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AERONET Processing Algorithms Refinement

Explore AERONET inversion & flux measurement products, calibration data, cloud screening, & more presented at the 2004 workshop in Spain. Learn about optical depth corrections, extraterrestrial solar flux, and precipitable water computations.

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AERONET Processing Algorithms Refinement

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  1. AERONET Processing Algorithms Refinement AERONET Workshop May 10 - 14, 2004, El Arenosillo, Spain

  2. Inversion products Volume size distribution (0.05<R<15 mm), refractive index, single scattering albedo (l=440, 670, 870, 1020 nm) AERONET Data Flows http://aeronet.gsfc.nasa.gov Holben et al. RSE, 1998 Holben et al. JGR, 2001 Flux measurements Direct - l=340, 380, 440, 500, 670, 870, 940, 1020 nm Diffuse - l=440, 670, 870, 1020 nm (alm, pp, pol) Calibration and processing information Eck et al. JGR, 1999 Aerosol optical depth and precipitable water computations Smirnov et al. RSE, 2000 Cloud screening and quality control Dubovik and King JGR, 2000 Dubovik et al.JGR, 2000

  3. AERONET Data Flows Current andfutureadditions Flux measurements Sun - l=340, 380, 440, 500, 670, 870, 940, 1020 nm +1640 nm (412, 532, 555 nm) Sky - l=440, 670, 870, 1020 nm +500, 1640 nm + ? 340, 380 nm Calibration and processing information H2O, CO2, CH4 Aerosol optical depth and precipitable water computations(1020, 1640, 940 nm) + extra ta(1020 nm) Cloud screening and quality control Inversion products Almucantar retrievals - spherical and spheroid models (4 wavelengths), level 2 Almucantar retrievals - 6 wavelengths+ ? 340, 380 nm Principal plane retrievals -4 wavelengths, level 2; ? 6 wavelengths ? Combined retrievals (almucantar and principal plane)

  4. Current Processing Algorithm • Extraterrestrial Solar Flux - Neckel and Labs 1981; and Frohlich and Wehrli 1981 • Rayleigh optical depth - Edlen 1966 • Ozone amount - LUT (5ºx 5º Lat Long) - London et al. 1976 • Water vapor content - Bruegge et al. 1992; Reagan et al. 1992 • Water vapor correction for AOD (1020 nm) - none • CO2, CH4, WV for AOD (1640 nm) - N/A

  5. Processing Algorithm Refinement • Extraterrestrial Solar Flux - Woods et al. 1996 • Rayleigh optical depth - Bodhaine et al. 1999 • Ozone amount - LUT (1ºx 1º Lat Long) - TOMS data 1979-2002 • Water vapor content - Michalsky et al. 1995; Schmid et al. 1996 • Water vapor correction for AOD (1020 nm) - LBLRTM • CO2, CH4, WV for AOD (1640 nm) - LBLRTM

  6. Extraterrestrial Solar Flux www.astm.org

  7. Courtesy Dr. Jay Herman, code 916, NASA/GSFC

  8. Rayleigh Optical Depth

  9. Rayleigh Optical Depth

  10. V(l) = V0(l)d-2 exp{-m[ta(l)+tr(l)]}Tw(l) Tw(l) = ∫ E0(l)S(l)exp[-mtw(l)] dl / E0(l)S(l)dl Tw = exp(-A(mu)B) Ln V(l) + m[ta(l)+tr(l)]= = Ln [V0(l)d-2] - A(mu)B

  11. Parameters A and B for various filter batches

  12. Optical Depth Correction at 1020 nm

  13. Optical Depth Correction at 1640 nm

  14. AERONET Precipitable Water Comparison

  15. AERONET-GPS Precipitable Water Comparison

  16. AERONET-GPS Precipitable Water Comparison

  17. What to do next • Recalibrate Master instruments (water vapor channel only) • Recalculate calibration constants (water vapor channel only) for all instruments in the network • Update database on water vapor content • Quality assure PW (WVC) database • Compare QC/QA PW with GPS and MWR retrievals

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