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RISNote on Spectral Diffusivity Theory
Publisher: American Meteorological Society
Abstract: The diffusion equation with a wavenumber-dependent diffusivity is derived as an approximation to the statistical theory of plume dispersion from a continuous point source. The travel time explicitly appearing in the ...
Mixed and Dynamic Response of Hot Wires and Cold Wires and Measurements of Turbulence Statistics
Publisher: American Meteorological Society
Abstract: Hot wires respond to temperature as well as to velocity, whereas cold wires respond to velocity as well as to temperature. The static and dynamic response characteristics are summarized and it is shown that the frequency ...
A Phase-Locked Loop Continuous Wave Sonic Anemometer-Thermometer
Publisher: American Meteorological Society
Abstract: A continuous wave sonic anemometer-thermometer has been developed for simultaneous measurements of vertical velocity and temperature. The phase angle fluctuations are detected by means of a monolithic integrated phase-locked ...
Inertial-Dissipation Air-Sea Flux Measurements: A Prototype System Using Realtime Spectral Computations
Publisher: American Meteorological Society
Abstract: A prototype system for the measurement and computation of air?sea fluxes in realtime was tested in the Humidity Exchange Over the Sea (HEXOS) main experiment, HEXMAX. The system used a sonic anemometer/thermometer for wind ...
Turbulence Sensor Dynamic Calibration Using Real-Time Spectral Computations
Publisher: American Meteorological Society
Abstract: The integration of plug-in Fast Fourier Transform (FFT) boards in data acquisition computers allows a considerable development in the dynamic calibration of turbulence sensors. The spectral transfer function of a fast and ...
Measurement of Temperature Spectra by a Sonic Anemometer
Publisher: American Meteorological Society
Abstract: The response of a Kaijo Denki DAT 300 ultrasonic anemometer-thermometer is analyzed with respect to temperature and vertical velocity. The effects of the emitting-receiving cycle of the transducer array on w, T, and CowT ...
The Coupling between Wind and Waves in the WAM Model
Publisher: American Meteorological Society
Abstract: The reliability of the wave model (WAM, cycle 4) for predicting waves and wind stress in restricted fetches is investigated using measured data obtained during the Ris? Air?Sea Experiment (RASEX) at Vindeby, Denmark. The ...
The Dissipation Range of Wind-Wave Spectra Observed on a Lake
Publisher: American Meteorological Society
Abstract: Based on an interpretation of a field experiment it is argued that, due to breaking of wind waves in deep water, the dissipation of energy is restricted to a range of frequencies ? > ?g, much higher than the frequency ?m ...
On the Dependence of Sea Surface Roughness on Wind Waves
Publisher: American Meteorological Society
Abstract: The influence of wind waves on the momentum transfer (wind stress) between the atmosphere and sea surface was studied using new measured data from the RASEX experiment and other datasets compiled by Donelan et al. Results ...