Analyzing the basic features of different complex terrain flows by means of Doppler SODAR and a numerical model: some implications for air pollution problems

R. Soler, J. Hinojosa, M. Bravo, D. Pino, J. Vilà-Guerau de Arellano

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

Abstract

A variety of programmes and field experiments were carried out in order to develop and evaluate models of transport and diffusion of pollutants in complex terrain areas. As part of this programme, in this study, we have focused our interest on analyzing the basic features of different flow fields and thermal structures developed in a complex area and their relation to air pollution problems. The area is located in the province of Barcelona (in the northeast of Spain) close to a wide industrial zone, thus a pollutant flux could affect this region. In order to carry out the main purpose of this study we have analysed data from a Doppler Sodar (FAS 64) and a network of near surface meteorological and air quality stations. In addition, different dynamical simulations given by a numerical mesoscale model (MM5) are also analyzed. The results show that the main flow fields and thermal structures generated in this area are: sea breeze, slope drainage winds, channelling winds created by terrain constrictions and cool-air accumulation in low-lying regions. This last structure, developed specially in winter time, gives rise to stagnant cold air masses and strong thermic inversions, with average lapse rate of –4 degrees on 100thinspm, which contribute to increase air pollution concentration, especially SO2. Hourly and daily averaged SO2 concentration can be higher than 350 and 138thinspµgthinspm–3 respectively. In addition, as ldquoLa Planardquo is located not far from the Mediterranean Sea, during summertime the sea breeze arrives into this zone via its southern entrance, thereby reaching the whole area. The arrival of the sea breeze in to ldquoLa Planardquo, which advects pollutants from the nearby industrial area, is the main cause of some of these pollutants, especially ozone and its precursors, attaining high concentrations during afternoon hours. The contribution of the sea breeze is variable, but could represent between a 25% to a 30% of its total value.
Original languageEnglish
Pages (from-to)141-154
JournalMeteorology and Atmospheric Physics
Volume85
Issue number1-3
DOIs
Publication statusPublished - 2004

Keywords

  • stable boundary-layer
  • valley winds
  • simulations

Fingerprint Dive into the research topics of 'Analyzing the basic features of different complex terrain flows by means of Doppler SODAR and a numerical model: some implications for air pollution problems'. Together they form a unique fingerprint.

Cite this