Środowiskowe Seminarium Fizyki Atmosfery

During the talk the gradient-based similarity theory for stably stratified shear flows will be discussed. Gradient -based similarity scales will be classified into two categories, referred to as explicit and implicit. The explicit scaling employs the length scale as a specified function of height above the underlying surface. Within the implicit type, the mixing length is locally related to various moments of turbulence. The form of the gradient-based similarity functions, for the considered scaling systems, can be obtained by the renormalization of explicit-type expressions. Similarity functions of the Richardson number Ri for the dissipation-type scalingwill be derived and compared with the data obtained during the SHEBA experiment in the Arctic surface layer. Since the implicit approach is not directly dependent on height, thus it can be applied in the entire stableboundary layer, but also in free turbulent flows in the upper atmosphere, in lakes, and in oceans.