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  • 1
    Online Resource
    Online Resource
    Physical Process Cruise 2018
    UiT The Arctic University of Norway ; 2020
    In:  The Nansen Legacy Report Series , No. 2 ( 2020-07-02)
    Details
    In: The Nansen Legacy Report Series, UiT The Arctic University of Norway, , No. 2 ( 2020-07-02)
    Abstract: The cruise KH 2018-709 aboard the Research Vessel Kronprins Haakon was the second process cruise of the project the Nansen Legacy. The cruise contributed to task T1-2, on process studies to investigate the atmospheric, oceanographic, radiative and other physical controls on sea ice and stratification, with a general aim to identify and quantify the processes that control the heat budget north of Svalbard and in the Barents Sea. The cruise aimed to deploy oceanographic moorings and gliders, an AUV, a remotely piloted unmanned aircraft, controlled meteorological balloons, collect underway measurements from ship-mounted ocean current profilers, wind profilers, radiometer and wave sensors, and collect ocean stratification, currents, and microstructure profiles along selected transects across the north Spitsbergen shelf and slope. Additionally, wave sensors were deployed at ice floes from ice edge into pack ice. This report provides an overview of the methods employed and the data collected.
    Type of Medium: Online Resource
    ISSN: 2703-7525
    URL: Issue
    URL: Article
    DOI: 10.7557/nlrs.2020.2
    DOI: 10.7557/nlrs.5503
    Language: Unknown
    Publisher: UiT The Arctic University of Norway
    Publication Date: 2020
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  • 2
    Online Resource
    Online Resource
    Ocean Mixing Process Study 2018
    UiT The Arctic University of Norway ; 2020
    In:  The Nansen Legacy Report Series , No. 1 ( 2020-06-29)
    Details
    In: The Nansen Legacy Report Series, UiT The Arctic University of Norway, , No. 1 ( 2020-06-29)
    Abstract: The cruise KB 2018616 aboard the Research Vessel Kristine Bonnevie was the first research cruise of the Nansen Legacy project. The cruise aimed at collecting ocean stratification, currents, and microstructure profiles along selected transects across the Spitsbergen shelf and slope, thus providing the background for the Kronprins Haakon cruise scheduled in late September 2018. This report provides an overview of the methods employed and the data collected during KB 2018616.
    Type of Medium: Online Resource
    ISSN: 2703-7525
    URL: Issue
    URL: Article
    DOI: 10.7557/nlrs.2020.1
    DOI: 10.7557/nlrs.5504
    Language: Unknown
    Publisher: UiT The Arctic University of Norway
    Publication Date: 2020
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  • 3
    Online Resource
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    SS-MSC2 Process cruise/mooring service 2020
    UiT The Arctic University of Norway ; 2021
    In:  The Nansen Legacy Report Series , No. 20 ( 2021-04-26)
    Details
    In: The Nansen Legacy Report Series, UiT The Arctic University of Norway, , No. 20 ( 2021-04-26)
    Abstract: The cruise GOS 2020113 (6 October 2020 Longyearbyen, 27 October 2020 Tromsø) aboard the Research Vessel G.O. SARS is a mooring service/deployment and process studies cruise of the Nansen LEGACY project. 
