Hydrophilic properties of aged soot

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Read Full Article (file size: 129424 bytes) Cited by GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L01807, doi:10.1029/2004GL021496, 2005 Hydrophilic properties of aged soot Bilal Zuberi Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Kirsten S. Johnson Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Gretchen K. Aleks Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Luisa T. Molina Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Mario J. Molina Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Alexander Laskin William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington, USA Abstract The global presence of soot has significant effects on regional and global climate, as well as human health. Influence of soot on radiation budget, rain formation and heterogeneous chemistry, and its residence time in the atmosphere are largely dependent on its ability to interact with water. While freshly emitted soot is extremely hydrophobic, oxidation during aging causes soot to become more hydrophilic. Laboratory studies demonstrate that aged soot attracts and retains water, and can be efficiently removed from the troposphere by entrapment in existing liquid cloud droplets or by activation as cloud condensation nuclei. Received 14 September 2004; accepted 6 December 2004; published 8 January 2005. Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801, 4906); 0320 Atmospheric Composition and Structure: Cloud physics and chemistry; 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry; 0394 Atmospheric Composition and Structure: Instruments and techniques; 1610 Global Change: Atmosphere (0315, 0325). Read Full Article (file size: 129424 bytes) Cited by Citation: Zuberi, B., K. S. Johnson, G. K. Aleks, L. T. Molina, M. J. Molina, and A. Laskin (2005), Hydrophilic properties of aged soot, Geophys. Res. Lett., 32, L01807, doi:10.1029/2004GL021496. Copyright 2005 by the American Geophysical Union.

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