Urban Aerosol Particle Size Characterization in Eastern Mediterranean Conditions

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http://hdl.handle.net/10138/310869

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Hussein , T , Dada , L , Hakala , S , Petaja , T & Kulmala , M 2019 , ' Urban Aerosol Particle Size Characterization in Eastern Mediterranean Conditions ' , Atmosphere , vol. 10 , no. 11 , 710 . https://doi.org/10.3390/atmos10110710

Title: Urban Aerosol Particle Size Characterization in Eastern Mediterranean Conditions
Author: Hussein, Tareq; Dada, Lubna; Hakala, Simo; Petaja, Tuukka; Kulmala, Markku
Contributor: University of Helsinki, Air quality research group
University of Helsinki, Air quality research group
University of Helsinki, Air quality research group
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2019-11
Language: eng
Number of pages: 21
Belongs to series: Atmosphere
ISSN: 2073-4433
URI: http://hdl.handle.net/10138/310869
Abstract: Characterization of urban particle number size distribution (PNSD) has been rarely reported/performed in the Middle East. Therefore, we aimed at characterizing the PNSD (0.01-10 mu m) in Amman as an example for an urban Middle Eastern environment. The daily mean submicron particle number concentration (PNSub) was 6.5 x 10(3)-7.7 x 10(4) cm(-3) and the monthly mean coarse mode particle number concentration (PNCoarse) was 0.9-3.8 cm(-3) and both had distinguished seasonal variation. The PNSub also had a clear diurnal and weekly cycle with higher concentrations on workdays (Sunday-Thursday; over 3.3 x 10(4) cm(-3)) than on weekends (below 2.7 x 10(4) cm(-3)). The PNSub constitute of 93% ultrafine fraction (diameter <100 nm). The mean particle number size distributions was characterized with four well-separated submicron modes (D-pg,D-I, N-i): nucleation (22 nm, 9.4 x 10(3) cm(-3)), Aitken (62 nm, 3.9 x 10(3) cm(-3)), accumulation (225 nm, 158 cm(-3)), and coarse (2.23 mu m, 1.2 cm(-3)) in addition to a mode with small geometric mean diameter (GMD) that represented the early stage of new particle formation (NPF) events. The wind speed and temperature had major impacts on the concentrations. The PNCoarse had a U-shape with respect to wind speed and PNSub decreased with wind speed. The effect of temperature and relative humidity was complex and require further investigations.
Subject: submicron
coarse
modal structure
meteorological effect
particle number size distribution
seasonal
diurnal
CHARACTERIZING MINERAL DUSTS
COASTAL CITY JEDDAH
BLACK CARBON
NUMBER CONCENTRATIONS
AIR-POLLUTION
BACKGROUND ATMOSPHERE
ULTRAFINE PARTICLES
PARTICULATE MATTER
TRANSPORT MICROENVIRONMENTS
PHYSICAL-CHARACTERISTICS
114 Physical sciences
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