Genesis and Decay of Mesoscale Baroclinic Eddies in the Seasonally Ice-Covered Interior Arctic Ocean
| العنوان: | Genesis and Decay of Mesoscale Baroclinic Eddies in the Seasonally Ice-Covered Interior Arctic Ocean |
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| المؤلفون: | Gianluca Meneghello, Heather Regan, Pål Erik Isachsen, Edward W. Doddridge, Claude Talandier, Camille Lique, Jean-Michel Campin, John Marshall |
| المصدر: | Journal Of Physical Oceanography (0022-3670) (American Meteorological Society), 2021-01, Vol. 51, N. 1, P. 115-129 |
| بيانات النشر: | American Meteorological Society, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, 010505 oceanography, Baroclinity, Ocean current, Mesoscale meteorology, Halocline, Oceanography, 01 natural sciences, Ocean dynamics, Arctic, Quasigeostrophic models, Ocean circulation, In situ oceanic observations, 13. Climate action, Potential vorticity, Sea ice, Eddies, Geology, Baroclinic flows, 0105 earth and related environmental sciences |
| الوصف: | Observations of ocean currents in the Arctic interior show a curious, and hitherto unexplained, vertical and temporal distribution of mesoscale activity. A marked seasonal cycle is found close to the surface: strong eddy activity during summer, observed from both satellites and moorings, is followed by very quiet winters. In contrast, subsurface eddies persist all year long within the deeper halocline and below. Informed by baroclinic instability analysis, we explore the origin and evolution of mesoscale eddies in the seasonally ice-covered interior Arctic Ocean. We find that the surface seasonal cycle is controlled by friction with sea ice, dissipating existing eddies and preventing the growth of new ones. In contrast, subsurface eddies, enabled by interior potential vorticity gradients and shielded by a strong stratification at a depth of approximately 50 m, can grow independently of the presence of sea ice. A high-resolution pan-Arctic ocean model confirms that the interior Arctic basin is baroclinically unstable all year long at depth. We address possible implications for the transport of water masses between the margins and the interior of the Arctic basin, and for climate models’ ability to capture the fundamental difference in mesoscale activity between ice-covered and ice-free regions. |
| وصف الملف: | application/pdf |
| تدمد: | 1520-0485 0022-3670 |
| DOI: | 10.1175/jpo-d-20-0054.1 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87b0847688f3db0c877dfb967147a9f6 https://doi.org/10.1175/jpo-d-20-0054.1 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....87b0847688f3db0c877dfb967147a9f6 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15200485 00223670 |
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| DOI: | 10.1175/jpo-d-20-0054.1 |