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State of Mixing, Shape Factor, Number Size Distribution, and Hygroscopic Growth of the Saharan Anthropogenic and Mineral Dust Aerosol at Tinfou, Morocco

Kaaden, Nicole and Massling, Andreas and Schladitz, Alexander and Müller, Thomas and Kandler, Konrad and Schütz, Lothar and Weinzierl, Bernadett and Petzold, Andreas and Tesche, Matthias and Leinert, Stefan and Wiedensohler, Alfred (2009) State of Mixing, Shape Factor, Number Size Distribution, and Hygroscopic Growth of the Saharan Anthropogenic and Mineral Dust Aerosol at Tinfou, Morocco. Tellus B - Chemical and Physical Meteorology, 61B, pp. 51-63. DOI: 10.1111/j.1600-0889.2008.00388.x.

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Official URL: http://www3.interscience.wiley.com/journal/118533053/home

Abstract

The Saharan Mineral Dust Experiment (SAMUM) was conducted in May and June 2006 in Tinfou, Morocco. A H-TDMA system and a H-DMA-APS system were used to obtain hygroscopic properties of mineral dust particles at 85% RH. Dynamic shape factors of 1.11, 1.19 and 1.25 were determined for the volume equivalent diameters 720, 840 and 960 nm, respectively. During a dust event, the hydrophobic number fraction of 250 and 350 nm particles increased significantly from 30 and 65% to 53 and 75%, respectively, indicating that mineral dust particles can be as small as 200 nm in diameter. Log-normal functions for mineral dust number size distributions were obtained from total particle number size distributions and fractions of hydrophobic particles. The geometric mean diameter for Saharan dust particles was 715 nm during the dust event and 570 nm for the Saharan background aerosol. Measurements of hygroscopic growth showed that the Saharan aerosol consists of an anthropogenic fraction (predominantly non natural sulfate and carbonaceous particles) and of mineral dust particles. Hygroscopic growth and hysteresis curve measurements of the �more� hygroscopic particle fraction indicated ammonium sulfate as a main component of the anthropogenic aerosol. Particles larger than 720 nm in diameter were completely hydrophobic meaning that mineral dust particles are not hygroscopic.

Document Type:Article
Title:State of Mixing, Shape Factor, Number Size Distribution, and Hygroscopic Growth of the Saharan Anthropogenic and Mineral Dust Aerosol at Tinfou, Morocco
Authors:
AuthorsInstitution or Email of Authors
Kaaden, NicoleLeibniz Institute for Tropospheric Research, Leipzig
Massling, AndreasAarhus Univ., Aarhus, DK
Schladitz, AlexanderLeibniz Institute for Tropospheric Research, Leipzig
Müller, ThomasLeibniz Institute for Tropospheric Research, Leipzig
Kandler, KonradDarmstadt Univ. of Technology, Darmstadt
Schütz, LotharJohannes-Gutenberg-Univ., Mainz
Weinzierl, BernadettUNSPECIFIED
Petzold, AndreasUNSPECIFIED
Tesche, MatthiasLeibniz Institute for Tropospheric Research, Leipzig
Leinert, StefanEnvironmental Protection Agency, Richview, Dublin
Wiedensohler, AlfredLeibniz Institute for Tropospheric Research, Leipzig
Date:2009
Journal or Publication Title:Tellus B - Chemical and Physical Meteorology
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:61B
DOI:10.1111/j.1600-0889.2008.00388.x
Page Range:pp. 51-63
Status:Published
Keywords:SAMUM; aerosol; hygroscopicity; state of mixing
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Bernadett Weinzierl
Deposited On:04 Aug 2008
Last Modified:12 Dec 2013 20:32

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