Rong-Ming Hu and Randall Martin Inspiring Minds. Retrieval of Aerosol Single Scattering Albedo (SSA)  Determined with radiative transfer calculation.

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Presentation transcript:

Rong-Ming Hu and Randall Martin Inspiring Minds

Retrieval of Aerosol Single Scattering Albedo (SSA)  Determined with radiative transfer calculation as SSA that reproduces TOMS Aerosol Index when constrained by MODIS aerosol optical depth and GEOS-CHEM aerosol vertical profile. MODIS AOD GEOS–CHEM Aerosol Profile LIDORT Calculated Observed (TOMS) AI TOMS AI

331 nm and 360 nm

Optical depth at 360nm

Aerosol profile from GEOS-CHEM and validation with ARM data Southern Great Plains, Lamont, Oklahoma (DOE/ARM site). Results are for 324 profiles from March, 2000 to March, Solid: GEOS-CHEM simulations. Asterisk, plus, diamond, triangle and square: NOAA/CMDL measurements.

Validation with in situ lidar data (April, 2001) Gobi Desert Dust Storm (MODIS). Solid: GEOS-CHEM simulations. Asterisk: lidar measurements in Cheju island (SNU, South Korea) Cheju

Aerosol Single Scattering Albedo from retrieval

Intercomparison with AERONET square: MAM, asterisk: JJA, triangle: SON, plus sign: DJF.

Sensitivity to Aerosol Optical depth and surface reflectivity Solid: surface reflectivity=0.05. Dashed: surface reflectivity=0.08. Dotted: surface reflectivity=0.15.

Uncertainty in retrieved ω 0 Parameter Input Uncertainty Retrieval Uncertainty TOMS AI ±0.01 ± 0.01 MODIS AOD 20% ± 0.05 land, 5% ± 0.03 ocean ± 0.08 Ångström exponent ±15 % ± 0.11 Surface reflectivity ±0.01 ± 0.02 Refractive index ±0.01 ± 0.02 Profile ±25 % ± 0.05 Combined ± 0.15

Conclusion  Low values of aerosol single scattering albedo near 0.8 occur in biomass burning and mineral dust regions.  Seasonal variation of single scattering albedo is associated with both mineral dust and biomass burning.  Retrieval results present  Retrieval results present a high degree of consistency with AERONET measurements; AERONET measurements; the correlation coeffcient, slope and intercept are 0.75, 0.93 and respectively.   The dominant terms of retrieval uncertainty are the Ångström exponent, the aerosol optical depth and aerosol profiles contributing to a total uncertainty of 15 percent.