    Type of Medium: Online Resource
    ISSN: 2703-7525
    URL: Issue
    URL: Article
    DOI: 10.7557/nlrs.2021.20
    DOI: 10.7557/nlrs.5798
    Language: Unknown
    Publisher: UiT The Arctic University of Norway
    Publication Date: 2021
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  • 4
    Online Resource
    Online Resource
    Adaptive Sampling of Surface Fronts in the Arctic Using an Autonomous Underwater Vehicle
    Institute of Electrical and Electronics Engineers (IEEE) ; 2021
    In:  IEEE Journal of Oceanic Engineering
    Details
    In: IEEE Journal of Oceanic Engineering, Institute of Electrical and Electronics Engineers (IEEE)
    Type of Medium: Online Resource
    ISSN: 0364-9059 , 1558-1691 , 2373-7786
    URL: Journal
    URL: Article
    DOI: 10.1109/JOE.48
    DOI: 10.1109/JOE.2021.3070912
    Language: Unknown
    Publisher: Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2021
    detail.hit.zdb_id: 2025369-2
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  • 5
    Online Resource
    Online Resource
    Microstructure Measurements from an Underwater Glider in the Turbulent Faroe Bank Channel Overflow
    American Meteorological Society ; 2014
    In:  Journal of Atmospheric and Oceanic Technology Vol. 31, No. 5 ( 2014-05), p. 1128-1150
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 31, No. 5 ( 2014-05), p. 1128-1150
    Abstract: Measurements of ocean microstructure are made in the turbulent Faroe Bank Channel overflow using a turbulence instrument attached to an underwater glider. Dissipation rate of turbulent kinetic energy ε is measured using airfoil shear probes. A comparison is made between 152 profiles from dive and climb cycles of the glider during a 1-week mission in June 2012 and 90 profiles collected from the ship using a vertical microstructure profiler (VMP). Approximately one-half of the profiles are collocated. For 96% of the dataset, measurements are of high quality with no systematic differences between dives and climbs. The noise level is less than 5 × 10 −11 W kg −1 , comparable to the best microstructure profilers. The shear probe data are contaminated and unreliable at the turning depth of the glider and for U / u t 〈 20, where U is the flow past the sensor, u t = ( ε / N ) 1/2 is an estimate of the turbulent velocity scale, and N is the buoyancy frequency. Averaged profiles of ε from the VMP and the glider agree to better than a factor of 2 in the turbulent bottom layer of the overflow plume, and beneath the stratified and sheared plume–ambient interface. The glider average values are approximately a factor of 3 and 9 times larger than the VMP values in the layers defined by the isotherms 3°–6° and 6°–9°C, respectively, corresponding to the upper part of the interface and above. The discrepancy is attributed to a different sampling scheme and the intermittency of turbulence. The glider offers a noise-free platform suitable for ocean microstructure measurements.
    Type of Medium: Online Resource
    ISSN: 0739-0572 , 1520-0426
    URL: Article
    DOI: 10.1175/JTECH-D-13-00221.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2014
    detail.hit.zdb_id: 2021720-1
    detail.hit.zdb_id: 48441-6
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  • 6
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    Turbulent Upper-Ocean Mixing Affected by Meltwater Layers during Arctic Summer
    American Meteorological Society ; 2017
    In:  Journal of Physical Oceanography Vol. 47, No. 4 ( 2017-04), p. 835-853
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 47, No. 4 ( 2017-04), p. 835-853
    Abstract: Every summer, intense sea ice melt around the margins of the Arctic pack ice leads to a stratified surface layer, potentially without a traditional surface mixed layer. The associated strengthening of near-surface stratification has important consequences for the redistribution of near-inertial energy, ice–ocean heat fluxes, and vertical replenishment of nutrients required for biological growth. The authors describe the vertical structure of meltwater layers and quantify their seasonal evolution and their effect on turbulent mixing in the oceanic boundary layer by analyzing more than 450 vertical profiles of velocity microstructure in the seasonal ice zone north of Svalbard. The vertical structure of the density profiles can be summarized by an equivalent mixed layer depth h BD , which scales with the depth of the seasonal stratification. As the season progresses and melt rates increase, h BD shoals following a robust pattern, implying stronger vertical stratification, weaker vertical eddy diffusivity, and reduced vertical extent of the mixing layer, which is bounded by h BD . Through most of the seasonal pycnocline, the vertical eddy diffusivity scales inversely with buoyancy frequency ( K ρ ∝ N −1 ). The presence of mobile sea ice alters the magnitude and vertical structure of turbulent mixing primarily through stronger and shallower stratification, and thus vertical eddy diffusivity is greatly reduced under sea ice. This study uses these results to develop a quantitative model of surface layer turbulent mixing during Arctic summer and discuss the impacts of a changing sea ice cover.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/JPO-D-16-0200.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2017
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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  • 7
    Online Resource
    Online Resource
    OceanGliders: A Component of the Integrated GOOS
    Frontiers Media SA ; 2019
    In:  Frontiers in Marine Science Vol. 6 ( 2019-10-2)
    Details
    In: Frontiers in Marine Science, Frontiers Media SA, Vol. 6 ( 2019-10-2)
    Abstract: The OceanGliders program started in 2016 to support active coordination and enhancement of global glider activity. OceanGliders contributes to the international efforts of the Global Ocean Observation System (GOOS) for Climate, Ocean Health, and Operational Services. It brings together marine scientists and engineers operating gliders around the world: (1) to observe the long-term physical, biogeochemical, and biological ocean processes and phenomena that are relevant for societal applications; and, (2) to contribute to the GOOS through real-time and delayed mode data dissemination. The OceanGliders program is distributed across national and regional observing systems and significantly contributes to integrated, multi-scale and multi-platform sampling strategies. OceanGliders shares best practices, requirements, and scientific knowledge needed for glider operations, data collection and analysis. It also monitors global glider activity and supports the dissemination of glider data through regional and global databases, in real-time and delayed modes, facilitating data access to the wider community. OceanGliders currently supports national, regional and global initiatives to maintain and expand the capabilities and application of gliders to meet key global challenges such as improved measurement of ocean boundary currents, water transformation and storm forecast.
