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Airborne aerosol in situ measurements during TCAP [electronic resource] : A closure study of total scattering

Published:
Washington, D.C. : United States. Office of the United States Secretary of Energy, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
pages 1,069-1,101 : digital, PDF file
Additional Creators:
Brookhaven National Laboratory, United States. Office of the United States Secretary of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
We present a framework for calculating the total scattering of both non-absorbing and absorbing aerosol at ambient conditions from aircraft data. Our framework is developed emphasizing the explicit use of chemical composition data for estimating the complex refractive index (RI) of particles, and thus obtaining improved ambient size spectra derived from Optical Particle Counter (OPC) measurements. The feasibility of our framework for improved calculations of total scattering is demonstrated using three types of data collected by the U.S. Department of Energy’s (DOE) aircraft during the Two-Column Aerosol Project (TCAP). Namely, these data types are: (1) size distributions measured by a suite of OPC’s; (2) chemical composition data measured by an Aerosol Mass Spectrometer and a Single Particle Soot Photometer; and (3) the dry total scattering coefficient measured by a integrating nephelometer and scattering enhancement factor measured with a humidification system. We demonstrate that good agreement (~10%) between the observed and calculated scattering can be obtained under ambient conditions (RH < 80%) by applying chemical composition data for the RI-based correction of the OPC-derived size spectra. We also demonstrate that ignoring the RI-based correction or using non-representative RI values can cause a substantial underestimation (~40%) or overestimation (~35%) of the calculated scattering, respectively.
Report Numbers:
E 1.99:bnl--108230-2015-ja
bnl--108230-2015-ja
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Note:
Published through SciTech Connect.
07/31/2015.
"bnl--108230-2015-ja"
"KP1701000"
Atmosphere (Basel) 6 8 ISSN 2073-4433 AM
Kassianov, Evgueni; Sedlacek, Arthur; Berg, Larry; Pekour, Mikhail; Barnard, James; Chand, Duli; Flynn, Connor; Ovchinnikov, Mikhail; Schmid, Beat; Shilling, John; Tomlinson, Jason; Fast, Jerome.
Funding Information:
SC00112704
2016-BNL-EE630EECA-Budg
View MARC record | catkey: 23777848