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Impact of urban imperviousness on boundary layer meteorology and air chemistry on a regional scale

Fallmann, Joachim; Barra, Marc; Kumar, Vinod; Tost, Holger

Abstract:

It has been long understood that land cover change from natural to impervious modifies the surface energy balance and hence the dynamical properties of the overlying atmosphere. The urban heat island is manifested in the formation of an urban boundary layer with distinct thermodynamic features that in turn govern transport processes of air pollutants. While many studies already demonstrated the benefits of urban canopy models (UCM) for atmospheric modelling, work on the impact on urban air chemistry is scarce. This study uses the state-of-the-art coupled chemistry-climate modelling system MECO(n) to assess the impact of the COSMO UCM TERRA_URB on the dynamics and gas phase chemistry in the boundary layer of the urban agglomeration Rhine-Main in Germany. Comparing the model results to ground observations and satellite and ground based remote sensing data, we found that the UCM experiment reduces the bias in temperature at the surface and throughout the boundary layer. This is true for ground level NO2 and ozone distribution as well. The application of MECO(n) for urban planning purposes is discussed by designing case studies representing two projected scenarios in future urban planning – densification of central urban areas and urban sprawl. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000136230
Veröffentlicht am 06.08.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Forschungsbereich Troposphäre (IMK-TRO)
Institut für Meteorologie und Klimaforschung (IMK)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2021
Sprache Englisch
Identifikator ISSN: 0941-2948
KITopen-ID: 1000136230
HGF-Programm 12.11.35 (POF IV, LK 01) Tailored information for users and stakeholders
Erschienen in Meteorologische Zeitschrift
Verlag Borntraeger Science Publishers
Band 30
Heft 4
Seiten 349–367
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 28.06.2021
Schlagwörter Urban air quality; urban planning; boundary layer; heat wave; regional scale; urban canopy; parametrization
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Web of Science
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