Analysis of turbulent motion phenomena in the maritime atmospheric boundary layer

The structure of the maritime boundary layer was investigated using statistical methods for turbulent structure (ensemble averaging) as well as single-structure analysis (conditional sampling) and based on the data of the measuring campaign JASIN (Joint-Air-Sea Interaction experiments), a subprogram of GARP. The evaluation of these data improved the knowledge of the structure of the turbulence in the mainly neutral to slightly unstable layered medium and upper maritime atmospheric boundary layer (maritime Ekman layer). The classical, closed, three-dimensional turbulence elements were less demonstrated than the existence of perturbing components in the wind field which suddenly occur in locally and temporatily limited regions of maximum wind shear. In the ideal case, closed vortex structures develop which can be demonstrated in fluctuation and correlation series.