AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Black Carbon Measurement Intercomparison during the 2017 Black Carbon Shootout
TAYLOR SHINGLER, Richard Moore, Claire Robinson, Edward Winstead, Ewan Crosbie, Luke Ziemba, Kenneth Thornhill, Michael Shook, Bruce Anderson, NASA
Abstract Number: 789 Working Group: Combustion
Abstract The NASA Langley Aerosol Research Group (LARGE) provides multiple black carbon (BC) based aerosol particle measurements and engine emission factors for airborne and ground-based field campaigns and laboratory studies. These datasets are made available to the general public where accuracy is key to enable further use in environmental assessments, models, and validation studies. Studies are needed to establish the accuracy and precision of BC measurements of particles with varying physical properties using variety of detection techniques. Work is also needed to develop calibration and correction schemes for new sensors and to link these measurements to heritage instruments on which our understanding of BC emissions and characteristics has been established. Black carbon particles were produced from a mini-CAST (Jing) diffusion flame soot generator and passed to instruments measuring optical absorption, extinction, scattering, and black carbon mass. Generated particles were analyzed with and without treatment from a 350 C thermal denuder. Filter based measurements of optical absorption were performed using a PSAP (Radiance Research) and a TAP (BMI). Absorption was also measured using two photoacoustic based instruments: the MSS-plus (AVL) and PASS-3 (DMT). Measurements of aerosol extinction and scattering were performed using three CAPS PM-ex (Aerodyne Research) instruments at multiple wavelengths and an integrating nephelometer (Air Photon). Black carbon mass was also measured using laser incandescence from two separate LII-300 (Artium Technologies) instruments (standard and high-sensitivity). Mass measurements were inferred using filters collected concurrently during sampling and analyzed by an OC/EC (Sunset Labs). Black carbon quantification measurements are analyzed between instruments to assess agreement between platforms using manufacturer’s calibration settings as well as after calibrations performed to a single standard soot source (mini-CAST).