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Modelling Local Sea-Breeze Flow and Associated Dispersion Patterns Over a Coastal Area in North-East Spain: A Case Study

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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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Authors and Affiliations

  1. Department of Astronomy and Meteorology, Faculty of Physics, University of Barcelona, Avinguda Diagonal 647, 08028, Barcelona, Spain

    M. R. Soler, R. Arasa, M. Merino & M. Olid

  2. Departament de Física I Enginyeria Nuclear, Universitat, Politècnica de Catalunya, Vilanova i la Geltrú, Barcelona, Spain

    S. Ortega

Authors
  1. M. R. Soler
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  2. R. Arasa
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  3. M. Merino
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  4. M. Olid
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  5. S. Ortega
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Correspondence to M. R. Soler.

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Soler, M.R., Arasa, R., Merino, M. et al. Modelling Local Sea-Breeze Flow and Associated Dispersion Patterns Over a Coastal Area in North-East Spain: A Case Study. Boundary-Layer Meteorol 140, 37–56 (2011). https://doi.org/10.1007/s10546-011-9599-z

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