Print Email Facebook Twitter Chemical composition and hygroscopic properties of aerosol particles over the Aegean Sea Title Chemical composition and hygroscopic properties of aerosol particles over the Aegean Sea Author Bezantakos, S. Barmpounis, K. Giamarelou, M. Bossioli, E. Tombrou, M. Mihalopoulos, N. Eleftheriadis, K. Kalogiros, J. Allan, J.D. Bacak, A. Percival, C.J. Coe, H. Biskos, G. Faculty Applied Sciences Department ChemE/Chemical Engineering Date 2013-11-29 Abstract The chemical composition and water uptake characteristics of sub-micrometre atmospheric particles over the region of the Aegean Sea were measured between 25 August and 11 September 2011 within the framework of the Aegean-Game campaign. High temporal-resolution measurements of the chemical composition of the particles were conducted using an airborne compact time-of-flight aerosol mass spectrometer (cToF-AMS). These measurements were performed during two flights from the island of Crete to the island of Lemnos and back. A hygroscopic tandem differential mobility analyser (HTDMA) located on the island of Lemnos was used to measure the ability of the particles to take up water. The HTDMA measurements showed that the particles in the dominant mode were internally mixed, having hygroscopic growth factors that ranged from 1.00 to 1.59 when exposed to 85% relative humidity. When the aircraft flew near the ground station on Lemnos, the cToF-AMS measurements showed that the organic volume fraction of the particles ranged from 43 to 56%. These measurements corroborate the range of hygroscopic growth factors measured by the HTDMA during that time. Good closure between HTDMA and cToF-AMS measurements was achieved when assuming that the organic species were less hygroscopic and had an average density that corresponds to aged organic species. Using the results from the closure study, the cToF-AMS measurements were employed to determine vertical profiles of a representative aerosol hygroscopic parameter ?mix. Calculated ?mix values ranged from 0.19 to 0.84 during the first flight and from 0.22 to 0.80 during the second flight. Air masses of different origin as determined by back trajectory calculations can explain the spatial variation in chemical composition and ?mix values of the particles observed in the region. To reference this document use: http://resolver.tudelft.nl/uuid:4f62ae3a-7176-4028-93f4-d4d845f30dc3 DOI https://doi.org/10.5194/acp-13-11595-2013 Publisher European Geosciences Union ISSN 1680-7316 Source http://www.atmos-chem-phys.net/13/11595/2013/ Source Atmospheric Chemistry and Physics, 12 (22), 2013 Part of collection Institutional Repository Document type journal article Rights © 2013 The Author(s)CC Attribution 3.0 License Files PDF Barmpounis_2013.pdf 4.48 MB Close viewer /islandora/object/uuid:4f62ae3a-7176-4028-93f4-d4d845f30dc3/datastream/OBJ/view