Spectra, variances and length scales in a marine stable boundary layer dominated by a low level jet

摘要: A flow situation over coastal waters of the Baltic Sea is studied. The boundary layer was characterized by stable stratification and presence a pronounced low level jet at very height, 30–150 m, above surface sea. atmospheric apparently extremely shallow; thus non-dimensional wind gradients temperature derived from measurements 8 m do not show adherence to Monin-Obukhov similarity, in sharp contrast findings same site similar stability conditions but with no jet. Instead these quantities are shown be governed scales characteristic shear away surface. height centre appears an important quantity. Thus, for cases lowest values (30–50 m), some turbulent characteristics (non-dimensional velocity standard deviations correlation between longitudinal vertical velocity) have those found zero pressure-gradient laboratory flat plate (the so called ‘canonical’ layer) rather than typical boundary-layer flow. It inferred that large scale fluctuations known as ‘inactive’ turbulence, well gravity waves, were suppressed this case.