HR: 10:20h
AN: A42A-01    [Abstracts]
TI: Comparison of Airborne Sunphotometer and Satellite Sensor Retrievals of Aerosol Optical Depth during MILAGRO/INTEX-B
AU: * Redemann, J
EM: jredemann@mail.arc.nasa.gov
AF: Bay Area Environmental Research Institute, 560 Third St. W, Sonoma, CA 95476, United States
AU: Livingston, J
EM: jlivingston@mail.arc.nasa.gov
AF: SRI International, G-179 333 Ravenswood Ave. , Menlo Park, CA , United States
AU: Russell, P
EM: prussell@mail.arc.nasa.gov
AF: NASA Ames Research Center, MS 245-5, Moffett Field, CA , United States
AU: Johnson, R
EM: Roy.R.Johnson@nasa.gov
AF: NASA Ames Research Center, MS 245-5, Moffett Field, CA , United States
AU: Zhang, Q
EM: zhang@baeri.org
AF: Bay Area Environmental Research Institute, 560 Third St. W, Sonoma, CA 95476, United States
AU: Remer, L
EM: remer@climate.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code 513.2, Greenbelt, MD , United States
AU: Kahn, R
EM: Ralph.Kahn@jpl.nasa.gov
AF: Jet Propulsion Laboratory /CalTech, MS 169-237 4800 Oak Grove Dr., Pasadena, CA , United States
AU: Torres, O
EM: torres@qhearts.gsfc.nasa.gov
AF: UMBC / NASA GSFC, Code 613.3 , Greenbelt, MD , United States
AU: Veihelmann, B
EM: veihelma@knmi.nl
AF: Royal Netherlands Meteorological Institute (KNMI), P.O.Box 201 , De Bilt, Netherlands
AU: Veefkind, P
EM: Veefkind@knmi.nl
AF: Royal Netherlands Meteorological Institute (KNMI), P.O.Box 201 , De Bilt, Netherlands
AU: Smirnov, A
EM: asmirnov@aeronet.gsfc.nasa.gov
AF: UMBC / NASA GSFC, Code 613.3 , Greenbelt, MD , United States
AU: Holben, B
EM: brent@aeronet.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code 513.2, Greenbelt, MD , United States
AB: The 14-channel Ames Airborne Tracking Sunphotometer (AATS-14) was operated on a Jetstream 31 (J31) aircraft based in Veracruz, Mexico in March 2006 during MILAGRO/INTEX-B (Megacity Initiative-Local And Global Research Observations Phase B of the Intercontinental Chemical Transport Experiment). AATS measured aerosol optical depth (AOD) at 13 wavelengths (354-2139 nm) and water vapor column content in 13 flights that sampled clean and polluted airmasses over the Gulf of Mexico and Mexico City. J31 flights were coordinated with overflights of several satellites, including Aqua, Aura, Terra, and Parasol. In this paper we will focus on comparing AATS retrievals of AOD with corresponding AOD values retrieved from spatially and temporally coincident or near- coincident measurements acquired by the satellite sensors MODIS (Aqua and Terra), MISR (Terra), and OMI (Aura). Our preliminary analyses of 37 coincident observations by AATS and MODIS-Terra and 18 coincident observations between AATS and MODIS-Aqua indicate that for MODIS-Terra, 98 percent of near-IR AOD retrievals fall within the estimated uncertainty range ± 0.03 ± 0.05 AOD, while 100 percent of MODIS-Aqua near-IR AOD retrievals fall within this uncertainty range. Collocated measurements by AATS, MODIS-Terra and MISR within three MISR retrieval grid cells over the Gulf of Mexico on March 10 have been analyzed. Mid-visible (at 446 and 558 nm) AOD retrievals produced by the MISR standard operational algorithm Version 19 compare well both with AATS and with MODIS-Terra observations in two of the three MISR grid cells, while the MISR AOD retrievals in the third cell exceed those obtained from AATS or MODIS. Aerosol data products produced by OMI include AOD, single scattering albedo (SSA), and aerosol indices. These OMI aerosol products are derived using wavelengths and algorithms that differ significantly from those of MODIS and MISR. We have identified four Aura overpasses during MILAGRO/INTEX-B for which OMI AOD spectra have been retrieved using the UV and the multiwavelength retrieval algorithms and AATS AOD spectra have been calculated at coincident or near-coincident times and locations. Three of these (March 3, 10 and 17) were over the Gulf of Mexico, and one (March 19) was over Mexico City. In general, OMI AOD retrievals exceed corresponding AATS AOD values.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0360 Radiation: transmission and scattering
DE: 1630 Impacts of global change (1225)
DE: 1640 Remote sensing (1855)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly