Author:
Dinar E.,Mentel T. F.,Rudich Y.
Abstract
Abstract. Atmospheric aerosols play significant roles in climatic related phenomena. Size, density and shape of particles affect their fluid-dynamic parameters which in turn dictate their transport and lifecycle. Moreover, density and shape are also related to particles' optical properties, influencing their regional and global radiative effects. In the present study we have measured and compared the effective densities of humic like substances (HULIS) extracted from smoke and pollution aerosol particles to those of molecular weight-fractionated aquatic and terrestrial Humic Substances (HS). The effective density was measured by comparing the electro mobility and vacuum aerodynamic diameter of aerosol particles composed of these compounds. Characterization of chemical parameters such as molecular weight, aromaticity and elemental composition allow us to test how they affect the effective density of these important environmental macromolecules. It is suggested that atmospheric aging processes increase the effective density of HULIS due to oxidation, while packing due to the aromatic moieties plays important role in determining the density of the aquatic HS substances.
Reference73 articles.
1. Abdul-Razzak, H. and Ghan, S. J.: Parameterization of the influence of organic surfactants on aerosol activation, J. Geophys. Res., 109, D03205, https://doi.org/03210.01029/02003JD004043, 2004.
2. Azriel, R. and Gazit, E.: Analysis of the structural and functional elements of the minimal active fragment of islet amyloid polypeptide (iapp) – an experimental support for the key role of the phenylalanine residue in amyloid formation, J. Biol. Chem., 276, 34 156–34 161, 2001.
3. Badger, C. L., George, I., Griffiths, P. T., Braban, C. F., Cox, R. A., and Abbatt, J. P. D.: Phase transitions and hygroscopic growth of aerosol particles containing humic acid and mixtures of humic acid and ammonium sulphate, Atmos. Chem. Phys., 6, 755–768, 2006.
4. Benedetti, M. F., vanRiemsdik, W. H., and Koopal, L. K.: Humic substances considered as a heterogeneous donnan gel phase, Environ. Sci. Technol., 30, 1805–1813, 1996.
5. Brooks, S. D., DeMott, P. J., and Kreidenweis, S. M.: Water uptake by particles containing humic materials and mixtures of humic materials with ammonium sulfate, Atmos. Environ., 38, 1859–1868, 2004.
Cited by
143 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献