Driss Bari 1, Thierry Bergot2

Direction de la Météorologie Nationale, Casa-Oasis, Casablanca 8106, Morocco
Centre National de Recherches Météorologiques, UMR3589, 42 Avenue Coriolis, 31057 Toulouse, France

Received: November 29, 2016
Revised: June 8, 2017
Accepted: June 13, 2017
Download Citation: ||https://doi.org/10.4209/aaqr.2016.11.0520  

  • Download: PDF

Cite this article:
Bari, D. and Bergot, T. (2018). Influence of Environmental Conditions on Forecasting of an Advection-Radiation Fog: A Case Study from the Casablanca Region, Morocco. Aerosol Air Qual. Res. 18: 62-78. https://doi.org/10.4209/aaqr.2016.11.0520


  • Influence of northerly moist wind on the onset of advection-radiation fog.
  • Influence of southerly dry wind on the dissipation of fog during the night.
  • Sensitivity to aerosol of fog in coastal regions.
  • Influence of topography and urbanization on the life cycle of fog


In this study, a dense advection-radiation fog that occurred over the Grand Casablanca region, Morocco, during the night of 23–24 December 2013, is investigated. The adverse visibility induced by the fog patch led to a series of collisions and loss of life on a highway of the region. This fog event is simulated by the Meso-NH research model. Conventional observations from two synoptic stations, satellite imagery, and the European Center for Medium-Range Weather Forecasts (ECMWF) reanalysis are used to analyze the physical processes during the whole life cycle of the event. Some hypotheses on the influence of environmental conditions (topography, land-sea heterogeneity, urbanization) on the numerical fog prediction are presented. Observational analysis together with numerical results show that the horizontal moisture transport, linked to a northerly wind during the afternoon, drove the onset of this fog event. The formation stage was governed by weak turbulence and nocturnal radiative cooling at both stations (costal station, GMMC, and inland station, GMMN). Horizontal moisture flux convergence was observed at the top of the fog layer, over the coastal station, during the mature phase, in addition to the radiative-turbulent interactions. The latter was the main mechanism leading to fog thickening at the inland station. The dissipation phase was governed by a zone of horizontal moisture flux divergence linked to a dry wind from the south. Sensitivity experiments show that numerical coastal fog prediction is influenced by local topography, urbanization and aerosol types, but less by land cover.

Keywords: Advection-radiation fog; Coastal fog; Urbanization; Topography; Land-sea thermal contrast; Aerosols.


Share this article with your colleagues 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

79st percentile
Powered by
   SCImago Journal & Country Rank

2023 Impact Factor: 2.5
5-Year Impact Factor: 2.8

Aerosol and Air Quality Research partners with Publons

CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit
CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal that promotes submissions of high-quality research and strives to be one of the leading aerosol and air quality open-access journals in the world. We use cookies on this website to personalize content to improve your user experience and analyze our traffic. By using this site you agree to its use of cookies.