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Influence of photochemical processes on traffic-related airborne pollutants in urban street canyon
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SYSNO ASEP 0467072 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Influence of photochemical processes on traffic-related airborne pollutants in urban street canyon Author(s) Střižík, Michal (UFCH-W)
Zelinger, Zdeněk (UFCH-W) RID, ORCID
Kubát, Pavel (UFCH-W) RID, ORCID, SAI
Civiš, Svatopluk (UFCH-W) RID, ORCID, SAI
Bestová, I. (CZ)
Nevrlý, Václav (UT-L) RID
Kadeřábek, P. (CZ)
Čadil, J. (CZ)
Berger, P. (CZ)
Černý, A. (CZ)
Engst, Pavel (UFCH-W)Source Title Journal of Atmospheric and Solar-Terrestrial Physics. - : Elsevier - ISSN 1364-6826
Roč. 147, SEP 2016 (2016), s. 1-10Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords remote sensing ; LIDAR ; Urban street canyon Subject RIV CF - Physical ; Theoretical Chemistry Subject RIV - cooperation Institute of Thermomechanics - Fluid Dynamics R&D Projects GA14-14696S GA ČR - Czech Science Foundation (CSF) LD14022 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFCH-W - RVO:61388955 ; UT-L - RVO:61388998 UT WOS 000382417500001 EID SCOPUS 84989949283 DOI 10.1016/j.jastp.2016.06.009 Annotation The urban street canyon of Legerova Street is part of the north-south trunk road that passes through the centre of Prague and remains an unresolved environmental issue for the capital of the Czech Republic. As many as one hundred thousand cars move through this region per day, and mortality has increased as a result of dust, NOx and other exhaust pollutants. The spatial distribution of pollutants (i.e., NO2, NO, and O-3) during a day was measured by combined DIAL/SODAR techniques and spot analyzers that were appropriately located near the bottom of the street canyon. The measurements were performed under different meteorological conditions (autumn versus summer period). A purely physical approach does not provide a true description of reality due to photochemical processes that take place in the street canyon atmosphere. Sunlight in the summer triggers the production of ozone and thereby influences the concentration of NO2. The formation of an inverse non-diffuse vertical concentration distribution of NO2 in the morning hours was found to be related to the direct emission of O-3 in the street and its background concentration. Rapid changes of NO2 concentrations were observed over time and in the vertical profile. An approach using a photochemical reactor to describe processes in a street canyon atmosphere was developed and verified as a useful tool for prediction purposes. (C) 2016 Elsevier Ltd. All rights reserved. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2017
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