Laboratory) Yuk Yung (California Institute of Technology). Quantifying Aerosol Types and Their Impact on Trace Gas Retrievals From Satellite Measurements.

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Vijay Natraj (California Institute of Technology) Hartmut Bösch (Jet Propulsion Laboratory)Yuk Yung (California Institute of Technology)

Quantifying Aerosol Types and Their Impact on Trace Gas Retrievals From Satellite Measurements

AGU Fall Meeting December 4, 2005

major source of retrieval uncertainty
Photon path length is enhanced through multiple scattering by aerosols

Incident light

Light reaching the detector

Aerosol Layer 1

Aerosol Layer 2

Ground surface

Major Source of Retrieval Uncertainty

AGU Fall Meeting December 4, 2005

global aerosol climatology
Global Aerosol Climatology

Courtesy: Kahn et al, 2001

AGU Fall Meeting December 4, 2005

aerosol optical properties
Aerosol Optical Properties
  • Each mixing group is a combination of 4 different aerosol components from a basic set of 7 (Kahn et al., 2001).
  • Sulfate (land/water), seasalt, carbonaceous, black carbon: spherical => Mie code (de Rooij and van der Stap, 1984)
  • Mineral dust (accumulated/coarse): mixture of oblate and prolate spheroids => T-matrix code (Mishchenko and Travis, 1998)
  • Lognormal distribution
  • Polarization fully considered

AGU Fall Meeting December 4, 2005

scattering matrix 755 nm
Scattering Matrix (755 nm)

AGU Fall Meeting December 4, 2005

forward model details
Forward Model Details
  • Park Falls, Wisconsin, July (SZA = 31 degrees)
  • Exponential drop-off in aerosol extinction (scale height: ~ 1 km, optical depth: 0.1)
  • OCO spectral regions
  • Forward model: RADIANT (Christi, CSU) + single scattering approximation for polarization
  • Lorentzian instrument lineshape function (resolving powers: O2A band: 17000, CO2 bands: 20000)

AGU Fall Meeting December 4, 2005

weighting functions o 2 a band
Weighting Functions (O2A Band)

AGU Fall Meeting December 4, 2005

weighting functions weak co 2 band
Weighting Functions (Weak CO2 Band)

AGU Fall Meeting December 4, 2005

weighting functions strong co 2 band
Weighting Functions (Strong CO2 Band)

AGU Fall Meeting December 4, 2005

retrieval groups single scattering albedo
Retrieval Groups: Single Scattering Albedo

AGU Fall Meeting December 4, 2005

sensitivity tests
Sensitivity Tests
  • Measurement error: 0.43 ppm
  • Smoothing error: 0.29 ppm
  • Error due to incorrect assumption of aerosol type within retrieval group
    • Group 1: 0.27 ppm
    • Group 2: 0.02 ppm
    • Group 3: 0.03 ppm

AGU Fall Meeting December 4, 2005

conclusions
Conclusions
  • Aerosol retrieval groups determined from basic aerosol mixing groups
  • Choosing incorrect mixing group within retrieval group leads to small errors
  • Need to test more scattering geometries to validate retrieval types
  • More realistic aerosol profiles need to be included

AGU Fall Meeting December 4, 2005

acknowledgments
Acknowledgments
  • OCO L2 Team (JPL)
  • Matt Christi (CSU)
  • Michael Mishchenko (GISS)
  • Olga Kalashnikova and Ralph Kahn (JPL)

AGU Fall Meeting December 4, 2005

related talks posters
Related Talks/Posters
  • Charles Miller (A14C-02)
  • Hartmut Boesch (A12D-05)
  • Gretchen Aleks (A33B-0883)

AGU Fall Meeting December 4, 2005

importance of polarization
Importance of Polarization
  • Need to consider both atmospheric/surface and instrumental polarization

AGU Fall Meeting December 4, 2005

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