AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
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Mass-specific Extinction and Absorption Spectra of Particles from Kerosene-fueled Simple Wick Lamps
CHRISTOPHER ZANGMEISTER, James Radney, Courtney Grimes, Jessica Young, Rian You, Russell Dickerson, Michael Zachariah, National Institute of Standards and Technology
Abstract Number: 465 Working Group: Carbonaceous Aerosols in the Atmosphere
Abstract A recent global survey reported more than 3.25 x 10^8 kerosene-fueled simple wick lamps are in routine use consuming greater than 7.0 x 10^10 L of kerosene and producing 6 x 10^12 g of particulate emissions per year. To date little is known about the optical properties of particles produced from simple wick lamps and how these sources impact localized climate forcing. In this study we quantitatively measure absorption spectra and extinction from particles emitted from kerosene-fueled simple wick lamps. Data was collected in-situ of mass- and mobility-selected particles using a single wavelength cavity ringdown spectrometer and a broadband photoacoustic spectrometer, respectively. Lamps were sourced from both East Africa and the United States. The mass-specific absorption and extinction cross-sections – MAC and MEC– at λ = 660 nm were 12.1 ± 1.0 m^2 g-1 and 14.6 ± 1.4 m^2 g-1 yielding a single scattering albedo of 0.17 ± 0.03; all uncertainties are 2σ. Absorption spectra were measured from λ = 500 nm to 840 nm for aerosols with a mobility diameter of 500 nm. The measured absorption Ångström exponent (AAE) was 0.89 ± 0.10 and independent of particle mass. The MAC at λ = 550 nm was 16.5 ± 1.5 m^2 g-1, 2.5 times higher than previous measurements from kerosene-fueled simple wick lamps. The measured results are discussed for their potential impacts on localized climate forcing.