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Secondary effects of urban heat island mitigation measures on air quality

Fallmann, J.; Forkel, R.; Emeis, S.

Abstract:
This study presents numerical simulations analysing the effect of urban heat island (UHI) mitigation measures on the chemical composition of the urban atmosphere. The mesoscale chemical transport model WRF-Chem is used to investigate the impact of urban greening and highly reflective surfaces on the concentrations of primary (CO, NO) as well as secondary pollutants (O$_{3}$) inside the urban canopy. In order to account for the sub-grid scale heterogeneity of urban areas, a multi-layer urban canopy model is coupled to WRF-Chem. Using this canopy model at its full extend requires the introduction of several urban land use classes in WRF-Chem. The urban area of Stuttgart serves as a test bed for the modelling of a case scenario of the 2003 European Heat Wave. The selected mitigation measures are able to reduce the urban temperature by about 1 K and the mean ozone concentration by 5–8%. Model results however document also negative secondary effects on urban air quality, which are closely related to a decrease of vertical mixing in the urban boundary layer. An increase of primary pollutants NO and CO by 5–25% can be observed. In addition, highly reflective surfaces can increase peak ozone concentration by up to 12% due to a high intensity of reflected shortwave radiation accelerating photochemical reactions.

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Verlagsausgabe §
DOI: 10.5445/IR/1000053487
Veröffentlicht am 26.10.2020
Originalveröffentlichung
DOI: 10.1016/j.atmosenv.2015.10.094
Scopus
Zitationen: 75
Web of Science
Zitationen: 65
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 0960-1686, 1878-2124
KITopen-ID: 1000053487
HGF-Programm 12.02.04 (POF III, LK 01) Urban-Rural Interactions
Erschienen in Atmospheric environment / A
Verlag Elsevier
Band 125
Seiten 199-211
Nachgewiesen in Scopus
Web of Science
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