Detecting changes at the leading edge of an interface between oceanic water layers

Many physical phenomena in the ocean involve interactions between water masses of different temperatures and salinities at boundaries. Of particular interest is the characterisation of finescale structure at the marginal interaction zones of these boundaries, where the structure is either destroyed...

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Bibliographic Details
Published in:Nature communications 2019-10, Vol.10 (1), p.4674-8, Article 4674
Main Authors: Tang, Qunshu, Tong, Vincent C. H., Hobbs, Richard W., Morales Maqueda, Miguel Ángel
Format: Article
Language:English
Subjects:
704/829
704/829/2737
Basins
Boundaries
Change detection
Earth science
Eddy diffusion
Humanities and Social Sciences
Image resolution
Interfaces
multidisciplinary
Physical properties
Science
Science (multidisciplinary)
Seismic surveys
Stratigraphy
Temperature
Thermocline
Turbulent diffusion
Water masses
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Summary:Many physical phenomena in the ocean involve interactions between water masses of different temperatures and salinities at boundaries. Of particular interest is the characterisation of finescale structure at the marginal interaction zones of these boundaries, where the structure is either destroyed by mixing or formed by stratification. Using high-resolution seismic reflection imaging, we present observations of temporal changes at the leading edge of an interface between sub-thermocline layers in the Panama Basin. By studying time-lapse images of a seismic reflector between two water boundaries with subtle differences, we provide empirical constraints on how stratified layers evolve. The leading edge of this reflector, which is characterised by a gradual lateral decrease in vertical temperature contrast ( ∣ Δ T ∣ ), increases in length over ~3 days coupled with an increase in ∣ Δ T ∣ . A critical mixing state, in which turbulent diffusion is gradually replaced by double-diffusion as the dominant mixing process, is thus revealed. The marginal interaction zones of oceans are understudied. Here, the authors analyse seismic observations of temporal changes at the interface between thermocline layers in the Panama Basin, that reveal a critical mixing state in which turbulent diffusion is gradually replaced by double-diffusion as the dominant mixing process.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-019-12621-8