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

Tang, Qunshu; Tong, Vincent C.H.; Hobbs, Richard W.; Morales Maqueda, Miguel Ángel

Abstract

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 (|ΔT|), increases in length over ~3 days coupled with an increase in |ΔT|. A critical mixing state, in which turbulent diffusion is gradually replaced by double-diffusion as the dominant mixing process, is thus revealed.

Citation

Tang, Q., Tong, V. C., Hobbs, R. W., & Morales Maqueda, M. Á. (2019). Detecting changes at the leading edge of an interface between oceanic water layers. Nature Communications, 10(1), Article 4674. https://doi.org/10.1038/s41467-019-12621-8

• Journal Article Type: Article
• Acceptance Date: Sep 13, 2019
• Online Publication Date: Oct 14, 2019
• Publication Date: Oct 14, 2019
• Deposit Date: Oct 25, 2019
• Publicly Available Date: Oct 25, 2019
• Journal: Nature Communications
• Electronic ISSN: 2041-1723
• Publisher: Nature Research
• Peer Reviewed: Peer Reviewed
• Volume: 10
• Issue: 1
• Article Number: 4674
• DOI: https://doi.org/10.1038/s41467-019-12621-8
• Public URL: https://durham-repository.worktribe.com/output/1281545