HR: 1340h
AN: A33C-1423    [Abstracts]
TI: Relations between cloud condensation nuclei and aerosol optical properties: Their sensitivities to size, composition and hygroscopicity observed from aircraft for biomass burning, urban pollution, dust and sea-salt particles over North America
AU: * Shinozuka, Y
EM: yohei@hawaii.edu
AF: University of Hawaii, 1000 Pope Road, Honolulu, HI 96822, United States
AU: Clarke, A D
EM: tclarke@soest.hawaii.edu
AF: University of Hawaii, 1000 Pope Road, Honolulu, HI 96822, United States
AU: Kapustin, V N
EM: kapustin@soest.hawaii.edu
AF: University of Hawaii, 1000 Pope Road, Honolulu, HI 96822, United States
AU: Howell, S G
EM: showell@soest.hawaii.edu
AF: University of Hawaii, 1000 Pope Road, Honolulu, HI 96822, United States
AU: Zhou, J
EM: jczhou@hawaii.edu
AF: University of Hawaii, 1000 Pope Road, Honolulu, HI 96822, United States
AU: McNaughton, C S
EM: cameronm@soest.hawaii.edu
AF: University of Hawaii, 1000 Pope Road, Honolulu, HI 96822, United States
AU: Roberts, G
EM: gcroberts@ucsd.edu
AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, La Jolla, CA 92093, United States
AU: DeCarlo, P
EM: peter.decarlo@colorado.edu
AF: University of Colorado, UCB 216, Boulder, CO 80309-0216, United States
AU: Jimenez, J
EM: jose.jimenez@colorado.edu
AF: University of Colorado, UCB 216, Boulder, CO 80309-0216, United States
AB: The aerosol distribution and the subset known as cloud condensation nuclei (CCN) is too heterogeneous in space and time to comprehensively measure from ground, ship or aircraft. Global assessment of aerosol effects must depend upon the extended and frequent coverage available from satellite. Satellites, however, do not directly measure the CCN concentration. Satellite radiances are received from particles larger than most CCN, and these are converted to aerosol size distributions based on predetermined aerosol models. We evaluate satellite capabilities to estimate the CCN concentrations given the properties of our observed size distributions and aerosol physico-chemistry. These aerosol properties are derived from aircraft measurements made over North America with NASA DC-8 and NCAR C-130 during INTEX-NA, INTEX-B and MILAGRO campaigns. The relations between the aerosol optical properties and CCN concentrations are examined for the various meteorological, geographical and anthropogenic conditions encountered during the experiments. When volatile organic concentration was high relative to ions, the OPC number tended to be greater than the CCN measured at about 0.2% supersaturation. The aerosol size distribution and composition, which are major factors in determining the CCN concentration, may be constrained with the extinction coefficient, the wavelength dependences of scattering and of absorption, and possibly the single scattering albedo. These revealed relations are being screened and stratified to assess whether the satellite CCN retrieval algorithm can be improved.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting