HR: 16:15h
AN: A34B-02    [Abstracts]
TI: Characterization of a Single Particle Soot Photometer (SP2)
AU: * Schwarz, J P
EM: joshua.p.schwarz@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL6, Boulder, CO 80305 United States
AU: Gao, R S
EM: gao@al.noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL6, Boulder, CO 80305 United States
AU: Fahey, D W
EM: David.W.Fahey@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL6, Boulder, CO 80305 United States
AU: Watts, L A
EM: jschwarz@al.noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL6, Boulder, CO 80305 United States
AU: Langford, A O
EM: andrew.o.langford@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL8, Boulder, CO 80305 United States
AU: Thomson, D S
EM: david.s.thomson@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL6, Boulder, CO 80305 United States
AU: Kok, G L
EM: jschwarz@al.noaa.gov
AF: Droplet Measurement Technologies, Inc, 5710 Flatiron Parkway, Suite B, Boulder, CO 80301 United States
AU: Wilson, J C
EM: jwilson@du.edu
AF: University of Denver, Department of Physics, Denver, CO 80208 Mexico
AB: We have characterized a new type of sensor that detects individual soot particles -- the Single Particle Soot Photometer (SP2) developed by Droplet Measurement Technologies, Inc. The SP2 performs a two-color measurement of the blackbody emission from light-absorbing refractory aerosols as they are heated by an intra-cavity infrared laser beam. The light scattered from sampled particles is also recorded, as in a conventional optical particle counter. These measurements allow individual light-absorbing refractory particles to be differentiated from non-absorbing aerosols. The incandescence temperature derived from the two-color measurement constrains the refractory composition of the particle. We have quantified the SP2 response to a variety of elemental-carbon and non-carbon particles available commercially and have also sampled ambient aerosols near the laboratory. The laboratory results demonstrate the ability of the SP2 to identify elemental-carbon containing aerosols, its insensitivity to ambient pressure changes, and its good alignment stability. The instrument, which has been configured for use on the NASA WB-57F aircraft, will have its first flights from Houston in October 2004. It will sample soot particles in the upper troposphere and lower stratosphere. A two-channel SP2 instrument configuration will be described for use in 2005.
DE: 4801 Aerosols (0305)
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting