Experimental investigation of the wave-interaction mechanism for ambient noise

1990 ◽  
Vol 15 (4) ◽  
pp. 282-285 ◽  
Author(s):  
R.H. Mellen
Keyword(s):  
Experimental Investigation ◽  
Ambient Noise ◽  
Interaction Mechanism ◽  
Wave Interaction

Modelling infrasonic ocean ambient noise using NWP and lidar observations in southern Argentina

2020 ◽  
Author(s):  
Lars Ceranna ◽  
Patrick Hupe ◽  
Marine de Carlo ◽  
Alexis Le Pichon
Keyword(s):  
Ambient Noise ◽  
Middle Atmosphere ◽  
Weather Prediction ◽  
Wave Interaction ◽  
Sensitivity Study ◽  
Seasonal Effects ◽  
Wave Interactions ◽  
Lidar Measurements ◽  
One Year ◽  
Semi Empirical

<p><span>In routine processing of infrasound data of the International Monitoring System, coherent ocean ambient noise with dominant frequencies ranging from 0.1 to 0.5 Hz appears in overlapping frequency bands. These signals, so-called microbaroms, originate from complex wave interactions. In this study, microbarom detections are used as calibration signals, and their amplitudes at the Argentinian infrasound station IS02 are modelled based on operational ocean wave interaction simulations and a semi-empirical attenuation relation. This relation strongly depends on the middle atmosphere (MA) dynamics. Previous studies have shown that the MA wind and temperature are not properly resolved in numerical weather prediction (NWP) models. Therefore, high-resolution soundings of the Compact Rayleigh Autonomous Lidar (CORAL) are incorporated in the modelling. The infrasound data are processed using the progressive Multi-Channel Correlation (PMCC) algorithm.</span></p><p><span>This sensitivity study focuses on one year of collocated infrasound and lidar measurements in southern Argentina. It highlights the seasonal effects of MA uncertainties on infrasound propagation and detections in 2018.</span></p>

A transport-equation description of nonlinear ocean surface wave interactions

1975 ◽  
Vol 70 (4) ◽  
pp. 815-826 ◽  
Author(s):  
Kenneth M. Watson ◽  
Bruce J. West
Keyword(s):  
Surface Wave ◽  
Transport Equation ◽  
Energy Transport ◽  
Wave Spectrum ◽  
Interaction Mechanism ◽  
Wave Interaction ◽  
Ocean Current ◽  
Wave Interactions ◽  
Ocean Surface Wave ◽  
Wind Source

The evolution of the power spectrum of surface gravity waves is described by means of an energy transport equation. A slowly varying, prescribed ocean current and wind source are assumed to account for spatial inhomogeneities in the surface wave spectrum. These inhomogeneities lead to a new nonlinear wave-wave interaction mechanism.

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