Modelling Local Sea-Breeze Flow and Associated Dispersion Patterns Over a Coastal Area in North-East Spain: A Case Study |
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| Authors: | M R Soler R Arasa M Merino M Olid S Ortega |
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| Institution: | 1.Department of Astronomy and Meteorology, Faculty of Physics,University of Barcelona,Barcelona,Spain;2.Departament de Física I Enginyeria Nuclear,Universitat, Politècnica de Catalunya,Barcelona,Spain |
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| Abstract: | The structure and evolution of the sea breeze in the north-west part of the Mediterranean (Catalonia, north-east Spain) is
studied both experimentally and, predominantly, using numerical models to increase understanding of sea-breeze structure and
three-dimensional (3D) pollution distributions in coastal environments. Sea-breeze components are modelled and analyzed using
the fifth-generation Pennsylvania State University–National Centre for Atmospheric Research Mesoscale Model (MM5). The results
show that the growth and structure of the sea-breeze circulation is modulated by the synoptic flow and especially by the complex
topography of the area. 3D pollution transport in a sea breeze is modelled by coupling the MM5 to the Community Multiscale
Air Quality (CMAQ) model, with results indicating that topography and synoptic flow are the main factors modulating horizontal
and vertical pollutant transport in sea-breeze episodes. In this way, horizontal dispersion is limited by the complex topography
of the area, whilst the sea-breeze flow is intensified by anabatic upslope winds that contribute to vertical pollutant transport.
The numerical model results also indicate that the sea-breeze circulation with a weak return flow at upper levels grows due
to a synoptic onshore wind component. However, such a sea-breeze circulation is capable of transporting pollutants towards
the coast. |
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