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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 und Massling, Andreas und Schladitz, Alexander und Müller, Thomas und Kandler, Konrad und Schütz, Lothar und Weinzierl, Bernadett und Petzold, Andreas und Tesche, Matthias und Leinert, Stefan und 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, Seiten 51-63. DOI: 10.1111/j.1600-0889.2008.00388.x.

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:State of Mixing, Shape Factor, Number Size Distribution, and Hygroscopic Growth of the Saharan Anthropogenic and Mineral Dust Aerosol at Tinfou, Morocco
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
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, BernadettNICHT SPEZIFIZIERT
Petzold, AndreasNICHT SPEZIFIZIERT
Tesche, MatthiasLeibniz Institute for Tropospheric Research, Leipzig
Leinert, StefanEnvironmental Protection Agency, Richview, Dublin
Wiedensohler, AlfredLeibniz Institute for Tropospheric Research, Leipzig
Datum:2009
Erschienen in:Tellus B - Chemical and Physical Meteorology
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:61B
DOI :10.1111/j.1600-0889.2008.00388.x
Seitenbereich:Seiten 51-63
Status:veröffentlicht
Stichwörter:SAMUM; aerosol; hygroscopicity; state of mixing
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W - keine Zuordnung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):W -- keine Zuordnung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Dr.rer.nat. Bernadett Weinzierl
Hinterlegt am:04 Aug 2008
Letzte Änderung:12 Dez 2013 20:32

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