Vertical wavenumber spectra of three-dimensional winds revealed by radiosonde observations at midlatitude

The Wavenumber Spectra of Scatterometer-derived Winds

Spaceborne scatterometers are the only proven method for global all-weather measurement of vector winds at the ocean’s surface. Such measurements are critical inputs in studies of oceanic circulation and air/seainteraction where the time variability of the surface wind field and the wind stress curl drive the ocean; hence, our interest in the spectrum of the surface wind field. In this paper we...

Investigation of vertical wavenumber and frequency spectra of gravity-wave-induced vertical wind and temperature perturbations

233 hours of high-precision vertical wind and temperature measurements in the mesosphere and lower thermosphere (MLT) were used to study the spectra of gravity wave perturbations in the mesopause region. The temperature spectra are generally consistent with the theoretical predictions of gravity wave theory. The averaged slope of the frequency (f) spectra is –1.83±0.08, while the slope of the v...

Improvement of vertical winds

Representativeness errors for radiosonde observations

Data from the United Kingdom operational upper air network, as well as from special radiosonde trials, have been analysed to provide statistics of spatial and temporal atmospheric variations. These statistics are applied to a study of the network performance and of representativeness errors associated with the use of the data in synoptic analysis. The results also have application to comparison...

Modified Wavenumber Domain Algorithm for Three-dimensional Millimeter-wave Imaging

Millimeter-wave (MMW) imaging techniques have been used for the detection of concealed weapons and contraband carried on personnel at airports and other secure locations. The combination of frequency-modulated continuous-wave (FMCW) technology and MMW imaging techniques should lead to compact, light-weight, and low-cost systems which are especially suitable for security and detection applicatio...