Measurements of fluctuations of vertical wind velocity,temperature and radio-refractive index above the sea |
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| Authors: | G Kruspe |
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| Institution: | (1) Institut für Radiometeorologie und Maritime Meteorologie an der Universität Hamburg, Hamburg, Germany |
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| Abstract: | Mean spectra of vertical wind velocity, temperature, and humidity and co-spectra of vertical turbulent heat and moisture fluxes are reported, normalized in terms of the similarity theory of Monin-Obukhov. The measurements were made in April 1967 at light-house  Alte Weser at a height of 30 m above the German Bight. Ten spectra measured under conditions of moderate instability (z/L  –0.08) have been used for the evaluation of a mean spectral curve. The humidity fluctuations have been determined from simultaneous turbulence measurements of temperature and radiorefractive-index, which were obtained by a microwave refractometer.Similar to the BOMEX measurements discussed by Phelps and Pond (1971) our results also show a dissimilarity between the fluctuations of temperature and humidity. Accordingly, in the range of lower and higher natural frequencies, significant differences were present between the co-spectra of the vertical heat and moisture fluxes, although the mean peak frequencies of both the fluxes nearly correspond to that of the mean vertical wind-velocity spectrum (f
m 0.35). |
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