Impact of a sea breeze on the boundary-layer dynamics and the atmospheric stratification in a coastal area of the North Sea |
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| Authors: | Charles Talbot Patrick Augustin Céline Leroy Véronique Willart Hervé Delbarre Georgui Khomenko |
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| Institution: | 1.FRE 2816, ELICO,Université du Littoral C?te d’Opale,Wimereux,France;2.UMR 8101, LPCA,Université du Littoral C?te d’Opale,Dunkerque,France |
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| Abstract: | In-situ sodar and lidar measurements were coupled with numerical simulations for studying a sea-breeze event in a flat coastal
area of the North Sea. The study’s aims included the recognition of the dynamics of a sea-breeze structure, and its effects
on the lower troposphere stratification and the three-dimensional (3D) pollutant distribution. A sea breeze was observed with
ground-based remote sensing instruments and analysed by means of numerical simulations using the 3D non-hydrostatic atmospheric
model Meso-NH. The vertical structure of the lower troposphere was experimentally determined from the lidar and sodar measurements,
while numerical simulations focused on the propagation of the sea breeze inland. The sea-breeze front, the headwind, the thermal
internal boundary layer, the gravity current and the sea-breeze circulation were observed and analysed. The development of
a late stratification was also observed by the lidar and simulated by the model, suggesting the formation of a stable multilayered
structure. The transport of passive tracers inside the sea breeze and their redistribution above the gravity current was simulated
too. Numerical modelling showed that local pollutants may travel backward to the sea above the gravity current at relatively
low speed due to the shearing between the landward gravity current and the seaward synoptic wind. Such dynamic conditions
may enhance an accumulation of pollutants above coastal industrial areas. |
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| Keywords: | Lidar Numerical model Meso-NH Pollutants transport Sea breeze Sodar |
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