Mažeikis, A.
Urbanization influence on meteorological parameters of air
pollution: Vilnius case study
This study concerns on spatial and temporal effects of
surface parameters on boundary layer meteorological fields in urban
territories. Selected parameters (2-metre temperature, precipitation amount and
intensity, wind speed) are important for evaluating air pollution dispersion.
Study is done using Enviro-HIRLAM numerical weather prediction model with the
modifications of surface parameters to reflect changes due to urbanization. The
modifications were made to parameters that are directly influenced by
urbanization: surface roughness, albedo and anthropogenic heat flux. Case study
consists of three different dates with different conditions and two different
modelling domains. Overall, nine simulation runs were done including the
control ones. Comparison of control and modified model runs was used for
evaluation of effects. Differences of wind speed and temperature between
control and modified runs were detected and in some cases, they reach up to 1.4
°C and 2.7 m/s. In addition, spatial differences in precipitation
meteorological field were observed.