INFLUENCE OF URBAN CANYONS OVER MICROMETEOROLOGICAL VARIABLES IN THE MEDIEVAL ITALIAN CITY OF BOLOGNA

A prototypical instrumental array was deployed in two of Bologna's
medieval city centre urban canyons (Strada Maggiore and Via Guerrazzi)
to analyse a set of micrometeorological variables and particulate matter
trends via handheld optical particle counters. The measurements aimed
to characterize the local microenvironment and understand how it was tied
to the canyons' features and orientation. The canyons' features have an effect
over the radiative-thermal environment and the local stability of the surface
layer, but particulate matter trends are driven by different forcings and
do not show strong relationships with the local micrometeorology.