Upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the MOSAiC drift
Sea ice mediates the transfer of momentum, heat, and gas between the atmosphere and ocean. However, the under-ice boundary layer is not sufficiently constrained by observations. During the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC), we collected profiles in t...
Published in: | Journal of Geophysical Research: Oceans |
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American Geophysical Union
2022
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Online Access: | https://hdl.handle.net/11250/3017663 https://doi.org/10.1029/2022JC018751 |
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ftunivbergen:oai:bora.uib.no:11250/3017663 2023-05-15T13:22:44+02:00 Upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the MOSAiC drift Fer, Ilker Baumann, Till Martin Koenig, Zoe Charlotte Muilwijk, Morven Tippenhauer, Sandra 2022 application/pdf https://hdl.handle.net/11250/3017663 https://doi.org/10.1029/2022JC018751 eng eng American Geophysical Union https://doi.pangaea.de/10.1594/PANGAEA.946076 Norges forskningsråd: 294396 urn:issn:2169-9275 https://hdl.handle.net/11250/3017663 https://doi.org/10.1029/2022JC018751 cristin:2046639 Journal of Geophysical Research (JGR): Oceans. 2022, 127, e2022JC018751. Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no Copyright 2022 the authors e2022JC018751 Journal of Geophysical Research (JGR): Oceans 127 VDP::Oseanografi: 452 VDP::Oceanography: 452 Journal article Peer reviewed 2022 ftunivbergen https://doi.org/10.1029/2022JC018751 2023-03-14T17:43:55Z Sea ice mediates the transfer of momentum, heat, and gas between the atmosphere and ocean. However, the under-ice boundary layer is not sufficiently constrained by observations. During the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC), we collected profiles in the upper 50-80 m using a new ascending vertical microstructure profiler, resolving the turbulent structure within 1 m to the ice. We analyzed 167 dissipation rate profiles collected between February and mid-September 2020, from 89°N to 79°30′N through the Amundsen Basin, Nansen Basin, Yermak Plateau, and Fram Strait. Measurements covered a broad range of forcing (0–15 m s−1 wind and 0–0.4 m s−1 drift speeds) and sea ice conditions (pack ice, thin ice, and leads). Dissipation rates varied by over 4 orders of magnitude from 10−9 W kg−1 below 40 m to above 10−5 W kg−1 at 1 m. Following wind events, layers with dissipation urn:x-wiley:21699275:media:jgrc25172:jgrc25172-math-0001 W kg−1 extended down to 20 m depth under pack ice. In leads in the central Arctic, turbulence was enhanced 2 to 10 times relative to thin ice profiles. Under-ice dissipation profiles allowed us to estimate the boundary layer thickness (4±2 m), and the friction velocity (1–15 mm s−1, 4.7 mm s−1 on average). A representative range of drag coefficient for the MOSAiC sampling site was estimated to (4–6) × 10−3, which is a typical value for Arctic floe observations. The average ratio of drift speed to wind speed was close to the free-drift ratio of 2% with no clear seasonal or regional variability. publishedVersion Article in Journal/Newspaper amundsen basin Arctic Fram Strait Nansen Basin Sea ice Yermak plateau University of Bergen: Bergen Open Research Archive (BORA-UiB) Amundsen Basin ENVELOPE(74.000,74.000,87.000,87.000) Arctic Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) Journal of Geophysical Research: Oceans 127 9 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Oseanografi: 452 VDP::Oceanography: 452 |
spellingShingle |
VDP::Oseanografi: 452 VDP::Oceanography: 452 Fer, Ilker Baumann, Till Martin Koenig, Zoe Charlotte Muilwijk, Morven Tippenhauer, Sandra Upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the MOSAiC drift |
topic_facet |
VDP::Oseanografi: 452 VDP::Oceanography: 452 |
description |
Sea ice mediates the transfer of momentum, heat, and gas between the atmosphere and ocean. However, the under-ice boundary layer is not sufficiently constrained by observations. During the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC), we collected profiles in the upper 50-80 m using a new ascending vertical microstructure profiler, resolving the turbulent structure within 1 m to the ice. We analyzed 167 dissipation rate profiles collected between February and mid-September 2020, from 89°N to 79°30′N through the Amundsen Basin, Nansen Basin, Yermak Plateau, and Fram Strait. Measurements covered a broad range of forcing (0–15 m s−1 wind and 0–0.4 m s−1 drift speeds) and sea ice conditions (pack ice, thin ice, and leads). Dissipation rates varied by over 4 orders of magnitude from 10−9 W kg−1 below 40 m to above 10−5 W kg−1 at 1 m. Following wind events, layers with dissipation urn:x-wiley:21699275:media:jgrc25172:jgrc25172-math-0001 W kg−1 extended down to 20 m depth under pack ice. In leads in the central Arctic, turbulence was enhanced 2 to 10 times relative to thin ice profiles. Under-ice dissipation profiles allowed us to estimate the boundary layer thickness (4±2 m), and the friction velocity (1–15 mm s−1, 4.7 mm s−1 on average). A representative range of drag coefficient for the MOSAiC sampling site was estimated to (4–6) × 10−3, which is a typical value for Arctic floe observations. The average ratio of drift speed to wind speed was close to the free-drift ratio of 2% with no clear seasonal or regional variability. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Fer, Ilker Baumann, Till Martin Koenig, Zoe Charlotte Muilwijk, Morven Tippenhauer, Sandra |
author_facet |
Fer, Ilker Baumann, Till Martin Koenig, Zoe Charlotte Muilwijk, Morven Tippenhauer, Sandra |
author_sort |
Fer, Ilker |
title |
Upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the MOSAiC drift |
title_short |
Upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the MOSAiC drift |
title_full |
Upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the MOSAiC drift |
title_fullStr |
Upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the MOSAiC drift |
title_full_unstemmed |
Upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the MOSAiC drift |
title_sort |
upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the mosaic drift |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3017663 https://doi.org/10.1029/2022JC018751 |
long_lat |
ENVELOPE(74.000,74.000,87.000,87.000) ENVELOPE(5.000,5.000,81.250,81.250) |
geographic |
Amundsen Basin Arctic Yermak Plateau |
geographic_facet |
Amundsen Basin Arctic Yermak Plateau |
genre |
amundsen basin Arctic Fram Strait Nansen Basin Sea ice Yermak plateau |
genre_facet |
amundsen basin Arctic Fram Strait Nansen Basin Sea ice Yermak plateau |
op_source |
e2022JC018751 Journal of Geophysical Research (JGR): Oceans 127 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.946076 Norges forskningsråd: 294396 urn:issn:2169-9275 https://hdl.handle.net/11250/3017663 https://doi.org/10.1029/2022JC018751 cristin:2046639 Journal of Geophysical Research (JGR): Oceans. 2022, 127, e2022JC018751. |
op_rights |
Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no Copyright 2022 the authors |
op_doi |
https://doi.org/10.1029/2022JC018751 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
9 |
_version_ |
1766366691069001728 |