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  • Articles  (6)
  • American Geophysical Union  (3)
  • Wiley  (2)
  • Cambridge University Press  (1)
  • ZBW - Deutsche Zentralbibliothek für Wirtschaftswissenschaften, Leibniz-Informationszentrum Wirtschaft Kiel, Hamburg
  • 2010-2014  (6)
  • 1
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    Simulated heat flux and sea ice production at coastal polynyas in the southwestern Weddell Sea (2013)
    Wiley
    Details
    Publication Date: 2013-03-19
    Description: [1]  Coastal polynyas are areas in an ice-covered ocean where the ice cover is exported, mostly by off-shore winds. The resulting reduction of sea ice enables an enhanced ocean–atmosphere heat transfer. Once the water temperatures are at the freezing point, further heat loss induces sea ice production. The heat exchange and ice production in coastal polynyas in the southwestern Weddell Sea is addressed using the Finite-Element Sea-ice Ocean Model, a primitive-equation, hydrostatic ocean circulation model coupled with a dynamicthermodynamic sea-ice model, which allows to quantify the amount of heat associated with cooling of the water column. Three important polynya regions are identified: at Brunt Ice Shelf, at Ronne Ice Shelf and along the southern part of the Antarctic Peninsula. Multiyear winter means (May-September 1990–2009) give an upward heat flux to the atmosphere of 311 W/m 2 in the Brunt polynyas, 511 W/m 2 in Ronne Polynya and 364 W/m 2 in the Antarctic Peninsula polynyas, whereof 57 W/m 2 , 49 W/m 2 and 48 W/m 2 , respectively, are supplied as oceanic heat flux from deeper layers. The mean winter sea ice production is 7.2 cm/d in the Brunt polynyas corresponding to an ice volume of 1.3 · 10 10   m 3 /winter, 13.2 cm/d at Ronne polynya (4.4 · 10 10   m 3 /winter), and 9.2 cm/d in the Antarctic Peninsula polynyas (2.1 · 10 10   m 3 /winter. The heat flux to the atmosphere inside polynyas is 7 to 9 times higher than the heat flux in the adjacent area; polynya ice production per unit area exceeds adjacent values by a factor of 9 to 14.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    Sea ice motion and open water area at the Ronne Polynia, Antarctica: SAR observations vs. model results (2013)
    Wiley
    Details
    Publication Date: 2013-03-14
    Description: [1]  This study deals with observations and simulations of the evolution of coastal polynias focusing on the Ronne Polynia. We compare differences in polynia extent and ice drift patterns derived from satellite radar images and from simulations with the Finite Element Sea ice Ocean Model (FESOM), employing three atmospheric forcing data sets that differ in spatial and temporal resolution. Two polynia events are analysed, one from austral summer and one from late fall 2008. The open water area in the polynia is of similar size in the satellite images and in the model simulations, but its temporal evolution differs depending on katabatic winds being resolved in the atmospheric forcing data sets. Modelled ice drift is slower than the observed and reveals greater turning angles relative to the wind direction in many cases. For the summer event, model results obtained with high-resolution forcing are closer to the drift field derived from radar imagery than those from coarse-resolution forcing. For the late-fall event, none of the forcing data yields outstanding results. Our study demonstrates that a dense (1-3 km) model grid and atmospheric forcing provided at high spatial resolution (〈50 km) are critical to correctly simulate coastal polynias with a coupled sea-ice ocean model.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
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    Katabatic winds and polynya dynamics at Coats Land, Antarctica (2013)
    Cambridge University Press
    Details
    Publication Date: 2013-11-26
    Description: Mesoscale model simulations were conducted for the Weddell Sea region for the autumn and winter periods of 2008 using a high-resolution, limited-area, non-hydrostatic atmospheric model. A sea ice–ocean model was run with enhanced horizontal resolution and high-resolution forcing data of the atmospheric model. Daily passive thermal and microwave satellite data was used to derive the polynya area in the Weddell Sea region. The focus of the study is on the formation of polynyas in the coastal region of Coats Land, which is strongly affected by katabatic flows. The polynya areas deduced from two independent remote sensing methods and data sources show good agreement, while the results of the sea ice simulation show some weaknesses. Linkages between the pressure gradient force composed of a katabatic and a synoptic component, offshore wind regimes and polynya area are identified. It is shown that the downslope surface offshore wind component of Coats Land is the main forcing factor for polynya dynamics, which is mainly steered by the offshore pressure gradient force, where the katabatic force is the dominant term. We find that the synoptic pressure gradient is opposed to the katabatic force during major katabatic wind events.
    Print ISSN: 0954-1020
    Electronic ISSN: 1365-2079
    Topics: Biology , Geography , Geosciences
    Published by Cambridge University Press
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  • 4
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    Sea ice motion and open water area at the Ronne Polynia, Antarctica: Synthetic aperture radar observations versus model results (2013)
    American Geophysical Union
    Details
    Publication Date: 2013-04-01
    Print ISSN: 2169-9275
    Electronic ISSN: 2169-9291
    Topics: Geosciences , Physics
    Published by American Geophysical Union
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  • 5
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    Simulated heat flux and sea ice production at coastal polynyas in the southwestern Weddell Sea (2013)
    American Geophysical Union
    Details
    Publication Date: 2013-05-01
    Print ISSN: 2169-9275
    Electronic ISSN: 2169-9291
    Topics: Geosciences , Physics
    Published by American Geophysical Union
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  • 6
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    Simulated heat flux and sea ice production at coastal polynyas in the southwestern Weddell Sea (2013)
    American Geophysical Union
    In:  EPIC3JOURNAL OF GEOPHYSICAL RESEARCH: OCEANS, American Geophysical Union, 118, pp. 2640-2652
    Details
    Publication Date: 2019-07-17
    Description: Coastal polynyas are areas in an ice-covered ocean where the ice cover is exported, mostly by off-shore winds. The resulting reduction of sea ice enables an enhanced ocean-atmosphere heat transfer. Once the water temperatures are at the freezing point, further heat loss induces sea ice production. The heat exchange and ice production in coastal polynyas in the southwestern Weddell Sea is addressed using the Finite-Element Sea-ice Ocean Model, a primitive-equation, hydrostatic ocean circulation model coupled with a dynamic-thermodynamic sea-ice model, which allows to quantify the amount of heat associated with cooling of the water column. Three important polynya regions are identified: at Brunt Ice Shelf, at Ronne Ice Shelf and along the southern part of the Antarctic Peninsula. Multiyear winter means (May–September 1990–2009) give an upward heat flux to the atmosphere of 311 W/m^2 in the Brunt polynyas, 511 W/m^2 in Ronne Polynya and 364 W/m^2 in the Antarctic Peninsula polynyas, whereof 57 W/m^2, 49 W/m^2 and 48 W/m^2, respectively, are supplied as oceanic heat flux from deeper layers. The mean winter sea ice production is 7.2 cm/d in the Brunt polynyas corresponding to an ice volume of 1.3x10^10 m^3/winter, 13.2 cm/d at Ronne polynya (4.4x10^10 m^3/winter), and 9.2 cm/d in the Antarctic Peninsula polynyas (2.1x10^10 m^3/winter). The heat flux to the atmosphere inside polynyas is 7 to 9 times higher than the heat flux in the adjacent area; polynya ice production per unit area exceeds adjacent values by a factor of 9 to 14.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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