Reply on RC1 and RC2

Abstract

A new version of the street-network model, Model of Urban Network of Intersecting Canyons and Highways version 2.0 (MUNICH v2.0) is presented. The comprehensive aerosol model SSH-aerosol is implemented in MUNICH v2.0 to simulate the street concentrations of multi pollutants including secondary aerosols. The implementation uses the Application Programming Interface (API) technology so that the SSH-aerosol version may be easily updated. New parameterisations are also introduced in MUNICH v2.0, including a non-stationary approach to model reactive pollutants, particle deposition and resuspension, and a parameterisation of the wind at roof level. A test case over a Paris suburb is presented for model evaluation and illustration of the impact of the new functionalities. The implementation of SSH-aerosol leads to an increase of 11 % of PM10 concentration, because of secondary aerosol formation. Using the non-stationary approach rather than the stationary one leads to a decrease in NO2 concentration by 16 %. The impact of particle deposition and resuspension on pollutant concentrations in the street canyons is low.