Validating Finescale Parameterizations for the Eastern Arctic Ocean Internal Wave Field
In the Arctic Ocean, vertical transport of heat by turbulent mixing is ultimately coupled to the sea-ice cover, with immediate and far-reaching impacts on the climate and ecosystem. Unfortunately, direct observations of mixing are difficult, expensive and sparse. Finescale Parameterization (FS) of t...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hdl.handle.net/11250/3130750 https://doi.org/10.1029/2022JC018668 |
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ftunivbergen:oai:bora.uib.no:11250/3130750 2024-06-23T07:49:44+00:00 Validating Finescale Parameterizations for the Eastern Arctic Ocean Internal Wave Field Baumann, Till Martin Fer, Ilker Schulz, Kirstin Mohrholz, Volker 2023 application/pdf https://hdl.handle.net/11250/3130750 https://doi.org/10.1029/2022JC018668 eng eng American Geophysical Union urn:issn:2169-9275 https://hdl.handle.net/11250/3130750 https://doi.org/10.1029/2022JC018668 cristin:2201043 Journal of Geophysical Research (JGR): Oceans. 2023, 128 (11), e2022JC018668. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2023 the authors e2022JC018668 Journal of Geophysical Research (JGR): Oceans 128 11 Journal article Peer reviewed 2023 ftunivbergen https://doi.org/10.1029/2022JC018668 2024-05-29T00:02:42Z In the Arctic Ocean, vertical transport of heat by turbulent mixing is ultimately coupled to the sea-ice cover, with immediate and far-reaching impacts on the climate and ecosystem. Unfortunately, direct observations of mixing are difficult, expensive and sparse. Finescale Parameterization (FS) of turbulent energy dissipation rate (ɛ) allows for the quantification of turbulence from breaking internal waves using standard measurements, such as profiles of hydrography and velocity. While FS proved to be reliable in mid-latitudes, the Arctic Ocean internal wave field is distinct in terms of composition and energy level, rendering the applicability of FS uncertain. To test FS in a wide range of eastern Arctic conditions, we compiled data from eight cruises. All profiles used to calculate FS were collocated with in-situ measurements of ɛ obtained from microstructure profilers. FS was applied between 50 and 450 m below the surface. Results show a satisfactory performance of FS, with 84% of FS-derived ɛ being within a factor of 5 to observations. This improved to 90% when using lower-noise velocity profiles of lowered current meters instead of ship-mounted current meters. In our data, FS performance is independent of the shear-strain ratio (Rω) and internal wave field bandwidth (N/f), but there is evidence that highly stratified environments with large potential energy, low turbulence and substantially non-white shear spectra are less suitable for FS. A widely used formulation of FS using only hydrography and a prescribed Rω = 7 results in 73% of FS estimates being within a factor of 5 to observations. publishedVersion Article in Journal/Newspaper Arctic Arctic Ocean Sea ice University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Arctic Ocean Journal of Geophysical Research: Oceans 128 11 |
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Open Polar |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
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ftunivbergen |
language |
English |
description |
In the Arctic Ocean, vertical transport of heat by turbulent mixing is ultimately coupled to the sea-ice cover, with immediate and far-reaching impacts on the climate and ecosystem. Unfortunately, direct observations of mixing are difficult, expensive and sparse. Finescale Parameterization (FS) of turbulent energy dissipation rate (ɛ) allows for the quantification of turbulence from breaking internal waves using standard measurements, such as profiles of hydrography and velocity. While FS proved to be reliable in mid-latitudes, the Arctic Ocean internal wave field is distinct in terms of composition and energy level, rendering the applicability of FS uncertain. To test FS in a wide range of eastern Arctic conditions, we compiled data from eight cruises. All profiles used to calculate FS were collocated with in-situ measurements of ɛ obtained from microstructure profilers. FS was applied between 50 and 450 m below the surface. Results show a satisfactory performance of FS, with 84% of FS-derived ɛ being within a factor of 5 to observations. This improved to 90% when using lower-noise velocity profiles of lowered current meters instead of ship-mounted current meters. In our data, FS performance is independent of the shear-strain ratio (Rω) and internal wave field bandwidth (N/f), but there is evidence that highly stratified environments with large potential energy, low turbulence and substantially non-white shear spectra are less suitable for FS. A widely used formulation of FS using only hydrography and a prescribed Rω = 7 results in 73% of FS estimates being within a factor of 5 to observations. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Baumann, Till Martin Fer, Ilker Schulz, Kirstin Mohrholz, Volker |
spellingShingle |
Baumann, Till Martin Fer, Ilker Schulz, Kirstin Mohrholz, Volker Validating Finescale Parameterizations for the Eastern Arctic Ocean Internal Wave Field |
author_facet |
Baumann, Till Martin Fer, Ilker Schulz, Kirstin Mohrholz, Volker |
author_sort |
Baumann, Till Martin |
title |
Validating Finescale Parameterizations for the Eastern Arctic Ocean Internal Wave Field |
title_short |
Validating Finescale Parameterizations for the Eastern Arctic Ocean Internal Wave Field |
title_full |
Validating Finescale Parameterizations for the Eastern Arctic Ocean Internal Wave Field |
title_fullStr |
Validating Finescale Parameterizations for the Eastern Arctic Ocean Internal Wave Field |
title_full_unstemmed |
Validating Finescale Parameterizations for the Eastern Arctic Ocean Internal Wave Field |
title_sort |
validating finescale parameterizations for the eastern arctic ocean internal wave field |
publisher |
American Geophysical Union |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3130750 https://doi.org/10.1029/2022JC018668 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice |
genre_facet |
Arctic Arctic Ocean Sea ice |
op_source |
e2022JC018668 Journal of Geophysical Research (JGR): Oceans 128 11 |
op_relation |
urn:issn:2169-9275 https://hdl.handle.net/11250/3130750 https://doi.org/10.1029/2022JC018668 cristin:2201043 Journal of Geophysical Research (JGR): Oceans. 2023, 128 (11), e2022JC018668. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2023 the authors |
op_doi |
https://doi.org/10.1029/2022JC018668 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
128 |
container_issue |
11 |
_version_ |
1802640409269108736 |