What is the FMI ?
Air quality research at the FMI.
January 3rd 2003
Urban pollution meteorology is characterised by a number of
fundamental parameters and their evolution in time, which all have specific
problems as to their monitoring, representativeness, parameterisation and
Within COST-715, WG2 addresses the specific problems in describing the surface
energy balance and the mixing height. The surface energy balance and the surface
temperature and heat fluxes determine the hydrostatic stability conditions in
the lower atmosphere and regulate its strength for mixing pollutants, the mixing
height parameter determines the available volume for pollutants mixing.
The activities of WG2:
- To review theoretical concepts of the structure of the urban boundary
- To review and assess pre-processors, schemes and models for determining
the mixing height, the surface energy budget and the stability that are
available to the participants. Cases of strong stability and/or windless
conditions are of special interest.
- To review theoretical models together with available field measurements
and LES for calculation of the minimum friction velocity and the
heat transfer coefficient. Conditions of shear free convection over high
roughness are of main importance
- To identify and review suitable data sets within and outside the group
that could be used to test and validate the pre-processors and models.
- To carry out intercomparisons and to summarise comparisons of different
schemes against each other and against data under specific conditions.
- To assess the influence of the model outputs of certain specific effects
such as complex topography, strong heterogeneity, slope effects and canopy
trapping on radiative fluxes.
- To assess the suitability of remote sensing tools to estimate canopy
characteristics and surface fluxes.
- To provide recommendations for the improvement of existing pre-processors
and models and for the development of new schemes.
- To provide recommendations for planning and conducting field campaigns in
order to fill the important existing gaps for empirical data of key
parameters for urban air pollution.
- To promote co-ordination of related activities in Europe of presently
scattered works, objectives, and responsibilities.
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What is the FMI ?
Air quality research at the