A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans
Five different parameterizations of Langmuir turbulence (LT) effect are investigated in a realistic model of the North Atlantic and Arctic using realistic wave forcing from a global wave hindcast. The parameterizations mainly apply an enhancement to the turbulence velocity scale, and/or to the entra...
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ftoslouniv:oai:www.duo.uio.no:10852/75800 2023-05-15T14:28:02+02:00 A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans Ali, Alfatih Christensen, Kai Håkon Breivik, Øyvind Bertino, Laurent Malila, Mika Petteri Raj, Roshin Pappukutty Chassignet, Eric P. Bakhoday Paskyabi, Mostafa 2019-06-14T11:04:18Z http://hdl.handle.net/10852/75800 http://urn.nb.no/URN:NBN:no-78854 https://doi.org/10.1016/j.ocemod.2019.02.005 EN eng NOTUR/NORSTORE/NN9481k NOTUR/NORSTORE/NS9481k NFR/237906 (CIRFA) NFR/244262 (RETROSPECT) COPERNICUS/CMEMS ARC-MFC COPERNICUS/CMEMS WaveFlow http://urn.nb.no/URN:NBN:no-78854 Ali, Alfatih Christensen, Kai Håkon Breivik, Øyvind Bertino, Laurent Malila, Mika Petteri Raj, Roshin Pappukutty Chassignet, Eric P. Bakhoday Paskyabi, Mostafa . A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans. Ocean Modelling. 2019, 137, 76-97 http://hdl.handle.net/10852/75800 1704909 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Ocean Modelling&rft.volume=137&rft.spage=76&rft.date=2019 Ocean Modelling 137 76 97 https://doi.org/10.1016/j.ocemod.2019.02.005 URN:NBN:no-78854 Fulltext https://www.duo.uio.no/bitstream/handle/10852/75800/2/Breivik19OceanModelling.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 1463-5003 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2019 ftoslouniv https://doi.org/10.1016/j.ocemod.2019.02.005 2020-06-21T08:54:21Z Five different parameterizations of Langmuir turbulence (LT) effect are investigated in a realistic model of the North Atlantic and Arctic using realistic wave forcing from a global wave hindcast. The parameterizations mainly apply an enhancement to the turbulence velocity scale, and/or to the entrainment buoyancy flux in the surface boundary layer. An additional run is also performed with other wave effects to assess the relative importance of Langmuir turbulence, namely the Coriolis-Stokes forcing, Stokes tracer advection and wave-modified momentum fluxes. The default model (without wave effects) underestimates the mixed layer depth in summer and overestimates it at high latitudes in the winter. The results show that adding LT mixing reduces shallow mixed layer depth (MLD) biases, particularly in the subtropics all year-around, and in the Nordic Seas in summer. There is overall a stronger relative impact on the MLD during winter than during summer. In particular, the parameterization with the most vigorous LT effect causes winter MLD increases by more than 50% relative to a control run without Langmuir mixing. On the contrary, the parameterization which assumes LT effects on the entrainment buoyancy flux and accounts for the Stokes penetration depth is able to enhance the mixing in summer more than in winter. This parameterization is also distinct from the others because it restrains the LT mixing in regions of deep MLD biases, so it is the preferred choice for our purpose. The different parameterizations do not change the amplitude or phase of the seasonal cycle of heat content but do influence its long-term trend, which means that the LT can influence the drift of ocean models. The combined impact on water mass properties from the Coriolis-Stokes force, the Stokes drift tracer advection, and the wave-dependent momentum fluxes is negligible compared to the effect from the parameterized Langmuir turbulence. Article in Journal/Newspaper Arctic Arctic Nordic Seas North Atlantic Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Ocean Modelling 137 76 97 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Five different parameterizations of Langmuir turbulence (LT) effect are investigated in a realistic model of the North Atlantic and Arctic using realistic wave forcing from a global wave hindcast. The parameterizations mainly apply an enhancement to the turbulence velocity scale, and/or to the