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| Titel |
Turbulence and heat flux observations in the Arctic north of Svalbard |
| VerfasserIn |
Amelie Meyer, Arild Sundfjord, Ilker Fer, Lars Henrik Smedsrud |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127745
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| Publikation (Nr.) |
 EGU/EGU2016-7652.pdf |
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| Zusammenfassung |
| Heat fluxes and mixing between the ocean and the sea ice in the Arctic is fundamental to
understanding the new first year sea ice regime and consequences for regional and global
ocean circulation. Here we present observations collected between January and June 2015
during the Norwegian Young sea Ice (N-ICE2015) campaign in the Arctic Ocean north of
Svalbard.
In January 2015, the Norwegian research vessel Lance was frozen into the ice at 83o.3N
21.5oE. Oceanographic, atmospheric, sea ice, snow and biological data were collected above,
on, and below the ice using R/V Lance as the base for the ice camp that was drifting south
towards the Fram Strait. Over the following six months, four different drifts took place in the
same area, from the Nansen Basin, through the Marginal Ice Zone, to the open
ocean.
Throughout the drifts, the oceanography team collected turbulence measurements to
estimate mixing, heat, salt, and momentum fluxes in the ice-ocean boundary layer and
between the sub-surface warm Atlantic Water layer and the ice-ocean boundary layer close to
freezing point. Water tracer data was collected to map water mass properties, and the
distribution of the Atlantic Water inflow.
Here we present 600 under-ice microstructure profiles spanning five months, from
the deep Nansen Basin to the Yermak Plateau. During this period, several large
atmospheric storms took place, forcing a fast drift of the ice camp. Tides were weak in
the Nansen Basin and strong on the Yermak Plateau. We investigate vertical heat
fluxes between the Atlantic Water layer and the surface mixed layer. Variations in
mixing and heat fluxes are interpreted in terms of atmospheric forcing and regional
topography. |
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