The complex refractive index of atmospheric and model humic-like substances (HULIS) retrieved by a cavity ring down aerosol spectrometer (CRD-AS)

Faraday Discussions
E DinarYinon Rudich

Abstract

Atmospheric aerosols absorb and reflect solar radiation causing surface cooling and heating of the atmosphere. The interaction between aerosols and radiation depends on their complex index of refraction, which is related to the particles' chemical composition. The contribution of light absorbing organic compounds, such as HUmic-LIke Substances (HULIS) to aerosol scattering and absorption is among the largest uncertainties in assessing the direct effect of aerosols on climate. Using a Cavity Ring Down Aerosol Spectrometer (CRD-AS), the complex index of refraction of aerosols containing HULIS extracted from pollution, smoke, and rural continental aerosols, and molecular weight-fractionated fulvic acid was measured at 390 nm and 532 nm. The imaginary part of the refractive index (absorption) substantially increases towards the UV range with increasing molecular weight and aromaticity. At both wavelengths, HULIS extracted from pollution and smoke particles absorb more than HULIS from the rural aerosol. Sensitivity calculations for a pollution-type aerosol containing ammonium sulfate, organic carbon (HULIS), and soot suggests that accounting for absorption by HULIS leads in most cases to a significant decrease in the single scatteri...Continue Reading

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Citations

Apr 21, 2012·Environmental Science & Technology·Kyle J ZarzanaMargaret A Tolbert
Jan 31, 2012·Physical Chemistry Chemical Physics : PCCP·Rachael E H MilesJonathan P Reid
Dec 19, 2009·Proceedings of the National Academy of Sciences of the United States of America·Gabriella AdlerYinon Rudich
Aug 9, 2008·Science·Duncan T L AlexanderJames R Anderson
Dec 4, 2013·Proceedings of the National Academy of Sciences of the United States of America·Gabriela AdlerYinon Rudich
Jun 7, 2014·Analytical Chemistry·Joseph R WiegandGeoffrey D Smith
Feb 1, 2012·The Journal of Physical Chemistry. a·Miri TrainicYinon Rudich
Aug 4, 2012·The Journal of Physical Chemistry. a·Bernard J MasonAndrew J Orr-Ewing
May 16, 2013·The Journal of Physical Chemistry Letters·Jim S WalkerJonathan P Reid
Sep 4, 2009·Physical Chemistry Chemical Physics : PCCP·J Michel FloresYinon Rudich
Apr 2, 2010·Physical Chemistry Chemical Physics : PCCP·Rachael E H MilesJonathan P Reid
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Jun 13, 2015·Journal of the American Chemical Society·Hongbo FuChristian George
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Dec 1, 2018·Environmental Science & Technology·Wilmarie Marrero-OrtizRenyi Zhang
Feb 21, 2018·Environmental Science & Technology·Quanfu HeYinon Rudich

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