HR: 11:50h
AN: A21G-06    [PDF]
TI: Measurement and modeling of vertically resolved aerosol optical properties and radiative fluxes over the ARM SGP site
AU: * Schmid, B
AF: Bay Area Environmental Research Institute, 3rd St. West, Sonoma, CA 95476
AU: Arnott, W
AF: Desert Research Institute, Raggio Parkway, Reno, NV 89512
AU: Bucholtz, A
AF: Naval Research Lab, Grace Hopper Ave, Monterey, CA 93943
AU: Colarco, P
AF: GEST, NASA GSFC, Greenbelt, MD 20771
AU: Covert, D
AF: University of Washington, Atmospheric Sciences, Seattle, WA 98195
AU: Eilers, J
AF: NASA, ARC, Moffett Field, CA 94035
AU: Elleman, R
AF: University of Washington, Atmospheric Sciences, Seattle, WA 98195
AU: Ferrare, R
AF: NASA, Langley, Hampton, VA 23681
AU: Flagan, R
AF: California Institute of Technology, Chemical Engineering, Pasadena, CA 91125
AU: Jonsson, H
AF: CIRPAS, Imjin Rd, Marina, CA 93933
AU: Pilewskie, P
AF: NASA, ARC, Moffett Field, CA 94035
AU: Pommier, J
AF: Bay Area Environmental Research Institute, 3rd St. West, Sonoma, CA 95476
AU: Redemann, J
AF: Bay Area Environmental Research Institute, 3rd St. West, Sonoma, CA 95476
AU: Ricci, K
AF: Bay Area Environmental Research Institute, 3rd St. West, Sonoma, CA 95476
AU: Rissman, T
AF: California Institute of Technology, Chemical Engineering, Pasadena, CA 91125
AU: Seinfeld, J
AF: California Institute of Technology, Chemical Engineering, Pasadena, CA 91125
AU: Strawa, A
AF: NASA, ARC, Moffett Field, CA 94035
AU: VanReken, T
AF: California Institute of Technology, Chemical Engineering, Pasadena, CA 91125
AU: Wang, J
AF: Brookhaven, National Lab, Upton, NY 11973
AU: Welton, E
AF: NASA, GSFC, Greenbelt, MD 20771
AB: In order to meet one of its goals - to relate observations of radiative fluxes and radiances to the atmospheric composition - the Department of Energy's Atmospheric Radiation Measurement (ARM) program has pursued measurements and modeling activities that attempt to determine how aerosols impact atmospheric radiative transfer, both directly and indirectly. However, significant discrepancies between aerosol properties measured in situ or remotely remain. One of the objectives of the Aerosol Intensive Operational Period (IOP) conducted by ARM in May 2003 at the ARM Southern Great Plains (SGP) site in north central Oklahoma was to examine and hopefully reduce these differences. The IOP involved airborne measurements from two airplanes over the heavily instrumented SGP site. We give an overview of airborne results obtained aboard the Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) Twin Otter aircraft. The Twin Otter performed 16 research flights over the SGP site. The aircraft carried instrumentation to perform in-situ measurements of aerosol absorption, scattering, extinction and particle size. This included such novel techniques as the photoacoustic and cavity ring-down methods for in-situ absorption (675 nm) and extinction (675 and 1550 nm) and a new multiwavelength, filter-based absorption photometer (467, 530, 660 nm). A newly developed instrument measured cloud condensation nucleus concentration (CCN) concentrations at two supersaturation levels. Aerosol optical depth and extinction (354-2139 nm) were measured with the NASA Ames Airborne Tracking 14-channel sunphotometer. Furthermore, up- and downwelling solar (broadband and spectral) and infrared radiation were measured using seven individual radiometers. Three up-looking radiometers were mounted on a newly developed stabilized platform, keeping the instruments level up to aircraft pitch and roll angles of $\sim10\deg$. This resulted in unprecedented continuous vertical profiles of radiative fluxes, which we will compare to modeled fluxes using the aforementioned data as input. We will also present comparisons of the vertically resolved aerosol optical properties measured aboard the Twin Otter and from two ground-based lidar systems. Finally we use a trajectory model and a three-dimensional aerosol transport and microphysics model to explore the long-range transport and evolution of smoke aerosols from Siberian fires observed over SGP May 25-28, 2003.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting