Deep-sea turbulence evolution observed by multiple closely spaced instruments

Abstract Turbulent mixing in the deep ocean is not well understood. The breaking of internal waves on sloped seafloor topography can generate deep-sea turbulence. However, it is difficult to measure turbulence comprehensively due to its multi-scale processes, in addition to flow–flow and flow–topogr...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Chu-Fang Yang, Wu-Cheng Chi, Hans van Haren
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ac94f348fbc041fe8d5e95165107e510
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:ac94f348fbc041fe8d5e95165107e510
record_format	dspace
spelling	oai:doaj.org-article:ac94f348fbc041fe8d5e95165107e5102021-12-02T12:11:50ZDeep-sea turbulence evolution observed by multiple closely spaced instruments10.1038/s41598-021-83419-22045-2322https://doaj.org/article/ac94f348fbc041fe8d5e95165107e5102021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83419-2https://doaj.org/toc/2045-2322Abstract Turbulent mixing in the deep ocean is not well understood. The breaking of internal waves on sloped seafloor topography can generate deep-sea turbulence. However, it is difficult to measure turbulence comprehensively due to its multi-scale processes, in addition to flow–flow and flow–topography interactions. Dense, high-resolution spatiotemporal coverage of observations may help shed light on turbulence evolution. Here, we present turbulence observations from four broadband ocean bottom seismometers (OBSs) and a 200-m vertical thermistor string (T-string) in a footprint of 1 × 1 km to characterize turbulence induced by internal waves at a depth of 3000 m on a Pacific continental slope. Correlating the OBS-calculated time derivative of kinetic energy and the T-string-calculated turbulent kinetic energy dissipation rate, we propose that the OBS-detected signals were induced by near-seafloor turbulence. Strong disturbances were detected during a typhoon period, suggesting large-scale inertial waves breaking with upslope transport speeds of 0.2–0.5 m s−1. Disturbances were mostly excited on the downslope side of the array where the internal waves from the Pacific Ocean broke initially and the turbulence oscillated between < 1 km small-scale ridges. Such small-scale topography caused varying turbulence-induced signals due to localized waves breaking. Arrayed OBSs can provide complementary observations to characterize deep-sea turbulence.Chu-Fang YangWu-Cheng ChiHans van HarenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chu-Fang Yang Wu-Cheng Chi Hans van Haren Deep-sea turbulence evolution observed by multiple closely spaced instruments
description	Abstract Turbulent mixing in the deep ocean is not well understood. The breaking of internal waves on sloped seafloor topography can generate deep-sea turbulence. However, it is difficult to measure turbulence comprehensively due to its multi-scale processes, in addition to flow–flow and flow–topography interactions. Dense, high-resolution spatiotemporal coverage of observations may help shed light on turbulence evolution. Here, we present turbulence observations from four broadband ocean bottom seismometers (OBSs) and a 200-m vertical thermistor string (T-string) in a footprint of 1 × 1 km to characterize turbulence induced by internal waves at a depth of 3000 m on a Pacific continental slope. Correlating the OBS-calculated time derivative of kinetic energy and the T-string-calculated turbulent kinetic energy dissipation rate, we propose that the OBS-detected signals were induced by near-seafloor turbulence. Strong disturbances were detected during a typhoon period, suggesting large-scale inertial waves breaking with upslope transport speeds of 0.2–0.5 m s−1. Disturbances were mostly excited on the downslope side of the array where the internal waves from the Pacific Ocean broke initially and the turbulence oscillated between < 1 km small-scale ridges. Such small-scale topography caused varying turbulence-induced signals due to localized waves breaking. Arrayed OBSs can provide complementary observations to characterize deep-sea turbulence.
format	article
author	Chu-Fang Yang Wu-Cheng Chi Hans van Haren
author_facet	Chu-Fang Yang Wu-Cheng Chi Hans van Haren
author_sort	Chu-Fang Yang
title	Deep-sea turbulence evolution observed by multiple closely spaced instruments
title_short	Deep-sea turbulence evolution observed by multiple closely spaced instruments
title_full	Deep-sea turbulence evolution observed by multiple closely spaced instruments
title_fullStr	Deep-sea turbulence evolution observed by multiple closely spaced instruments
title_full_unstemmed	Deep-sea turbulence evolution observed by multiple closely spaced instruments
title_sort	deep-sea turbulence evolution observed by multiple closely spaced instruments
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ac94f348fbc041fe8d5e95165107e510
work_keys_str_mv	AT chufangyang deepseaturbulenceevolutionobservedbymultiplecloselyspacedinstruments AT wuchengchi deepseaturbulenceevolutionobservedbymultiplecloselyspacedinstruments AT hansvanharen deepseaturbulenceevolutionobservedbymultiplecloselyspacedinstruments
_version_	1718394593875066880

Deep-sea turbulence evolution observed by multiple closely spaced instruments

Ejemplares similares