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  • 1
    Online Resource
    Online Resource
    Numerical modelling of ice shelf dynamics
    Cambridge University Press (CUP) ; 1991
    In:  Antarctic Science Vol. 3, No. 2 ( 1991-06), p. 187-195
    Details
    In: Antarctic Science, Cambridge University Press (CUP), Vol. 3, No. 2 ( 1991-06), p. 187-195
    Abstract: By considering the basic stress equations for a unit volume of ice, a set of differential equations describing ice shelf flow is derived. In view of the lack of basal shear stresses at the bottom of ice shelf a model simulation which is restricted to the horizontal dimensions will not imply substantial errors. The model is applied to the Filchner-Ronne Ice Shelf, Antarctica, and model equations are solved in terms of finite differences on a 10 × 10 km grid. Present ice thickness data and boundary conditions, i.e. the balance velocities at the grounding line and strain rates at the ice front are entered as input. Using a non-linear Glen-type flow law (n=3) and a constant depth-averaged flow law parameter, representing an ice temperature of −17°C, a convincing velocity field is derived as a solution of the model equations. The model takes into account restrained flow across ice rumples where sufficient field data are available. A diagnostic run reproducing present velocity magnitudes is followed by two prognostic runs, each representing 2000 years of simulation. Transient ice thickness changes are obtained from solving the mass conservation equation. Two different assumptions concerning basal melting rates demonstrate its importance to ice shelf dynamics. Assumptions are: a) no basal melting, b) basal melting rates (−2m a −1 to +3m a −1 ) as derived from model results and geophysical field data.
    Type of Medium: Online Resource
    ISSN: 0954-1020 , 1365-2079
    URL: Article
    DOI: 10.1017/S0954102091000226
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1991
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  • 2
    Online Resource
    Online Resource
    Ocean circulation and ice‐ocean interaction beneath the Amery Ice Shelf, Antarctica
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Oceans Vol. 106, No. C10 ( 2001-10-15), p. 22383-22399
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 106, No. C10 ( 2001-10-15), p. 22383-22399
    Abstract: Simulations of the ocean dynamics in the cavity under the Amery Ice Shelf, Antarctica, were carried out using a three‐dimensional numerical ocean model. Two different boundary conditions were used to describe the open ocean barotropic exchange at the ice front. The simulations show that the circulation in the ocean cavity is predominantly barotropic and is generally steered by the cavity topography. The circulation is driven by the density gradient in the cavity, which is strongly influenced by the heat and salt fluxes from melting and freezing processes at the ice‐ocean interface, and by the horizontal exchange of heat and salt across the open ocean boundary at the ice front. The interaction at the ice‐ocean interface allows the basal component of the mass loss of the Amery Ice Shelf to be estimated. In the two simulations the computed losses were 5.8 Gt yr −1 and 18.0 Gt yr −1 , values consistent with observations. The bulk of the melting occurred near the southern grounding line of the ice shelf, although substantial melting also occurred in areas where heat transport by horizontal circulation was large. Accretion was restricted to areas where water, from upstream melting, became supercooled as it ascended the ice shelf base.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JC000236
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Ultraviolet fluorescence excitation and emission spectroscopy of marine algae and bacteria
    Elsevier BV ; 1998
    In:  Marine Chemistry Vol. 62, No. 1-2 ( 1998-10), p. 137-156
    Details
    In: Marine Chemistry, Elsevier BV, Vol. 62, No. 1-2 ( 1998-10), p. 137-156
    Type of Medium: Online Resource
    ISSN: 0304-4203
    URL: Article
    DOI: 10.1016/S0304-4203(98)00026-7
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1998
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    detail.hit.zdb_id: 1497339-X
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  • 4
    Online Resource
    Online Resource
    Future sea-level rise due to projected ocean warming beneath the Filchner Ronne Ice Shelf: A coupled model study
    Elsevier BV ; 2015
    In:  Earth and Planetary Science Letters Vol. 431 ( 2015-12), p. 217-224
    Details
    In: Earth and Planetary Science Letters, Elsevier BV, Vol. 431 ( 2015-12), p. 217-224
    Type of Medium: Online Resource
    ISSN: 0012-821X
    URL: Article
    DOI: 10.1016/j.epsl.2015.09.013
    RVK:
    TE 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2015
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  • 5
    Online Resource
    Online Resource
    Ocean circulation beneath Filchner‐Ronne Ice Shelf from three‐dimensional model results
    American Geophysical Union (AGU) ; 1999
    In:  Journal of Geophysical Research: Oceans Vol. 104, No. C7 ( 1999-07-15), p. 15827-15842
