Laboratory observations of double-diffusive convection using high-frequency broadband acoustics
Citable URI
https://hdl.handle.net/1912/3176As published
https://doi.org/10.1007/s00348-008-0570-9Keyword
Double-diffusion; Broadband acoustics; ConvectionAbstract
High-frequency broadband (200-300 kHz) acoustic
scattering techniques have been used to observe the
diffusive regime of double-diffusive convection in the
laboratory. Pulse compression signal processing techniques
allow 1) centimetre-scale interface thickness to
be rapidly, remotely, and continuously measured, 2) the
evolution, and ultimate merging, of multiple interfaces
to be observed at high-resolution, and 3) convection
cells within the surrounding mixed layers to be observed.
The acoustically measured interface thickness,
combined with knowledge of the slowly-varying temperatures
within the surrounding layers, in turn allows
the direct estimation of double-diffusive heat and buoyancy
fluxes. The acoustically derived interface thickness,
interfacial fluxes and migration rates are shown
to support established theory. Acoustic techniques complement
traditional laboratory sampling methods and
provide enhanced capabilities for observing the diffusive
regime of double-diffusion in the ocean.
Description
Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Experiments in Fluids 46 (2009): 355-364, doi:10.1007/s00348-008-0570-9.
Collections
Suggested Citation
Preprint: Ross, Tetjana, Lavery, Andone C., "Laboratory observations of double-diffusive convection using high-frequency broadband acoustics", 2008-09, https://doi.org/10.1007/s00348-008-0570-9, https://hdl.handle.net/1912/3176Related items
Showing items related by title, author, creator and subject.
-
Acoustic detection of oceanic double-diffusive convection : a feasibility study
Ross, Tetjana; Lavery, Andone C. (American Meteorological Society, 2010-03)The feasibility of using high-frequency acoustic scattering techniques to map the extent and evolution of the diffusive regime of double-diffusive convection in the ocean is explored. A scattering model developed to describe ... -
Double-diffusive processes : 1996 Summer Study Program in Geophysical Fluid Dynamics
Meacham, Stephen P.; Tucholke, Dacia (Woods Hole Oceanographic Institution, 1997-07)The physics of double diffusion and the role that it plays in the ocean provided the central theme for the 1996 summer program in Geophysical Fluid Dynamics at the Woods Hole Oceanographic Institution. Lectures and seminars ... -
Acoustic scattering from double-diffusive microstructure
Lavery, Andone C.; Ross, Tetjana (Acoustical Society of America, 2007-09)Laboratory measurements of high-frequency broadband acoustic backscattering (200–600 kHz) from the diffusive regime of double-diffusive microstructure have been performed. This type of microstructure, which was characterized ...