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  Observations of the low-mode internal tide and its interaction with mesoscale flow south of the Azores

Löb, J., Köhler, J., Mertens, C., Walter, M., Li, Z., von Storch, J.-S., et al. (2020). Observations of the low-mode internal tide and its interaction with mesoscale flow south of the Azores. Journal of Geophysical Research: Oceans, 125: e2019JC015879. doi:10.1029/2019JC015879.

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2019JC015879.pdf (Verlagsversion), 6MB
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2020
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© The authors

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 Urheber:
Löb, J., Autor
Köhler, J., Autor
Mertens, C., Autor
Walter, M., Autor
Li, Zhuhua1, Autor           
von Storch, Jin-Song1, Autor                 
Zhao, Z., Autor
Rhein, M., Autor
Affiliations:
1Ocean Statistics, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, ou_913558              

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Schlagwörter: circulation modeling; energy flux; internal tide; mesoscale eddy; mooring system; oceanic circulation; satellite altimetry; satellite data; temporal variation; time series analysis, Azores; Portugal
 Zusammenfassung: Understanding the temporal variability of internal tides plays a crucial role in identifying sources and sinks of energy in the ocean. Using a 10-month-long time series from moored instruments inside a tidal beam south of the Azores, the magnitude and the underlying causes of temporal variability in the first two modes of the internal tide energy flux was studied. We analyzed changes of the direction and coherence of the energy flux, its modal structure, and the impact of two eddies. Semidiurnal energy fluxes were further compared with estimates from a 1/10° ocean global circulation model, as well as with fluxes derived from satellite altimetry. All energy fluxes correlate reasonably well in direction, deviations from its fixed phase relation to astronomical forcing, and modal composition while model and satellite underestimate the total energy flux. A pronounced damping of the in situ fluxes coincides with the passing of two eddies. In the presence of a surface-intensified eddy, the coherent part of the energy flux in the first two modes is lowered by more than 40, a subsurface eddy coincides with a decrease of the energy flux mainly in the second mode. These observations support the hypothesis that eddy interactions increase the incoherent part of the energy flux and transfer energy from low modes into higher modes, which can lead to increased local dissipation. It remains an open question how much of the energy converted from lower to higher modes results in local dissipation, a crucial part in creating energetically consistent ocean-climate models. © 2020. The Authors.

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Sprache(n): eng - English
 Datum: 2020-11
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1029/2019JC015879
BibTex Citekey: LöbKöhlerEtAl2020
 Art des Abschluß: -

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Titel: Journal of Geophysical Research: Oceans
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Hoboken, NJ : Wiley
Seiten: - Band / Heft: 125 Artikelnummer: e2019JC015879 Start- / Endseite: - Identifikator: ISSN: 2169-9291
CoNE: https://pure.mpg.de/cone/journals/resource/2169-9291