10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Overview of the First In-situ Intercomparison of Aerosol Photoacoustic Spectrometers
CHRISTOPHER ZANGMEISTER, James Radney, National Institute of Standards and Technology
Abstract Number: 927 Working Group: Instrumentation
Abstract We describe results from the first intercomparison of aerosol photoacoustic spectrometers using a carbon black material. Data was collected by 12 laboratories located across North America, Europe and Asia. Absorption cross sections were measured using a well-defined, easily dispersible material distributed by the National Institute of Standards and Technology (NIST) to each participating laboratory, enabling the assessment of the variability in aerosol absorption measurements under well-controlled laboratory settings at each participants home institution. The participating laboratories measured aerosol absorption cross sections, of mobility and, if possible, mobility and mass selected aerosols. The data was reported in terms of absorption cross-section per particle or the mass-specific absorption cross section (MAC). The data will be discussed in terms of the comparability of data across all participating laboratories and as a function of the methods of particle selection (i.e. mobility versus mobility and mass) and wavelength. We envision, the results generated from these data will enable best practices to be developed by the community for the calibration and operation of aerosol photoacoustic spectrometers.