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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-48
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-48
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 19 Feb 2019

Model description paper | 19 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

CALIOPE-Urban v1.0: Coupling R-LINE with a mesoscale air quality modelling system for urban air quality forecasts over Barcelona city (Spain)

Jaime Benavides1, Michelle Snyder2, Marc Guevara1, Albert Soret1, Carlos Pérez García-Pando1, Fulvio Amato3, Xavier Querol3, and Oriol Jorba1 Jaime Benavides et al.
  • 1Barcelona Supercomputing Center, Spain
  • 2Institute for the Environment, University of North Carolina at Chapel Hill, USA
  • 3Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Spain

Abstract. The NO2 annual air quality limit value is systematically exceeded in many European cities. In this context, understanding human exposure, improving policy and planning, and providing forecasts requires the development of accurate air quality models at urban (street–level) scale. We describe CALIOPE-Urban, a system coupling CALIOPE – an operational mesoscale air quality forecast system based on HERMES (emissions), WRF (meteorology) and CMAQ (chemistry) models – with the urban roadway dispersion model R-LINE. Our developments have focused on Barcelona city (Spain), but the methodology may be replicated for other cities in the future. WRF drives pollutant dispersion and CMAQ provides background concentrations to R-LINE. Key features of our system include the adaptation of R-LINE to street canyons, the use of a new methodology that considers upwind grid cells in CMAQ to avoid double counting traffic emissions, a new method to estimate local surface roughness within street canyons, and a vertical mixing parametrization that considers urban geometry and atmospheric stability to calculate surface level background concentrations. We show that the latter is critical to correct the nighttime overestimations in our system. Both CALIOPE and CALIOPE-Urban are evaluated using two sets of observations. The temporal variability is evaluated against measurements from five traffic sites and one urban background site for April–May 2013. While both systems show a fairly good agreement at the urban background site, CALIOPE-Urban shows a better agreement in traffic sites. The spatial variability is evaluated using 182 passive dosimeters that were distributed across Barcelona during two weeks for February–March 2017. In this case, also the coupled system shows a more realistic distribution than the mesoscale system, which systematically underpredicts NO2 close to traffic emission sources. Overall CALIOPE-Urban improves mesoscale model results, demonstrating that the combination of both scales provides a more realistic representation of NO2 spatio-temporal variability in Barcelona.

Jaime Benavides et al.
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Jaime Benavides et al.
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