Impact of the "Symmetric Instability of the Computational Kind" at mesoscale- and submesoscale-permitting resolutions
International audience The energy- and enstrophy-conserving momentum advection scheme (EEN) used over the last 10 years in NEMO is subject to a spurious numerical instability. This instability, referred to as the Symmetric Instability of the Computational Kind (SICK), arises from a discrete imbalanc...
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03682727 https://doi.org/10.1016/j.ocemod.2017.10.006 |
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ftunivnantes:oai:HAL:insu-03682727v1 2023-05-15T17:35:25+02:00 Impact of the "Symmetric Instability of the Computational Kind" at mesoscale- and submesoscale-permitting resolutions Ducousso, Nicolas Le Sommer, J. Molines, J. -M. Bell, M. Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Université Grenoble Alpes (UGA) 2017 https://hal-insu.archives-ouvertes.fr/insu-03682727 https://doi.org/10.1016/j.ocemod.2017.10.006 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ocemod.2017.10.006 insu-03682727 https://hal-insu.archives-ouvertes.fr/insu-03682727 BIBCODE: 2017OcMod.120.18D doi:10.1016/j.ocemod.2017.10.006 OCEAN MODELLING https://hal-insu.archives-ouvertes.fr/insu-03682727 OCEAN MODELLING, 2017, 120, pp.18-26. ⟨10.1016/j.ocemod.2017.10.006⟩ EEN momentum advection scheme Symmetric Instability of the Computational Kind Model resolution Spurious mixing [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2017 ftunivnantes https://doi.org/10.1016/j.ocemod.2017.10.006 2022-06-29T00:25:15Z International audience The energy- and enstrophy-conserving momentum advection scheme (EEN) used over the last 10 years in NEMO is subject to a spurious numerical instability. This instability, referred to as the Symmetric Instability of the Computational Kind (SICK), arises from a discrete imbalance between the two components of the vector-invariant form of momentum advection. The properties and the method for removing this instability have been documented by Hollingsworth et al. (1983), but the extent to which the SICK may interfere with processes of interest at mesoscale- and submesoscale-permitting resolutions is still unkown. In this paper, the impact of the SICK in realistic ocean model simulations is assessed by comparing model integrations with different versions of the EEN momentum advection scheme. Investigations are undertaken with a global mesoscale-permitting resolution (1/4 °) configuration and with a regional North Atlantic Ocean submesoscale-permitting resolution (1/60 °) configuration. At both resolutions, the instability is found to alter primarily the most energetic current systems, such as equatorial jets, western boundary currents and coherent vortices. The impact of the SICK is found to increase with model resolution with a noticeable impact at mesoscale-permitting resolution and a dramatic impact at submesoscale-permitting resolution. The SICK is shown to distort the normal functioning of current systems, by redirecting the slow energy transfer between balanced motions to a spurious energy transfer to internal inertia-gravity waves and to dissipation. Our results indicate that the SICK is likely to have significantly corrupted NEMO solutions (when run with the EEN scheme) at mesocale-permitting and finer resolutions over the last 10 years. Article in Journal/Newspaper North Atlantic Université de Nantes: HAL-UNIV-NANTES Hollingsworth ENVELOPE(50.367,50.367,-67.250,-67.250) Ocean Modelling 120 18 26 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
EEN momentum advection scheme Symmetric Instability of the Computational Kind Model resolution Spurious mixing [SDU]Sciences of the Universe [physics] |
spellingShingle |
EEN momentum advection scheme Symmetric Instability of the Computational Kind Model resolution Spurious mixing [SDU]Sciences of the Universe [physics] Ducousso, Nicolas Le Sommer, J. Molines, J. -M. Bell, M. Impact of the "Symmetric Instability of the Computational Kind" at mesoscale- and submesoscale-permitting resolutions |
topic_facet |
EEN momentum advection scheme Symmetric Instability of the Computational Kind Model resolution Spurious mixing [SDU]Sciences of the Universe [physics] |
description |
International audience The energy- and enstrophy-conserving momentum advection scheme (EEN) used over the last 10 years in NEMO is subject to a spurious numerical instability. This instability, referred to as the Symmetric Instability of the Computational Kind (SICK), arises from a discrete imbalance between the two components of the vector-invariant form of momentum advection. The properties and the method for removing this instability have been documented by Hollingsworth et al. (1983), but the extent to which the SICK may interfere with processes of interest at mesoscale- and submesoscale-permitting resolutions is still unkown. In this paper, the impact of the SICK in realistic ocean model simulations is assessed by comparing model integrations with different versions of the EEN momentum advection scheme. Investigations are undertaken with a global mesoscale-permitting resolution (1/4 °) configuration and with a regional North Atlantic Ocean submesoscale-permitting resolution (1/60 °) configuration. At both resolutions, the instability is found to alter primarily the most energetic current systems, such as equatorial jets, western boundary currents and coherent vortices. The impact of the SICK is found to increase with model resolution with a noticeable impact at mesoscale-permitting resolution and a dramatic impact at submesoscale-permitting resolution. The SICK is shown to distort the normal functioning of current systems, by redirecting the slow energy transfer between balanced motions to a spurious energy transfer to internal inertia-gravity waves and to dissipation. Our results indicate that the SICK is likely to have significantly corrupted NEMO solutions (when run with the EEN scheme) at mesocale-permitting and finer resolutions over the last 10 years. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Ducousso, Nicolas Le Sommer, J. Molines, J. -M. Bell, M. |
author_facet |
Ducousso, Nicolas Le Sommer, J. Molines, J. -M. Bell, M. |
author_sort |
Ducousso, Nicolas |
title |
Impact of the "Symmetric Instability of the Computational Kind" at mesoscale- and submesoscale-permitting resolutions |
title_short |
Impact of the "Symmetric Instability of the Computational Kind" at mesoscale- and submesoscale-permitting resolutions |
title_full |
Impact of the "Symmetric Instability of the Computational Kind" at mesoscale- and submesoscale-permitting resolutions |
title_fullStr |
Impact of the "Symmetric Instability of the Computational Kind" at mesoscale- and submesoscale-permitting resolutions |
title_full_unstemmed |
Impact of the "Symmetric Instability of the Computational Kind" at mesoscale- and submesoscale-permitting resolutions |
title_sort |
impact of the "symmetric instability of the computational kind" at mesoscale- and submesoscale-permitting resolutions |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03682727 https://doi.org/10.1016/j.ocemod.2017.10.006 |
long_lat |
ENVELOPE(50.367,50.367,-67.250,-67.250) |
geographic |
Hollingsworth |
geographic_facet |
Hollingsworth |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
OCEAN MODELLING https://hal-insu.archives-ouvertes.fr/insu-03682727 OCEAN MODELLING, 2017, 120, pp.18-26. ⟨10.1016/j.ocemod.2017.10.006⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ocemod.2017.10.006 insu-03682727 https://hal-insu.archives-ouvertes.fr/insu-03682727 BIBCODE: 2017OcMod.120.18D doi:10.1016/j.ocemod.2017.10.006 |
op_doi |
https://doi.org/10.1016/j.ocemod.2017.10.006 |
container_title |
Ocean Modelling |
container_volume |
120 |
container_start_page |
18 |
op_container_end_page |
26 |
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1766134579018596352 |