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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., Zhao, Z., & Rhein, M. (2020). Observations of the low-mode internal tide and its interaction with mesoscale flow south of the Azores. Journal of Geophysical Research: Oceans, 125:. doi:10.1029/2019JC015879.

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アイテムのパーマリンク: https://hdl.handle.net/21.11116/0000-0007-8131-F 版のパーマリンク: https://hdl.handle.net/21.11116/0000-000D-B3DB-2
資料種別: 学術論文

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2019JC015879.pdf (出版社版), 6MB
ファイルのパーマリンク:
https://hdl.handle.net/21.11116/0000-0007-82CF-D
ファイル名:
2019JC015879.pdf
説明:
-
OA-Status:
Hybrid
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公開
MIMEタイプ / チェックサム:
application/pdf / [MD5]
技術的なメタデータ:
著作権日付:
2020
著作権情報:
© The authors

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作成者

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

内容説明

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キーワード: circulation modeling; energy flux; internal tide; mesoscale eddy; mooring system; oceanic circulation; satellite altimetry; satellite data; temporal variation; time series analysis, Azores; Portugal
 要旨: 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.

資料詳細

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言語: eng - English
 日付: 2020-11
 出版の状態: 出版
 ページ: -
 出版情報: -
 目次: -
 査読: 査読あり
 識別子(DOI, ISBNなど): DOI: 10.1029/2019JC015879
BibTex参照ID: LöbKöhlerEtAl2020
 学位: -

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出版物 1

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出版物名: Journal of Geophysical Research: Oceans
種別: 学術雑誌
 著者・編者:
所属:
出版社, 出版地: Hoboken, NJ : Wiley
ページ: - 巻号: 125 通巻号: e2019JC015879 開始・終了ページ: - 識別子(ISBN, ISSN, DOIなど): ISSN: 2169-9291
CoNE: https://pure.mpg.de/cone/journals/resource/2169-9291