Seasonal and diurnal changes in inorganic ions, carbonaceous matter and mass in ambient aerosol particles in an urban, background area

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Timonen , H , Aurela , M , Carbone , S , Saarnio , K , Frey , A , Saarikoski , S , Teinilä , K , Kulmala , M & Hillamo , R 2014 , ' Seasonal and diurnal changes in inorganic ions, carbonaceous matter and mass in ambient aerosol particles in an urban, background area ' Boreal Environment Research , vol. 19 , no. Suppl. B , pp. 71-86 .

Title: Seasonal and diurnal changes in inorganic ions, carbonaceous matter and mass in ambient aerosol particles in an urban, background area
Author: Timonen, Hilkka; Aurela, Minna; Carbone, Samara; Saarnio, Karri; Frey, Anna; Saarikoski, Sanna; Teinilä, Kimmo; Kulmala, Markku; Hillamo, Risto
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research
Date: 2014-09-30
Language: eng
Number of pages: 16
Belongs to series: Boreal Environment Research
ISSN: 1239-6095
URI: http://hdl.handle.net/10138/160095
Abstract: Concentration and composition of the fine particulate matter (PM) was measured using various online methods for 13 months in an urban, background area in Helsinki, Finland. Seasonal differences were found for ions and carbonaceous compounds. Biomass burning was found to increase inorganic ion and elemental carbon (EC) concentrations in winter, whereas organic carbon (OC) contribution was highest during summer due to secondary aerosol formation. Diurnal cycles, with maxima between 06:00 and 09:00, were recorded for EC and nitrate due to traffic emissions. In addition, the concentrations measured with the online and offline PM sampling devices were compared using regression analysis. In general, a good agreement (r(2) = 0.60-0.95) was found. During the year-long measurements, on average 65% of PM2.5 was identified by submicron chemical analyses (ions, OC, EC). As compared with filter measurements, the high resolution measurements provided important data on short pollution plumes and diurnal changes.
Subject: FINE PARTICULATE MATTER
INTO-LIQUID SAMPLER
CHEMICAL-COMPOSITION
ELEMENTAL CARBON
AIR-POLLUTION
BLACK CARBON
LONG-RANGE
AIRBORNE MEASUREMENTS
SIZE DISTRIBUTIONS
ORGANIC-CARBON
1172 Environmental sciences
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