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The Effect of Organic Compounds on the Growth Rate of Cloud Droplets in Marine and Forest Settings : Volume 8, Issue 19 (13/10/2008)

By Shantz, N. C.

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Book Id: WPLBN0003974864
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: The Effect of Organic Compounds on the Growth Rate of Cloud Droplets in Marine and Forest Settings : Volume 8, Issue 19 (13/10/2008)  
Author: Shantz, N. C.
Volume: Vol. 8, Issue 19
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Mozurkewich, M., Phinney, L., Leaitch, W. R., Shantz, N. C., & Toom-Sauntry, D. (2008). The Effect of Organic Compounds on the Growth Rate of Cloud Droplets in Marine and Forest Settings : Volume 8, Issue 19 (13/10/2008). Retrieved from http://www.ebooklibrary.org/


Description
Description: Department of Chemistry, University of Toronto, Toronto, Ontario, Canada. Organic matter represents an important fraction of the fine particle aerosol, yet our knowledge of the roles of organics in the activation of aerosol particles into cloud droplets is poor. A cloud condensation nucleus (CCN) counter is used to examine the relative growth rates of cloud droplets for case studies from field measurements on the North Pacific Ocean and in a coniferous forest. A model of the condensational growth of water droplets, on particles dissolving according to their solubility in water, is used to simulate the initial scattering of the droplets as they grow in the CCN counter. Simulations of the growth rates of fine particles sampled in the marine boundary layer of the North Pacific Ocean shows no evidence of natural marine organic material contributing to the CCN water uptake but there is an indication of an influence from organics from diesel ship emissions on the size distribution of sulphate and the ability of these particles to act as CCN. Simulations of the observations of water uptake on biogenic organic aerosol particles sampled in a coniferous forest indicate an impact of the organic on the water uptake rates, but one that is still smaller than that of pure sulphate. The existence of organics becomes important in determining the water uptake as the organic mass increases relative to sulphate. The values of the organic component of the hygroscopicity parameter κ that describes the CCN activity were found to be negligible for the marine particles and 0.02–0.05 for the forest particles.

Summary
The effect of organic compounds on the growth rate of cloud droplets in marine and forest settings

Excerpt
Abbatt, J. P. D., Broekhuizen, K., and Kumar, P. P.: Cloud condensation nucleus activity of internally mixed ammonium sulfate/organic acid aerosol particles, Atmos. Environ., 39, 4767–4778, 2005.; Abdul-Razzak, H. and Ghan, S. J.: Influence of slightly soluble organics on aerosol activation, J. Geophys. Res.-Atmos., 110, D06206, doi:10.1029/2004JD005324, 2005.; Aklilu, Y. A. and Mozurkewich, M.: Determination of external and internal mixing of organic and inorganic aerosol components from hygroscopic properties of submicrometer particles during a field study in the Lower Fraser Valley, Aerosol Sci. Technol., 38, 140–154, 2004.; Alfarra, M. R., Coe, H., Allan, J. D., Bower, K. N., Boudries, H., Canagaratna, M. R., Jimenez, J. L., Jayne, J. T., Garforth, A. A., Li, S. M., and Worsnop, D. R.: Characterization of urban and rural organic particulate in the Lower Fraser Valley using two Aerodyne Aerosol Mass Spectrometers, Atmos. Environ., 38, 5745–5758, 2004.; Allan, J. D., Alfarra, M. R., Bower, K. N., Williams, P. I., Gallagher, M. W., Jimenez, J. L., McDonald, A. G., Nemitz, E., Canagaratna, M. R., Jayne, J. T., Coe, H., and Worsnop, D. R.: Quantitative sampling using an Aerodyne aerosol mass spectrometer – 2. Measurements of fine particulate chemical composition in two U.K. cities, J. Geophys. Res.-Atmos., 108, 4091, doi:10.1029/2002JD002359, 2003a.; Allan, J. D., Jimenez, J. L., Williams, P. I., Alfarra, M. R., Bower, K. N., Jayne, J. T., Coe, H., and Worsnop, D. R.: Quantitative sampling using an Aerodyne aerosol mass spectrometer – 1. Techniques of data interpretation and error analysis, J. Geophys. Res.-Atmos., 108, 4090, doi:10.1029/2002JD002358, 2003b.; Alves, C., Pio, C., and Duarte, A.: Composition of extractable organic matter of air particles from rural and urban Portuguese areas, Atmos. Environ., 35, 5485–5496, 2001.; Anttila, T. and Kerminen, V. M.: Influence of organic compounds on the cloud droplet activation: A model investigation considering the volatility, water solubility, and surface activity of organic matter, J. Geophys. Res.-Atmos., 107, 4662, doi:10.1029/2001JD001482, 2002.; Asa-Awuku, A. and Nenes, A.: Effect of solute dissolution kinetics on cloud droplet formation: Extended Köhler theory, J. Geophys. Res.-Atmos., 112, D22201, doi:10.1029/2005JD006934, 2007.; Bilde, M. and Svenningsson, B.: CCN activation of slightly soluble organics: the importance of small amounts of inorganic salt and particle phase, Tellus B, 56, 128–134, 2004.; Broekhuizen, K., Kumar, P. P., and Abbatt, J. P. D.: Partially soluble organics as cloud condensation nuclei: Role of trace soluble and surface active species, Geophys. Res. Lett., 31, L01107, doi:10.1029/2003GL018203, 2004.; Broekhuizen, K., Chang, R.Y.-W., Leaitch, W. R., Li, S.-M., and Abbatt, J. P. D.: Closure between measured and modeled cloud condensation nuclei (CCN) using size-resolved aerosol compositions in downtown Toronto, Atmos. Chem. Phys., 6, 2513–2524, 2006.; Cantrell, W., Shaw, G., Cass, G. R., Chowdhury, Z., Hughes, L. S., Prather, K. A., Guazzotti, S. A., and Coffee, K. R.: Closure between aerosol particles and cloud condensation nuclei at Kaashidhoo Climate Observatory, J. Geophys. Res.-Atmos., 106, 28 711–28 718, 2001.; Carvalho, A., Pio, C., and Santos, C.: Water-soluble hydroxylated organic compounds in German and Finnish aerosols, Atmos. Environ., 37, 1775–1783, 2003.; Chan, M. N., Kreidenweis, S. M., and Chan, C. K.: Measurements of the hygroscopic and deliquescence properties of organic compounds of different solubilities in water and their relationship with cloud condensation nuclei activities, Environ. Sci. Technol., 42, 3602–3608, 2008.; Chang, R. Y. W., Liu, P. S. K., Leaitch, W. R., and Abbatt, J. P. D.: Comparison between measured and predicted CCN concentrations at Egbert, Ontario: Focus on the organic aerosol fraction at a semi-rural site, Atmos. Environ., 41, 8172–8182, 2007.; Cheng, Y., Li, S. M., Leithead, A., Brickell, P. C., and Leaitc

 

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