ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-11-14455-2011 Aging fingerprints in combustion particles Zelenay V. 1 Mooser R. 2 5 Tritscher T. 3 Křepelová A. 1 Heringa M. F. 3 Chirico R. 3 6 Prévôt A. S. H. 3 Weingartner E. 3 Baltensperger U. 3 Dommen J. 3 Watts B. 4 Raabe J. 4 Huthwelker T. 4 Ammann M. 1 Laboratory of Radiochemistry and Environmental Chemistry, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland EMPA, Swiss Federal Laboratories for Materials Research and Testing, Electronics/Metrology Laboratory, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland Laboratory of Atmospheric Chemistry, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland now at: swissQuant Group AG, Kuttelgasse 7, 8001 Zurich, Switzerland now at: Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), UTAPRAD-DIM, Via E. Fermi 45, 00044 Frascati, Italy 11 05 2011 11 5 14455 14493 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/11/14455/2011/acpd-11-14455-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/11/14455/2011/acpd-11-14455-2011.pdf

Soot particles can significantly influence the Earth's climate by absorbing and scattering solar radiation as well as by acting as cloud condensation nuclei. However, despite their environmental (as well as economic and political) importance, the way these properties are affected by atmospheric processing is still a subject of discussion. In this work, soot particles emitted from two different cars, a EURO 2 transporter, a EURO 3 passenger vehicle, and a wood stove were investigated on a single-particle basis. The emitted exhaust, including the particulate and the gas phase, was processed in a smog chamber with artificial solar radiation. Single particle specimens of both unprocessed and aged soot were characterized using x-ray absorption spectroscopy and scanning electron microscopy. Comparison of the spectra from the unprocessed and aged soot particles revealed changes in the carbon functional group content, such as that of carboxylic carbon, which can be ascribed to both the condensation of secondary organic compounds on the soot particles and oxidation of primary soot particles upon photochemical aging. Changes in the morphology and size of the single soot particles were also observed upon aging. Furthermore, we show that the soot particles take up water in humid environments and that their water uptake capacity increases with photochemical aging.

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