HR: 14:25h
AN: A43E-04    [Abstracts]
TI: Atmospheric Measurement of Optical Extinction by Aerosol Using the Cavity Ring-down Technique
AU: * Baynard, T
EM: tbaynard@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 S. Broadway, Boulder, CO 80305 United States
AU: * Baynard, T
EM: tbaynard@al.noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AU: Pettersson, A
EM: apettersson@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 S. Broadway, Boulder, CO 80305 United States
AU: Pettersson, A
EM: apettersson@al.noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AU: Lovejoy, E
EM: nlovejoy@al.noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AU: Brown, S
EM: sbrown@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 S. Broadway, Boulder, CO 80305 United States
AU: Brown, S
EM: sbrown@al.noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AU: Osthoff, H
EM: hostoff@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 S. Broadway, Boulder, CO 80305 United States
AU: Osthoff, H
EM: hostoff@al.noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AU: Dube, B
EM: bdube@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 S. Broadway, Boulder, CO 80305 United States
AU: Dube, B
EM: bdube@al.noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AU: Cicoria, S
EM: scicoria@al.noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AU: Quinn, P
EM: patricia.k.quinn@noaa.gov
AF: NOAA PMEL, 7600 Sand Point Way, NE, Seattle, WA 98115 United States
AU: Coffman, D
EM: derek.coffman@noaa.gov
AF: NOAA PMEL, 7600 Sand Point Way, NE, Seattle, WA 98115 United States
AU: Covert, D
EM: dcovert@u.washington.edu
AF: University of Washington, Department of Atmospheric Sciences, Seattle, WA 98195 United States
AU: Sierau, B
EM: bsierau@u.washington.edu
AF: University of Washington, Department of Atmospheric Sciences, Seattle, WA 98195 United States
AU: Wang, W
EM: weiwang@uiuc.edu
AF: University of Illinois, Department of Civil and Environmental Engineering, Urbana, IL 61801 United States
AU: Rood, M
EM: mrood@uiuc.edu
AF: University of Illinois, Department of Civil and Environmental Engineering, Urbana, IL 61801 United States
AU: Ravishankara, A
EM: ravi@al.noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AB: Accurate measurement of the optical properties of aerosol is important for quantifying their influence on climate. Important parameters include extinction, functional dependence of light-extinction on relative humidity f(RH), angular scattering distribution, and single scattering albedo as a function of wavelength. We have developed a field system for the direct measurement of optical extinction by aerosol based on Cavity Ring-Down (CRD) technique. The system measures extinction and f(RH) at four wavelengths with excellent sensitivity and time response. Complementary measurement of scattering or absorption is required to determine the single scattering albedo. We will present results for optical extinction by atmospheric aerosols at 355 nm, 532 nm, 683 nm, and 1064 nm along with comparison to extinction determined by the sum of light scattering (nephelometer) and absorption (particle soot absorption photometer) measured in the marine boundary layer in the Gulf of Maine and vicinity during ICARTT/NEAQS (International Consortium for Atmospheric Research on Transport and Transformation) onboard the {\it NOAA RV Ronald H. Brown}.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting