The tidal effects in the Finite-volumE Sea ice–Ocean Model (FESOM2.1): a comparison between parameterised tidal mixing and explicit tidal forcing
Tides are proved to have a significant effect on the ocean and climate. Previous modelling research either adds a tidal mixing parameterisation or an explicit tidal forcing to the ocean models. However, no research compares the two approaches in the same framework. Here we implement both schemes int...
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ftcopernicus:oai:publications.copernicus.org:gmdd101007 2023-05-15T14:02:17+02:00 The tidal effects in the Finite-volumE Sea ice–Ocean Model (FESOM2.1): a comparison between parameterised tidal mixing and explicit tidal forcing Song, Pengyang Sidorenko, Dmitry Scholz, Patrick Thomas, Maik Lohmann, Gerrit 2022-01-31 application/pdf https://doi.org/10.5194/gmd-2022-25 https://gmd.copernicus.org/preprints/gmd-2022-25/ eng eng doi:10.5194/gmd-2022-25 https://gmd.copernicus.org/preprints/gmd-2022-25/ eISSN: 1991-9603 Text 2022 ftcopernicus https://doi.org/10.5194/gmd-2022-25 2022-02-07T17:22:17Z Tides are proved to have a significant effect on the ocean and climate. Previous modelling research either adds a tidal mixing parameterisation or an explicit tidal forcing to the ocean models. However, no research compares the two approaches in the same framework. Here we implement both schemes into a general ocean circulation model and assess both methods by comparing the results. The aspects for comparison involve hydrography, sea ice, mixed layer depth, Meridional Overturning Circulation (MOC), vertical diffusivity, barotropic streamfunction and energy diagnostics. We conclude that although the mesh resolution is poor in resolving internal tides in most mid-latitude and shelf-break areas, explicit tidal forcing still shows stronger tidal mixing at the Kuril–Aleutian Ridge and the Indonesian Archipelago than the tidal mixing parameterisation. Beyond that, the explicit tidal forcing method leads to a stronger upper cell of the Atlantic MOC by enhancing the Pacific MOC and the Indonesian Throughflow. Meanwhile, the tidal mixing parameterisation leads to a stronger lower cell of the Atlantic MOC due to the tidal mixing in deep oceans. Both methods maintain the Antarctic Circumpolar Current at a higher level than the control run by increasing the meridional density gradient but with different mechanisms. We also show several phenomena that are not considered in the tidal mixing parameterisation, for example, the changing of energy budgets in the ocean system, the bottom drag induced mixing on the continental shelves, and the sea ice transport by tidal motions. Due to the limit of computational capacity, an internal-tide-resolving simulation is not feasible for climate studies. However, a high-resolution short-term tidal simulation is still required to improve parameters and parameterisation schemes in climate studies. Text Antarc* Antarctic Sea ice Copernicus Publications: E-Journals Aleutian Ridge ENVELOPE(-178.000,-178.000,51.500,51.500) Antarctic Pacific The Antarctic |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Tides are proved to have a significant effect on the ocean and climate. Previous modelling research either adds a tidal mixing parameterisation or an explicit tidal forcing to the ocean models. However, no research compares the two approaches in the same framework. Here we implement both schemes into a general ocean circulation model and assess both methods by comparing the results. The aspects for comparison involve hydrography, sea ice, mixed layer depth, Meridional Overturning Circulation (MOC), vertical diffusivity, barotropic streamfunction and energy diagnostics. We conclude that although the mesh resolution is poor in resolving internal tides in most mid-latitude and shelf-break areas, explicit tidal forcing still shows stronger tidal mixing at the Kuril–Aleutian Ridge and the Indonesian Archipelago than the tidal mixing parameterisation. Beyond that, the explicit tidal forcing method leads to a stronger upper cell of the Atlantic MOC by enhancing the Pacific MOC and the Indonesian Throughflow. Meanwhile, the tidal mixing parameterisation leads to a stronger lower cell of the Atlantic MOC due to the tidal mixing in deep oceans. Both methods maintain the Antarctic Circumpolar Current at a higher level than the control run by increasing the meridional density gradient but with different mechanisms. We also show several phenomena that are not considered in the tidal mixing parameterisation, for example, the changing of energy budgets in the ocean system, the bottom drag induced mixing on the continental shelves, and the sea ice transport by tidal motions. Due to the limit of computational capacity, an internal-tide-resolving simulation is not feasible for climate studies. However, a high-resolution short-term tidal simulation is still required to improve parameters and parameterisation schemes in climate studies. |
format |
Text |
author |
Song, Pengyang Sidorenko, Dmitry Scholz, Patrick Thomas, Maik Lohmann, Gerrit |
spellingShingle |
Song, Pengyang Sidorenko, Dmitry Scholz, Patrick Thomas, Maik Lohmann, Gerrit The tidal effects in the Finite-volumE Sea ice–Ocean Model (FESOM2.1): a comparison between parameterised tidal mixing and explicit tidal forcing |
author_facet |
Song, Pengyang Sidorenko, Dmitry Scholz, Patrick Thomas, Maik Lohmann, Gerrit |
author_sort |
Song, Pengyang |
title |
The tidal effects in the Finite-volumE Sea ice–Ocean Model (FESOM2.1): a comparison between parameterised tidal mixing and explicit tidal forcing |
title_short |
The tidal effects in the Finite-volumE Sea ice–Ocean Model (FESOM2.1): a comparison between parameterised tidal mixing and explicit tidal forcing |
title_full |
The tidal effects in the Finite-volumE Sea ice–Ocean Model (FESOM2.1): a comparison between parameterised tidal mixing and explicit tidal forcing |
title_fullStr |
The tidal effects in the Finite-volumE Sea ice–Ocean Model (FESOM2.1): a comparison between parameterised tidal mixing and explicit tidal forcing |
title_full_unstemmed |
The tidal effects in the Finite-volumE Sea ice–Ocean Model (FESOM2.1): a comparison between parameterised tidal mixing and explicit tidal forcing |
title_sort |
tidal effects in the finite-volume sea ice–ocean model (fesom2.1): a comparison between parameterised tidal mixing and explicit tidal forcing |
publishDate |
2022 |
url |
https://doi.org/10.5194/gmd-2022-25 https://gmd.copernicus.org/preprints/gmd-2022-25/ |
long_lat |
ENVELOPE(-178.000,-178.000,51.500,51.500) |
geographic |
Aleutian Ridge Antarctic Pacific The Antarctic |
geographic_facet |
Aleutian Ridge Antarctic Pacific The Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
eISSN: 1991-9603 |
op_relation |
doi:10.5194/gmd-2022-25 https://gmd.copernicus.org/preprints/gmd-2022-25/ |
op_doi |
https://doi.org/10.5194/gmd-2022-25 |
_version_ |
1766272484847386624 |