Trapped tidal currents generate freely propagating internal waves at the Arctic continental slope.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
08 Sep 2023
08 Sep 2023
Historique:
received:
23
03
2023
accepted:
01
09
2023
medline:
9
9
2023
pubmed:
9
9
2023
entrez:
8
9
2023
Statut:
epublish
Résumé
Energetic tidal currents in the Arctic play an important role in local mixing processes, but they are primarily confined to the shelves and continental slopes due to topographic trapping north of their critical latitude. Recent studies employing idealized models have suggested that the emergence of higher harmonic tidal waves along these slopes could serve as a conduit for tidal energy transmission into the Arctic Basin. Here we provide observational support from an analysis of yearlong observations from three densely-instrumented oceanographic moorings spanning 30 km across the continental slope north of Svalbard ([Formula: see text]81.3[Formula: see text]N). Full-depth current records show strong barotropic diurnal tidal currents, dominated by the K[Formula: see text] constituent. These sub-inertial currents vary sub-seasonally and are strongest at the 700-m isobath due to the topographic trapping. Coinciding with the diurnal tide peak in summer 2019, we observe strong baroclinic semidiurnal currents exceeding 10 cm s[Formula: see text] between 500 m and 1000 m depth about 10 km further offshore at the outer mooring. In this semidiurnal band, we identify super-inertial K[Formula: see text] waves, and present evidence that their frequency, timing, polarization, propagation direction and depths are consistent with the generation as higher harmonics of the topographically trapped K[Formula: see text] tide at the continental slope.
Identifiants
pubmed: 37684359
doi: 10.1038/s41598-023-41870-3
pii: 10.1038/s41598-023-41870-3
pmc: PMC10491755
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
14816Subventions
Organisme : Norges Forskningsråd
ID : 294396
Organisme : Norges Forskningsråd
ID : 294396
Informations de copyright
© 2023. Springer Nature Limited.
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