entrainment buoyancy flux in the surface boundary layer. An additional run is also performed with other wave effects to assess the relative importance of Langmuir turbulence, namely the Coriolis-Stokes forcing, Stokes tracer advection and wave-modified momentum fluxes. The default model (without wave effects) underestimates the mixed layer depth in summer and overestimates it at high latitudes in the winter. The results show that adding LT mixing reduces shallow mixed layer depth (MLD) biases, particularly in the subtropics all year-around, and in the Nordic Seas in summer. There is overall a stronger relative impact on the MLD during winter than during summer. In particular, the parameterization with the most vigorous LT effect causes winter MLD increases by more than 50% relative to a control run without Langmuir mixing. On the contrary, the parameterization which assumes LT effects on the entrainment buoyancy flux and accounts for the Stokes penetration depth is able to enhance the mixing in summer more than in winter. This parameterization is also distinct from the others because it restrains the LT mixing in regions of deep MLD biases, so it is the preferred choice for our purpose. The different parameterizations do not change the amplitude or phase of the seasonal cycle of heat content but do influence its long-term trend, which means that the LT can influence the drift of ocean models. The combined impact on water mass properties from the Coriolis-Stokes force, the Stokes drift tracer advection, and the wave-dependent momentum fluxes is negligible compared to the effect from the parameterized Langmuir turbulence. |
format |
Article in Journal/Newspaper |
author |
Ali, Alfatih Christensen, Kai Håkon Breivik, Øyvind Bertino, Laurent Malila, Mika Petteri Raj, Roshin Pappukutty Chassignet, Eric P. Bakhoday Paskyabi, Mostafa |
spellingShingle |
Ali, Alfatih Christensen, Kai Håkon Breivik, Øyvind Bertino, Laurent Malila, Mika Petteri Raj, Roshin Pappukutty Chassignet, Eric P. Bakhoday Paskyabi, Mostafa A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans |
author_facet |
Ali, Alfatih Christensen, Kai Håkon Breivik, Øyvind Bertino, Laurent Malila, Mika Petteri Raj, Roshin Pappukutty Chassignet, Eric P. Bakhoday Paskyabi, Mostafa |
author_sort |
Ali, Alfatih |
title |
A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans |
title_short |
A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans |
title_full |
A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans |
title_fullStr |
A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans |
title_full_unstemmed |
A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans |
title_sort |
comparison of langmuir turbulence parameterizations and key wave effects in a numerical model of the north atlantic and arctic oceans |
publishDate |
2019 |
url |
http://hdl.handle.net/10852/75800 http://urn.nb.no/URN:NBN:no-78854 https://doi.org/10.1016/j.ocemod.2019.02.005 |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Arctic Langmuir |
geographic_facet |
Arctic Langmuir |
genre |
Arctic Arctic Nordic Seas North Atlantic |
genre_facet |
Arctic Arctic Nordic Seas North Atlantic |
op_source |
1463-5003 |
op_relation |
NOTUR/NORSTORE/NN9481k NOTUR/NORSTORE/NS9481k NFR/237906 (CIRFA) NFR/244262 (RETROSPECT) COPERNICUS/CMEMS ARC-MFC COPERNICUS/CMEMS WaveFlow http://urn.nb.no/URN:NBN:no-78854 Ali, Alfatih Christensen, Kai Håkon Breivik, Øyvind Bertino, Laurent Malila, Mika Petteri Raj, Roshin Pappukutty Chassignet, Eric P. Bakhoday Paskyabi, Mostafa . A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans. Ocean Modelling. 2019, 137, 76-97 http://hdl.handle.net/10852/75800 1704909 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Ocean Modelling&rft.volume=137&rft.spage=76&rft.date=2019 Ocean Modelling 137 76 97 https://doi.org/10.1016/j.ocemod.2019.02.005 URN:NBN:no-78854 Fulltext https://www.duo.uio.no/bitstream/handle/10852/75800/2/Breivik19OceanModelling.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.ocemod.2019.02.005 |
container_title |
Ocean Modelling |
container_volume |
137 |
container_start_page |
76 |
op_container_end_page |
97 |
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1766302171923480576 |