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Tidal control of the flow through long, narrow straits: a modeling study for the Seto Inland Sea

Even in coastal oceans where tidal currents are predominant, long-term mean currents are of great interest since they are responsible for the transport of materials over long timescales. Tides could significantly affect mean currents in long, narrow straits due to tide-topography interaction, but it...

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Autores principales: Kurogi, Masao, Hasumi, Hiroyasu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6715803/
https://www.ncbi.nlm.nih.gov/pubmed/31467292
http://dx.doi.org/10.1038/s41598-019-47090-y
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author Kurogi, Masao
Hasumi, Hiroyasu
author_facet Kurogi, Masao
Hasumi, Hiroyasu
author_sort Kurogi, Masao
collection PubMed
description Even in coastal oceans where tidal currents are predominant, long-term mean currents are of great interest since they are responsible for the transport of materials over long timescales. Tides could significantly affect mean currents in long, narrow straits due to tide-topography interaction, but it is yet unclear how and to what extent tides control throughflows. Here, we focus on the throughflow in the Seto Inland Sea, Japan, which has enormous impacts on the marine environment while its long-term mean characteristics, even the flow direction, are not well described by observations. By using a state-of-the-art ocean model, we show that the simulated throughflow is eastward on annual average and its volume transport is considerably suppressed by tides. It is found that tides enhance mixing and induce time-mean eddies, and both work to reduce the throughflow. A westward throughflow was previously estimated based on an acoustic measurement. The discrepancy between this estimate and our result would be due to whether or not such eddies are taken into account. These findings imply that tides may also suppress the throughflow of the other straits around the world. Revealing such tidal effects may contribute to a better performance of oceanic and climate simulations.
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spelling pubmed-67158032019-09-13 Tidal control of the flow through long, narrow straits: a modeling study for the Seto Inland Sea Kurogi, Masao Hasumi, Hiroyasu Sci Rep Article Even in coastal oceans where tidal currents are predominant, long-term mean currents are of great interest since they are responsible for the transport of materials over long timescales. Tides could significantly affect mean currents in long, narrow straits due to tide-topography interaction, but it is yet unclear how and to what extent tides control throughflows. Here, we focus on the throughflow in the Seto Inland Sea, Japan, which has enormous impacts on the marine environment while its long-term mean characteristics, even the flow direction, are not well described by observations. By using a state-of-the-art ocean model, we show that the simulated throughflow is eastward on annual average and its volume transport is considerably suppressed by tides. It is found that tides enhance mixing and induce time-mean eddies, and both work to reduce the throughflow. A westward throughflow was previously estimated based on an acoustic measurement. The discrepancy between this estimate and our result would be due to whether or not such eddies are taken into account. These findings imply that tides may also suppress the throughflow of the other straits around the world. Revealing such tidal effects may contribute to a better performance of oceanic and climate simulations. Nature Publishing Group UK 2019-08-29 /pmc/articles/PMC6715803/ /pubmed/31467292 http://dx.doi.org/10.1038/s41598-019-47090-y Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Kurogi, Masao
Hasumi, Hiroyasu
Tidal control of the flow through long, narrow straits: a modeling study for the Seto Inland Sea
title Tidal control of the flow through long, narrow straits: a modeling study for the Seto Inland Sea
title_full Tidal control of the flow through long, narrow straits: a modeling study for the Seto Inland Sea
title_fullStr Tidal control of the flow through long, narrow straits: a modeling study for the Seto Inland Sea
title_full_unstemmed Tidal control of the flow through long, narrow straits: a modeling study for the Seto Inland Sea
title_short Tidal control of the flow through long, narrow straits: a modeling study for the Seto Inland Sea
title_sort tidal control of the flow through long, narrow straits: a modeling study for the seto inland sea
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6715803/
https://www.ncbi.nlm.nih.gov/pubmed/31467292
http://dx.doi.org/10.1038/s41598-019-47090-y
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