HR: 1340h
AN: A33A-0809    [Abstracts]
TI: Resolving Organized Aerosol Structures (Rolls and Layers) with Airborne Fast Mobility Particle Sizer (FMPS) During MILAGRO/INTEX Campaign
AU: * Kapustin, V
EM: kapustin@soest.hawaii.edu
AF: University of Hawaii, Department of Oceanography, 1000 Pope Rd., MSB 501, Honolulu, HI 96822, United States
AU: Clarke, A
EM: tclarke@soest.hawaii.edu
AF: University of Hawaii, Department of Oceanography, 1000 Pope Rd., MSB 501, Honolulu, HI 96822, United States
AU: Zhou, J
EM: jczhou@hawaii.edu
AF: University of Hawaii, Department of Oceanography, 1000 Pope Rd., MSB 501, Honolulu, HI 96822, United States
AU: Howell, S
EM: showell@soest.hawaii.edu
AF: University of Hawaii, Department of Oceanography, 1000 Pope Rd., MSB 501, Honolulu, HI 96822, United States
AU: Shinozuka, Y
EM: yohei@hawaii.edu
AF: University of Hawaii, Department of Oceanography, 1000 Pope Rd., MSB 501, Honolulu, HI 96822, United States
AU: Brekhovskikh, V
EM: verab@soest.hawaii.edu
AF: University of Hawaii, Department of Oceanography, 1000 Pope Rd., MSB 501, Honolulu, HI 96822, United States
AU: McNaughton, C
EM: cameronm@soest.hawaii.edu
AF: University of Hawaii, Department of Oceanography, 1000 Pope Rd., MSB 501, Honolulu, HI 96822, United States
AB: The Hawaii Group for Environmental Aerosol Research [http://www.soest.hawaii.edu/HIGEAR] deployed a wide range of aerosol instrumentation aboard the C-130 and the NASA DC-8 as part of MILAGRO/INTEX. These were designed to provide rapid information on aerosol composition, state of mixing (internal or external), spectral optical properties (scattering and absorption), the humidity dependence of light scattering-f(RH), and the role of condensed species in changing the absorption properties of black carbon (BC) and inferred properties of organic carbon (OC). These measurements included size distributions from about 7 nm up to about 10,000 nm and their volatility at 150, 300 and 400 C; size selected response to heating (volatility) to resolve the state of mixing of the aerosol; continuous measurements of the light scattering and absorption at 3 wavelengths; measurements of the f(RH). We also flew the first airborne deployment of the new Fast Mobility Particle Sizer (FMPS, TSI Inc.) that provided information on rapid (1Hz) size variations in the Aitken mode. This revealed small scale structure of the aerosol and allowed us to examine size distributions varying over space and time associated with mixing processes previously unresolved etc. Rapid measurements during profiles also revealed variations in size over shallow layers. Other dynamic processes included rapid size distribution measurements within orographically induced aerosol layers and size distribution evolution of the nanoparticles formed by nucleation (C-130 flights 5, 6 and 9). Evidence for fluctuations induced by underlying changes in topography was also detected. These measurements also frequently revealed the aerosol variability in the presence of boundary layer rolls aligned along the wind in the Marine Boundary Layer (Gulf region) both with and without visible cloud streets (DC-8 flight 4 and C-130 flight 7). This organized convection over 1-2 km scales influences the mixing processes (entrainment, RH) and related variability of aerosol concentration and optical properties.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0368 Troposphere: constituent transport and chemistry
DE: 4801 Aerosols (0305, 4906)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting