Preprint

Experimental study of internal wave generation by convection in water

Michaël Le BarsDaniel LecoanetKavli Institute for Theoretical Physics , University of California , Santa Barbara , CA 93106 , USAStéphane PerrardCNRS , Aix-Marseille Université , Ecole Centrale Marseille , IRPHE UMR 7342 , 49 rue F. Joliot-Curie , 13013 Marseille , FranceA. RibeiroDepartment of Earth, Planetary, and Space Sciences , University of Cal- ifornia , Los Angeles , CA 90095-1567 , USAL. RodetCNRS , Aix-Marseille Université , Ecole Centrale Marseille , IRPHE UMR 7342 , 49 rue F. Joliot-Curie , 13013 Marseille , FranceJ. M. AurnouDepartment of Earth, Planetary, and Space Sciences , University of Cal- ifornia , Los Angeles , CA 90095-1567 , USAPatrice Le Gal

2015en

Ochiq kirishYashil

ABI

Annotatsiya

We experimentally investigate the dynamics of water cooled from below at 0^oC and heated from above. Taking advantage of the unusual property that water's density maximum is at about 4^oC, this set-up allows us to simulate in the laboratory a turbulent convective layer adjacent to a stably stratified layer, which is representative of atmospheric and stellar conditions. High precision temperature and velocity measurements are described, with a special focus on the convectively excited internal waves propagating in the stratified zone. Most of the convective energy is at low frequency, and corresponding waves are localized to the vicinity of the interface. However, we show that some energy radiates far from the interface, carried by shorter horizontal wavelength, higher frequency waves. Our data suggest that the internal wave field is passively excited by the convective fluctuations, and the wave propagation is correctly described by the dissipative linear wave theory.

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DOI: 10.48550/arxiv.1506.05572

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