Aerosol Optical Depth Comparisons ARM Aerosol IOP May

Aerosol Optical Depth Comparisons ARM Aerosol IOP – May 2003 CIRPAS Twin Otter Elevated Smoke Layers from Siberia Elevated layer as seen from Twin Otter on May 27, 2003 Photo courtesy of Roy Woods MODIS 5/14/2003 http: //rapidfire. sci. gsfc. nasa. gov/gallery/? 2003134 -0514 • Aerosol: number, size distr. , scattering, absorption (photoacoustic), extinction (cavity ring-down), hygroscopicity, aerosol optical depth MPL AATS-14 Model • Gases: Water vapor • Cloud: liquid water, droplet size distribution, CCN • Radiation: solar and IR, up and downwelling, broadband spectral Comparing airborne AATS-14 and ground-based AERONET AODs during 18 low-altitude fly-bys • Stabilized platform • Flew 60. 6 flight hours during 16 flights on 15 days Vertical profiles of aerosol extinction (525 nm) from AATS-14, lidar and model at the CART Site on May 27, 28, 29, 2003. AATS-14 (354 – 2139 nm) Water Vapor Comparisons Aerosol Extinction Closure Comparison of layer water vapor from AATS-14 and Edge. Tech chilled mirror insitu sensor for 35 vertical profiles. Aerosol optical depth profiles from AATS-14 at 13 wavelengths from 354 to 2139 nm. Aerosol extinction profiles from AATS-14 at 13 wavelengths from 354 to 2139 nm obtained by vertically differentiating the AOD profiles l = 675 nm Comparison of layer AOD for 26 profiles from AATS-14 and Nephelometer+PSAP (corrected to ambient). Comparison of aerosol optical depth profiles (l=675 nm) from AATS 4, from Nephelometer plus PSAP (corrected to ambient), and from Cadenza (Cavity-Ringdown instrument, corrected to ambient). In-situ profiles start at AATS-14 AOD Aerosol extinction profiles from 3 -l Nephelometer and 3 -l PSAP. Neph scattering is corrected to ambient conditions (RH, T, p) using scattering “growth” measured with three separate 1 -l Nephs. Comparison of aerosol extinction (l=675 nm) from Nephelometer plus PSAP (corrected to ambient), AATS-14 and Cadenza (Cavity. Ringdown instrument, corrected to ambient). Selection of 25 columnar water vapor profiles from AATS-14 using the 0. 94 -mm band l = 675 nm Comparison of water vapor density from AATS-14 and Edge. Tech chilled mirror insitu sensor for 35 vertical profiles. Comparison of layer AOD for 26 profiles from AATS-14 and Cadenza (Cavity-Ringdown instrument, corrected to ambient). Comparison of aerosol extinction from AATS-14 (l=1558 nm) and Cadenza (Cavity-Ringdown instrument, l=1550 nm, corrected to ambient). Water vapor density profiles by vertically differentiating the columnar water vapor profiles from AATS-14. Comparison with Edge. Tech chilled mirror in-situ sensor also shown