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  • 1
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    Online Resource
    Platelet ice and the land-fast sea ice of McMurdo Sound, Antarctica
    International Glaciological Society ; 2001
    In:  Annals of Glaciology Vol. 33 ( 2001), p. 21-27
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 33 ( 2001), p. 21-27
    Abstract: Dendritic crystals of platelet ice appear beneath the columnar land-fast sea ice of McMurdo Sound, Antarctica. These leaf-like crystals are frozen into place by the advancing columnar growth. The platelets most probably begin to appear during July although in some parts of the Sound they may not appear at all. In addition, the amount and extent of platelet ice within the Sound varies from year to year. Previous authors have suggested that the formation of platelet ice is linked to the presence of the nearby ice shelf. It is a matter of debate whether these platelets form at depth and then float upwards or whether they grow in slightly supercooled water at the ice/water interface. The phenomenon is similar to that observed in the Weddell Sea region, but previous authors have suggested the two regions may experience different processes. This paper presents the results of field-work conducted in McMurdo Sound in 1999. Ice-structure analysis, isotopic analysis and salinity and temperature measurements near the ice/water interface are presented. Freezing points are calculated, and the possible existence of supercooling is discussed in relation to existing conjectures about the origin of platelets.
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.3189/172756401781818365
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 2001
    detail.hit.zdb_id: 2122400-6
    SSG: 14
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  • 2
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    Online Resource
    Long Barotropic Waves Generated by a Storm Crossing Topography
    American Meteorological Society ; 2007
    In:  Journal of Physical Oceanography Vol. 37, No. 12 ( 2007-12-01), p. 2809-2823
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 37, No. 12 ( 2007-12-01), p. 2809-2823
    Abstract: Storms crossing topography are shown to radiate long surface gravity waves. The waves are transients generated by changes in the depth-dependent amplitude of the atmospherically forced pressure wave beneath a storm. This generation mechanism for long waves, known as “meteorological tsunamis” or rissaga, does not appear to have been previously discussed. The transients have periods equal to the passage time of the storm, of order 30 min for small fast-moving storms. A 1D model is used to give the amplitudes of the transient waves generated by a small fast-moving storm crossing a topographic step on to a continental shelf and across a ridge. Large transients are generated by storms whose translation speed is subcritical in deep water and supercritical in shallow water, that is, faster than the shallow-water wave speed. Surprisingly, when the depth difference between the deep water and the continental shelf is large, a gentle transition from deep to shallow water over 10 storm widths only slightly reduces the amplitudes of the transients. The influence of a finite-width shelf on the enhancement of coastal storm surge is also discussed. A 2D numerical model illustrates the topographic transients generated by sub- and supercritical storms moving across a ridge. Topographic transients are suggested as a source of energy for seiches on shelves and within embayments. The energy may come from a storm crossing the adjacent continental slope and possibly from distant open-ocean storms crossing multiple ridges and seamounts.
    Type of Medium: Online Resource
    ISSN: 1520-0485 , 0022-3670
    URL: Article
    DOI: 10.1175/2007JPO3687.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2007
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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  • 3
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    Online Resource
    ADCP Measurements of Momentum Balance and Dynamic Topography in a Constricted Tidal Channel
    American Meteorological Society ; 2006
    In:  Journal of Physical Oceanography Vol. 36, No. 2 ( 2006-02-01), p. 177-188
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 36, No. 2 ( 2006-02-01), p. 177-188
    Abstract: The dynamics of tidal flow through inlets are not fully understood; observations are scarce because of the small spatial scales over which the flow varies. This paper gives the first detailed measurements of the 2D structure of tidal currents and the dynamical terms of the momentum equation within a tidal inlet, leading to an improved understanding of the physics of tidal inlets. In the 180 cm s−1 peak flow the near-steady-state momentum balance is dominated by horizontal advection and the pressure gradient, with bottom friction playing a secondary role. At slack water, there is a balance between local acceleration and the pressure gradient. Numerical integration of the ADCP-measured terms in the momentum equation yields 60-m- resolution dynamic topography that shows a 7-cm variation at peak flood consistent with Bernoulli’s equation. The surface topography because of friction forms a linear ramp with a peak irreversible head loss of 2 cm over 600 m. Tidal velocities were extracted from the ADCP measurements by extending an existing spline analysis technique. This technique is known to be sensitive to the number and location of the nodes where weights are applied to the spline. Simulations with artificial data representative of the tidally varying ADCP measurements show that, provided there are sufficient nodes to resolve the smallest spatial scale of interest, velocities predicted by the spline technique are insensitive to the number or locations of the nodes.
    Type of Medium: Online Resource
    ISSN: 1520-0485 , 0022-3670
    URL: Article
    DOI: 10.1175/JPO2836.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2006
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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  • 4
    Online Resource
    Online Resource
    Evolution of supercooling under coastal Antarctic sea ice during winter
    Cambridge University Press (CUP) ; 2011
    In:  Antarctic Science Vol. 23, No. 4 ( 2011-08), p. 399-409
    Details
    In: Antarctic Science, Cambridge University Press (CUP), Vol. 23, No. 4 ( 2011-08), p. 399-409
    Abstract: Here we describe the evolution through winter of a layer of in situ supercooled water beneath the sea ice at a site close to the McMurdo Ice Shelf. From early winter (May), the temperature of the upper water column was below its surface freezing point, implying contact with an ice shelf at depth. By late winter the supercooled layer was c . 40 m deep with a maximum supercooling of c . 25 mK located 1–2 m below the sea ice-water interface. Transitory in situ supercooling events were also observed, one lasting c . 17 hours and reaching a depth of 70 m. In spite of these very low temperatures the isotopic composition of the water was relatively heavy, suggesting little glacial melt. Further, the water's temperature-salinity signature indicates contributions to water mass properties from High Salinity Shelf Water produced in areas of high sea ice production to the north of McMurdo Sound. Our measurements imply the existence of a heat sink beneath the supercooled layer that extracts heat from the ocean to thicken and cool this layer and contributes to the thickness of the sea ice cover. This sink is linked to the circulation pattern of the McMurdo Sound.
