dc.contributor.author | Fer, Ilker | |
dc.contributor.author | Baumann, Till Martin | |
dc.contributor.author | Koenig, Zoe Charlotte | |
dc.contributor.author | Muilwijk, Morven | |
dc.contributor.author | Tippenhauer, Sandra | |
dc.date.accessioned | 2022-09-14T06:56:02Z | |
dc.date.available | 2022-09-14T06:56:02Z | |
dc.date.created | 2022-08-29T11:24:32Z | |
dc.date.issued | 2022 | |
dc.identifier.issn | 2169-9275 | |
dc.identifier.uri | https://hdl.handle.net/11250/3017663 | |
dc.description.abstract | 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. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | American Geophysical Union | en_US |
dc.relation.uri | https://doi.pangaea.de/10.1594/PANGAEA.946076 | |
dc.rights | Navngivelse-Ikkekommersiell 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc/4.0/deed.no | * |
dc.title | Upper-ocean turbulence structure and ocean-ice drag coefficient estimates using an ascending microstructure profiler during the MOSAiC drift | en_US |
dc.type | Journal article | en_US |
dc.type | Peer reviewed | en_US |
dc.description.version | publishedVersion | en_US |
dc.rights.holder | Copyright 2022 the authors | en_US |
dc.source.articlenumber | e2022JC018751 | en_US |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |
dc.identifier.doi | https://doi.org/10.1029/2022JC018751 | |
dc.identifier.cristin | 2046639 | |
dc.source.journal | Journal of Geophysical Research (JGR): Oceans | en_US |
dc.relation.project | Norges forskningsråd: 294396 | en_US |
dc.subject.nsi | VDP::Oseanografi: 452 | en_US |
dc.subject.nsi | VDP::Oceanography: 452 | en_US |
dc.identifier.citation | Journal of Geophysical Research (JGR): Oceans. 2022, 127, e2022JC018751. | en_US |
dc.source.volume | 127 | en_US |