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 104, No. C7 ( 1999-07-15), p. 15827-15842
    Abstract: A high‐resolution three‐dimensional ocean circulation model is applied to the cavity beneath Filchner‐Ronne Ice Shelf (FRIS). The model predicts predominantly barotropic currents which form a series of cyclonic gyres in the deep basins and anticyclonic circulations around the islands. The surface circulation can be such that the water moves in the direction of decreasing or increasing ice thicknesses, in the former case leading to freezing, while melting at the ice shelf base results in the latter case. The pattern of melting and freezing is consistent with known distributions of marine ice and melting areas beneath FRIS. An anticyclonic circulation around the Korff and Henry Ice Rises with melting west of Korff Ice Rise and freezing on the eastern side and north of Henry Ice Rise is the main source for an ice‐pumping mechanism that produces the observed large marine ice body in the central Filchner‐Ronne Ice Shelf. The estimates for net melting for realistic conditions at the open ocean boundary are 40–50 km 3 yr −1 , indicating that ice shelf‐ocean interaction is an important contribution to the mass balance of the ice shelf.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/1999JC900053
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1999
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    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
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    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Twenty-first-century warming of a large Antarctic ice-shelf cavity by a redirected coastal current
    Springer Science and Business Media LLC ; 2012
    In:  Nature Vol. 485, No. 7397 ( 2012-5), p. 225-228
    Details
    In: Nature, Springer Science and Business Media LLC, Vol. 485, No. 7397 ( 2012-5), p. 225-228
    Type of Medium: Online Resource
    ISSN: 0028-0836 , 1476-4687
    URL: Article
    DOI: 10.1038/nature11064
    RVK:
    TA 1000
    RVK:
    UA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2012
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    detail.hit.zdb_id: 1413423-8
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  • 7
    Online Resource
    Online Resource
    Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study
    International Glaciological Society ; 2012
    In:  Annals of Glaciology Vol. 53, No. 60 ( 2012), p. 129-135
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 53, No. 60 ( 2012), p. 129-135
    Abstract: Ice flow from the ice sheets to the ocean contains the maximum potential contributing to future eustatic sea-level rise. In Antarctica most mass fluxes occur via the extended ice-shelf regions covering more than half the Antarctic coastline. The most extended ice shelves are the Filchner–Ronne and Ross Ice Shelves, which contribute ~30% to the total mass loss caused by basal melting. Basal melt rates here show small to moderate average amplitudes of 〈 0.5ma –1 . By comparison, the smaller but most vulnerable ice shelves in the Amundsen and Bellinghausen Seas show much higher melt rates (up to 30 ma –1 ), but overall basal mass loss is comparably small due to the small size of the ice shelves. The pivotal question for both characteristic ice-shelf regions, however, is the impact of ocean melting, and, coevally, change in ice-shelf thickness, on the flow dynamics of the hinterland ice masses. In theory, ice-shelf back-pressure acts to stabilize the ice sheet, and thus the ice volume stored above sea level. We use the three-dimensional (3-D) thermomechanical ice-flow model RIMBAY to investigate the ice flow in a regularly shaped model domain, including ice-sheet, ice-shelf and open-ocean regions. By using melting scenarios for perturbation studies, we find a hysteresis-like behaviour. The experiments show that the system regains its initial state when perturbations are switched off. Average basal melt rates of up to 2 ma –1 as well as spatially variable melting calculated by our 3-D ocean model ROMBAX act as basal boundary conditions in time-dependent model studies. Changes in ice volume and grounding-line position are monitored after 1000 years of modelling and reveal mass losses of up to 40 Gt a –1 .
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.3189/2012AoG60A170
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 2012
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  • 8
    Online Resource
    Online Resource
    Borehole evidence for a thick layer of basal ice in the central Ronne Ice Shelf
    Springer Science and Business Media LLC ; 1987
    In:  Nature Vol. 327, No. 6120 ( 1987-5), p. 318-319
    Details
    In: Nature, Springer Science and Business Media LLC, Vol. 327, No. 6120 ( 1987-5), p. 318-319
    Type of Medium: Online Resource
    ISSN: 0028-0836 , 1476-4687
    URL: Article
    DOI: 10.1038/327318a0
    RVK:
    TA 1000
    RVK:
    UA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1987
    detail.hit.zdb_id: 120714-3
    detail.hit.zdb_id: 1413423-8
    SSG: 11
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