ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-9-21561-2009 Water-soluble atmospheric HULIS in urban environments Baduel C. 1 Voisin D. 1 Jaffrezo J.-L. 1 Université Joseph Fourier – Grenoble 1/CNRS – INSU, Laboratoire de Glaciologie et Géophysique de l'Environnement, rue Molière, 38402 Saint-Martin-d'Hères, France 14 10 2009 9 5 21561 21579 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/9/21561/2009/acpd-9-21561-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/9/21561/2009/acpd-9-21561-2009.pdf

Major contributors to the organic aerosol include water-soluble macromolecular compounds (e.g. HULIS<sub>WS</sub>). The nature and sources of HULIS<sub>WS</sub>are still largely unknown. This work is based on a monitoring in six different French cities performed during summer and winter seasons. HULIS<sub>WS</sub> analysis was performed with a selective method of extraction complemented by carbon quantification. UV spectroscopy was also applied for their chemical characterisation. Strong differences in the optical properties and therefore in the chemical structure (i.e. the aromaticity) between HULIS<sub>WS</sub> from samples of summer- and wintertime are found. These differences highlight different processes responsible for emissions and formation of HULIS<sub>WS</sub> according to the season. Specific absorbance can also be considered as a rapid and useful indicator of the origin of HULIS<sub>WS</sub> in urban environment.

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