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Measured and Modeled Humidification Factors of Fresh Smoke Particles from Biomass Burning: Role of Inorganic Constituents : Volume 10, Issue 2 (12/02/2010)

By Hand, J. L.

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Book Id: WPLBN0003986601
Format Type: PDF Article :
File Size: Pages 45
Reproduction Date: 2015

Title: Measured and Modeled Humidification Factors of Fresh Smoke Particles from Biomass Burning: Role of Inorganic Constituents : Volume 10, Issue 2 (12/02/2010)  
Author: Hand, J. L.
Volume: Vol. 10, Issue 2
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Mcmeeking, G. M., Kreidenweis, S. M., T. Levi, E. J., Hand, J. L., Carrico, C. M., Desyaterik, Y.,...Day, D. E. (2010). Measured and Modeled Humidification Factors of Fresh Smoke Particles from Biomass Burning: Role of Inorganic Constituents : Volume 10, Issue 2 (12/02/2010). Retrieved from http://ebooklibrary.org/


Description
Description: Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, USA. During the 2006 FLAME study (Fire Laboratory at Missoula Experiment), laboratory burns of biomass fuels were performed to investigate the physico-chemical, optical, and hygroscopic properties of fresh biomass smoke. As part of the experiment, two nephelometers simultaneously measured dry and humidified light scattering coefficients (bsp(dry) and bsp(RH), respectively) in order to explore the role of relative humidity (RH) on the optical properties of biomass smoke aerosols. Results from burns of several biomass fuels showed large variability in the humidification factor (f(RH)=bsp(RH)/bsp(dry)). Values of f(RH) at RH=85–90% ranged from 1.02 to 2.15 depending on fuel type. We incorporated measured chemical composition and size distribution data to model the smoke hygroscopic growth to investigate the role of inorganic and organic compounds on water uptake for these aerosols. By assuming only inorganic constituents were hygroscopic, we were able to model the water uptake within experimental uncertainty, suggesting that inorganic species were responsible for most of the hygroscopic growth. In addition, humidification factors at 85–90% RH increased for smoke with increasing inorganic salt to carbon ratios. Particle morphology as observed from scanning electron microscopy revealed that samples of hygroscopic particles contained soot chains either internally or externally mixed with inorganic potassium salts, while samples of weak to non-hygroscopic particles were dominated by soot and organic constituents. This study provides further understanding of the compounds responsible for water uptake by young biomass smoke, and is important for accurately assessing the role of smoke in climate change studies and visibility regulatory efforts.

Summary
Measured and modeled humidification factors of fresh smoke particles from biomass burning: role of inorganic constituents

Excerpt
Anderson, T. L., Covert, D. S., Marshall, S. F., Laucks, M. L., Charlson, R. J., Waggoner, A. P., Ogren, J. A., Caldow, R., Holm, R. L., Quant, F. R., Sem, G. J., Wiedensohler, A., Ahlquist, N. A., and Bates, T. S.: Performance characteristics of a high-sensitivity, three-wavelength, total scatter/backscatter nephelometer, J. Atmos. Oceanic Technol., 13, 967–986, 1996.; Baron, P. A. and Willeke, K.: Gas and Particle Motion, in: Aerosol Measurement Principles, Techniques and Applications, edited by: Willeke, K. and Baron, P., Van Nostrand Reinhold, New York, pp. 23–40, 1993.; Baynard, T., Garland, R. M., Ravishankara, A. R., Tolbert, M. A., and Lovejoy, E. R.: Key factors influencing the relative humidity dependance of aerosol light scattering, Geophys. Res. Letts., 33, L06813, doi:10.1029/2005JL024898, 2006.; Carrico, C. M., Kreidenweis, S. M., Malm, W. C., Day, D. E., Lee, T., Carrillo, J., McMeeking, G. R., and Collett Jr., J. L.: Hygroscopic growth behavior of a carbon-dominated aerosol in Yosemite National Park, Atmos. Environ., 39, 1393–1404, 2005.; Carrico, C. M., Petters, M. D., Kreidenweis, S. M., Collett Jr., J. L., Engling, G., and Malm, W. C.: Aerosol hygroscopicity and cloud droplet activation of extracts of filters from biomass burning experiments, J. Geophys. Res., 113, D08206, doi:10.1029/2007JD009274, 2008.; Carrico, C. M., Petters, M. D., Kreidenweis, S. M., Sullivan, A. P., McMeeking, G. R., Levin, E. J. T., Malm, W. C., and Collett Jr., J. L.: Water uptake and chemical composition of fresh aerosols generated in open burning of biomass, Atmos. Chem. Phys. Discuss., 10, 3627–3658, 2010.; Chakrabarty, R. K., Moosmuller, H., Garro, M. A., Arnott, W. P., Walker, J., Susott, R. A., Babbitt, R. E., Wold, C. E., Lincoln, E. N., and Hao, W. M.: Emissions from the laboratory combustion of wildland fuels: Particle morphology and size, J. Geophys. Res., 111, D07204, doi:10.1029/2005JD006659, 2006.; Chen, L.-W. A., Moosmüller, H., Arnott, W. P., Chow, J. C., Watson, J. G., Susott, R. A., Babbitt, R. E., Wold, C. E., Lincoln, E. N., and Hao, W. M.: Particles emissions from laboratory combustion of wildland fuels: In-situ optical and mass measurements, Geophys. Res. Lett., 33, L04803, doi:10.1029/2005GL024838, 2006.; Chen, L.-W. A., Moosmüller, H., Arnott, W. P., Chow, J. C., and Watson, J. G.: Emissions from laboratory combustion of wildland fuels: Emission factors and source profiles, Environ. Sci. Technol., 41(12), 4317–4325, 2007.; Chow, J. C., Watson, J. G., Chen, L.-W. A., Chang, M. C. O., Robinson, N. F., Trimble, D., and Kohl, S.: The IMPROVE{_}A temperature protocol for thermal/optical carbon analysis: Maintaining consistency with a long-term database, J. Air Waste Manage. Assoc. 57, 1014–1023, 2007.; Clegg, S. L., Brimblecombe, P., and Wexler, A. S.: A thermodynamic model of the system H+ - NH4+ - Na+ - SO42- - NO3- - Cl- - H2O at 298.15 K, J. Phys. Chem. A, 102, 2155–2171, 1998.; Day, D. E., Malm, W. C., and Kreidenweis, S. M.: Aerosol light scattering measurements as a function of relative humidity, J. Air Waste Manage. Assoc., 50, 710–716, 2000.; Day, D. E., Hand, J. L., Carrico, C. M., Engling, G., and Malm, W. C.: Humidification factors from laboratory studies of fresh smoke from biomass fuels, J. Geophys. Res., 111, D22202, doi:10.1029/2006JD007221, 2006.; DeMott, P. J., Petters, M. D., Prenni, A. J., Carrico, C. M., Kreidenweis, S. M., Collett Jr., J. L., and Moosmüller, H.: Ice nucleation behavior of biomass combustion particles at cirrus temperatures, J. Geophys. Res., 114, D16205, doi:10.1029/2009JD012036, 2009.; Dick, W. D., Saxena, P., and McMurry, P. H.: Estimation of water uptake by organic compounds in submicron aerosols measured during the Southeastern Aerosol and Visibility Study, J. Geophys. Res., 105, 1471–1479, 2000.; El-Zanan, H. S., Lowenthal, D. H., Ziel

 

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