Observational Study of the Surface Layer at an Ocean–Land Transition Region

Luiz Eduardo Medeiros, Roberto de Oliveira Magnago, Gilberto Fisch, Edson Roberto Marciotto

Abstract


http://dx.doi.org/10.5028/jatm.v5i4.244

High-frequency measurements of wind, and temperature were made during the dry season of 2008 to study the development of an internal boundary layer at the main Brazilian space launching centre, Centro de Lançamento de Alcântara at Alcântara, Maranhão, Brazil. Turbulence measurements taken at the coast, in two different points 227 m apart show different daily cycles of turbulent kinetic energy friction velocity (u*), and buoyancy flux . Surface roughness change, surface heating change, and a gap in the natural vegetation seem to be the causes for the variation in these turbulent parameters. The mean wind cycle also shows distinct patterns. It seems that, first, internal boundary layers develop when the oceanic surface layer reaches the continent, and a second when the first internal boundary layer’s flow encounters the gap. A direct implication is that turbulence is not horizontally homogeneous and measurements taken at single places are not spatially representative. Knowing how turbulence varies spatially is necessary information to understand the diffusion of pollutants exhausted by rockets near the coast.


Keywords


Coast, Internal boundary layer, Sonic anemometer, Surface layer

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