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A fast, high-sensitivity detector is required for studies of environmentally relevant gases. Photoacoustic spectroscopy (PAS), an absorption spectroscopy technique in which absorption is detected as sound, is explored as a possible solution. A tuning-fork based PAS sensor is modeled using COMSOL Multiphysics. The model combines the acoustic and piezoelectric modules and also includes viscous damping...
A recent data acquisition program obtained ocean wave measurements in high-energy wave conditions offshore of southern Australia in 1400 meters water depth. A taut-wire subsurface mooring was employed to position acoustic Doppler current profilers (ADCPs) near the surface to resolve wave height and direction across a majority of the wave spectrum. The trick to this technique was quantifying and removing...
Much progress in understanding the coupling between the atmosphere and the sea has been made during the past years. Here we discuss the implications of the recent discovery of enhanced (above wall layer predictions) dissipation rates in the upper ocean. In particular, we look at estimates of surface roughness and discuss mechanisms of wave-turbulence interaction.
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