    Type of Medium: Online Resource
    ISSN: 2296-7745
    URL: Article
    DOI: 10.3389/fmars.2019.00422
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2019
    detail.hit.zdb_id: 2757748-X
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  • 8
    Online Resource
    Online Resource
    Data Availability Principles and Practice
    American Meteorological Society ; 2020
    In:  Journal of Physical Oceanography Vol. 50, No. 12 ( 2020-12), p. 3377-3378
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 50, No. 12 ( 2020-12), p. 3377-3378
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/JPO-D-20-0266.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2020
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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  • 9
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    Online Resource
    The Generation of Linear and Nonlinear Internal Waves Forced by Subinertial Tides over the Yermak Plateau, Arctic Ocean
    American Meteorological Society ; 2022
    In:  Journal of Physical Oceanography Vol. 52, No. 9 ( 2022-09), p. 2183-2203
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 52, No. 9 ( 2022-09), p. 2183-2203
    Abstract: The propagation of internal waves (IWs) of tidal frequency is inhibited poleward of the critical latitude, where the tidal frequency is equal to the Coriolis frequency ( f ). These subinertial IWs may propagate in the presence of background vorticity, which can reduce rotational effects. Additionally, for strong tidal currents, the isopycnal displacements may evolve into internal solitary waves (ISWs). In this study, wave generation by the subinertial K 1 and M 2 tides over the Yermak Plateau (YP) is modeled to understand the linear response and the conditions necessary for the generation of ISWs. The YP stretches out into Fram Strait, a gateway into the Arctic Ocean for warm Atlantic-origin waters. We consider the K 1 tide for a wide range of tidal amplitudes to understand the IW generation for different forcing. For weak tidal currents, the baroclinic response is predominantly at the second harmonic due to critical slopes. For sufficiently strong diurnal currents, ISWs are generated and their generation is not sensitive to the range of f and stratifications considered. The M 2 tide is subinertial yet the response shows propagating IW beams with frequency just over f . We discuss the propagation of these waves and the influence of variations of f , as a proxy for variations in the background vorticity, on the energy conversion to IWs. An improved understanding of tidal dynamics and IW generation at high latitudes is needed to quantify the magnitude and distribution of turbulent mixing, and its consequences for the changes in ocean circulation, heat content, and sea ice cover in the Arctic Ocean.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/JPO-D-21-0264.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2022
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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  • 10
    Online Resource
    Online Resource
    The Dissipation of Kinetic Energy in the Lofoten Basin Eddy
    American Meteorological Society ; 2018
    In:  Journal of Physical Oceanography Vol. 48, No. 6 ( 2018-06), p. 1299-1316
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 48, No. 6 ( 2018-06), p. 1299-1316
    Abstract: Ocean microstructure, current, and hydrography observations from June 2016 are used to characterize the turbulence structure of the Lofoten Basin eddy (LBE), a long-lived anticyclone in the Norwegian Sea. The LBE had an azimuthal peak velocity of 0.8 m s −1 at 950-m depth and 22-km radial distance from its center and a core relative vorticity reaching −0.7 f ( f is the local Coriolis parameter). When contrasted to a reference station in a relatively quiescent part of the basin, the LBE was significantly turbulent between 750 and 2000 m, exceeding the dissipation rates ε in the reference station by up to two orders of magnitude. Dissipation rates were elevated particularly in the core and at the rim below the swirl velocity maximum, reaching 10 −8 W kg −1 . The sources of energy for the observed turbulence are the background shear (gradient Richardson number less than unity) and the subinertial energy trapped by the negative vorticity of the eddy. Idealized ray-tracing calculations show that the vertical and lateral changes in stratification, shear, and vorticity allow subinertial waves to be trapped within the LBE. Spectral analysis shows increased high-wavenumber clockwise-polarized shear variance in the core and rim regions, consistent with downward-propagating near-inertial waves (vertical wavelengths of order 100 m and energy levels 3 to 10 times the canonical open-ocean level). The energetic packets with a distinct downward energy propagation are typically accompanied with an increase in dissipation levels. Based on these summer observations, the time scale to drain the volume-integrated total energy of the LBE is 14 years.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/JPO-D-17-0244.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2018
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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