Tracking deep-sea internal wave propagation with a differential pressure gauge array

Abstract Temperature is used to trace ocean density variations, and reveals internal waves and turbulent motions in the deep ocean, called ‘internal motions.’ Ambient temperature detected by geophysical differential pressure gauges (DPGs) may provide year-long, complementary observations. Here, we u...

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Autores principales:	Chu-Fang Yang, Wu-Cheng Chi, Hans van Haren, Ching-Ren Lin, Ban-Yuan Kuo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e818bd6a2c864951a10d47658c68a429
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spelling	oai:doaj.org-article:e818bd6a2c864951a10d47658c68a4292021-12-05T12:13:38ZTracking deep-sea internal wave propagation with a differential pressure gauge array10.1038/s41598-021-02721-12045-2322https://doaj.org/article/e818bd6a2c864951a10d47658c68a4292021-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02721-1https://doaj.org/toc/2045-2322Abstract Temperature is used to trace ocean density variations, and reveals internal waves and turbulent motions in the deep ocean, called ‘internal motions.’ Ambient temperature detected by geophysical differential pressure gauges (DPGs) may provide year-long, complementary observations. Here, we use data from four DPGs fixed on the ocean bottom and a high-resolution temperature sensor (T-sensor) 13 m above the seafloor as a square-kilometer array deployed offshore ~ 50 km east of Taiwan facing the open Pacific Ocean to examine the impact of temperature on DPG signals related to internal motions. The DPG signals correlate with T-sensor temperature variations between 0.002 and 0.1 mHz, but have time shifts partially caused by slow thermal conduction from the ambient seafloor to the DPG chamber and partially by internal motion propagation time across the array. Applying beamforming-frequency-wavenumber analysis and linear regression to the arrayed T-sensor and DPG data, we estimate the propagating slowness of the internal motions to be between 0.5 and 7.4 s m−1 from the northwest and northeast quadrants of the array. The thermal relaxation time of the DPGs is within 103–104 s. This work shows that a systematic scan of DPG data at frequencies < 0.1 mHz may help shed light on patterns of internal wave propagation in the deep ocean, especially in multi-scale arrays.Chu-Fang YangWu-Cheng ChiHans van HarenChing-Ren LinBan-Yuan KuoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (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 Ching-Ren Lin Ban-Yuan Kuo Tracking deep-sea internal wave propagation with a differential pressure gauge array
description	Abstract Temperature is used to trace ocean density variations, and reveals internal waves and turbulent motions in the deep ocean, called ‘internal motions.’ Ambient temperature detected by geophysical differential pressure gauges (DPGs) may provide year-long, complementary observations. Here, we use data from four DPGs fixed on the ocean bottom and a high-resolution temperature sensor (T-sensor) 13 m above the seafloor as a square-kilometer array deployed offshore ~ 50 km east of Taiwan facing the open Pacific Ocean to examine the impact of temperature on DPG signals related to internal motions. The DPG signals correlate with T-sensor temperature variations between 0.002 and 0.1 mHz, but have time shifts partially caused by slow thermal conduction from the ambient seafloor to the DPG chamber and partially by internal motion propagation time across the array. Applying beamforming-frequency-wavenumber analysis and linear regression to the arrayed T-sensor and DPG data, we estimate the propagating slowness of the internal motions to be between 0.5 and 7.4 s m−1 from the northwest and northeast quadrants of the array. The thermal relaxation time of the DPGs is within 103–104 s. This work shows that a systematic scan of DPG data at frequencies < 0.1 mHz may help shed light on patterns of internal wave propagation in the deep ocean, especially in multi-scale arrays.
format	article
author	Chu-Fang Yang Wu-Cheng Chi Hans van Haren Ching-Ren Lin Ban-Yuan Kuo
author_facet	Chu-Fang Yang Wu-Cheng Chi Hans van Haren Ching-Ren Lin Ban-Yuan Kuo
author_sort	Chu-Fang Yang
title	Tracking deep-sea internal wave propagation with a differential pressure gauge array
title_short	Tracking deep-sea internal wave propagation with a differential pressure gauge array
title_full	Tracking deep-sea internal wave propagation with a differential pressure gauge array
title_fullStr	Tracking deep-sea internal wave propagation with a differential pressure gauge array
title_full_unstemmed	Tracking deep-sea internal wave propagation with a differential pressure gauge array
title_sort	tracking deep-sea internal wave propagation with a differential pressure gauge array
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e818bd6a2c864951a10d47658c68a429
work_keys_str_mv	AT chufangyang trackingdeepseainternalwavepropagationwithadifferentialpressuregaugearray AT wuchengchi trackingdeepseainternalwavepropagationwithadifferentialpressuregaugearray AT hansvanharen trackingdeepseainternalwavepropagationwithadifferentialpressuregaugearray AT chingrenlin trackingdeepseainternalwavepropagationwithadifferentialpressuregaugearray AT banyuankuo trackingdeepseainternalwavepropagationwithadifferentialpressuregaugearray
_version_	1718372167625736192

Tracking deep-sea internal wave propagation with a differential pressure gauge array

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