    Type of Medium: Online Resource
    ISSN: 0954-1020 , 1365-2079
    URL: Article
    DOI: 10.1017/S0954102011000265
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2011
    detail.hit.zdb_id: 2104104-0
    detail.hit.zdb_id: 1009128-2
    SSG: 12
    SSG: 13
    SSG: 14
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  • 5
    Online Resource
    Online Resource
    Oscillating Barotropic Currents along Short Channels
    American Meteorological Society ; 1998
    In:  Journal of Physical Oceanography Vol. 28, No. 8 ( 1998-08), p. 1561-1569
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 28, No. 8 ( 1998-08), p. 1561-1569
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/1520-0485(1998)028〈1561:OBCASC〉2.0.CO;2
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 1998
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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  • 6
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    Online Resource
    Divergence-Free Spatial Velocity Flow Field Interpolator for Improving Measurements from ADCP-Equipped Small Unmanned Underwater Vehicles
    American Meteorological Society ; 2012
    In:  Journal of Atmospheric and Oceanic Technology Vol. 29, No. 3 ( 2012-03-01), p. 478-484
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 29, No. 3 ( 2012-03-01), p. 478-484
    Abstract: Applying a two-dimensional (2D) divergence-free (DF) interpolation to a one-person deployable unmanned underwater vehicle’s (UUV) noisy moving-vessel acoustic Doppler current profiler (MV-ADCP) measurements improves the results and increases the utility of the UUV in tidal environments. For a 3.5-h MV-ACDP simulation that spatially and temporally varies with the M2 tide, the 2D DF-estimated velocity magnitude and orientation improves by approximately 85%. Next the 2D DF method was applied to velocity data obtained from two UUVs that repeatedly performed seven 1-h survey tracks in Bear Cut Inlet, Miami, Florida. The DF method provides a more realistic and consistent representation of the ADCP measured flow field, improving magnitude and orientation estimates by approximately 25%. The improvement increases for lower flow velocities, when the ADCP measurements have low environmental signal-to-noise ratio. However, near slack tide when flow reversal occurs, the DF estimates are invalid because the flows are not steady state within the survey circuit.
    Type of Medium: Online Resource
    ISSN: 0739-0572 , 1520-0426
    URL: Article
    DOI: 10.1175/JTECH-D-11-00084.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2012
    detail.hit.zdb_id: 2021720-1
    detail.hit.zdb_id: 48441-6
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  • 7
    Online Resource
    Online Resource
    Acoustic Doppler Current Profiler measurements of the semi‐diurnal internal tide on the west coast of New Zealand
    Informa UK Limited ; 1993
    In:  New Zealand Journal of Marine and Freshwater Research Vol. 27, No. 1 ( 1993-03), p. 31-38
    Details
    In: New Zealand Journal of Marine and Freshwater Research, Informa UK Limited, Vol. 27, No. 1 ( 1993-03), p. 31-38
    Type of Medium: Online Resource
    ISSN: 0028-8330 , 1175-8805
    URL: Article
    DOI: 10.1080/00288330.1993.9516543
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 1993
    detail.hit.zdb_id: 2098792-4
    detail.hit.zdb_id: 415636-5
    SSG: 12
    SSG: 21,3
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  • 8
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    A new multi-object tracking pipeline based on computer vision techniques for mussel farms
    Informa UK Limited ; 2023
    In:  Journal of the Royal Society of New Zealand
    Details
    In: Journal of the Royal Society of New Zealand, Informa UK Limited
    Type of Medium: Online Resource
    ISSN: 0303-6758 , 1175-8899
    URL: Article
    DOI: 10.1080/03036758.2023.2240466
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2023
    detail.hit.zdb_id: 2098960-X
    SSG: 11
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  • 9
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    Online Resource
    Observations of momentum advection due to secondary circulation in a curved tidal channel
    Informa UK Limited ; 2021
    In:  Journal of the Royal Society of New Zealand Vol. 51, No. 2 ( 2021-04-03), p. 272-289
    Details
    In: Journal of the Royal Society of New Zealand, Informa UK Limited, Vol. 51, No. 2 ( 2021-04-03), p. 272-289
    Type of Medium: Online Resource
    ISSN: 0303-6758 , 1175-8899
    URL: Article
    DOI: 10.1080/03036758.2020.1825001
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2098960-X
    SSG: 11
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  • 10
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    Online Resource
    Prediction of fluid forces acting on a hand model in unsteady flow conditions
    Elsevier BV ; 2008
    In:  Journal of Biomechanics Vol. 41, No. 5 ( 2008), p. 1131-1136
    Details
    In: Journal of Biomechanics, Elsevier BV, Vol. 41, No. 5 ( 2008), p. 1131-1136
    Type of Medium: Online Resource
    ISSN: 0021-9290
    URL: Article
    DOI: 10.1016/j.jbiomech.2007.12.007
    RVK:
    WA 15000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2008
    detail.hit.zdb_id: 1498351-5
    SSG: 12
    SSG: 31
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