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  • 1
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    Validating satellite derived and modelled sea-ice drift in the Laptev Sea with in situ measurements from the winter of 2007/2008 (2011)
    Norwegian Polar Institute
    In:  Polar Research, 30 . p. 7218.
    Details
    Publication Date: 2015-04-27
    Description: A correct representation of the ice movement in an Arctic sea-ice-ocean coupled model is essential for a realistic sea-ice and ocean simulation. The aim of this study is to validate the observational and simulated sea-ice drift for the Laptev Sea Shelf region with in situ measurements from the winter of 2007/08. Several satellite remote-sensing data sets are first compared to mooring measurements and afterwards to the sea-ice drift simulated by the coupled sea-ice-ocean model. The different satellite products have a correlation to the in situ data ranging from 0.56 to 0.86. The correlations of sea-ice direction or individual drift vector components between the in situ data and the observations are high, about 0.8. Similar correlations are achieved by the model simulations. The sea-ice drift speed derived from the model and from some satellite products have only moderate correlations of about 0.6 to the in situ record. The standard errors for the satellite products and model simulations drift components are similar to the errors of the satellite products in the central Arctic and are about 0.03 m/s. The fast-ice parameterization implementation in the model was also successfully tested for its influence on the sea-ice drift. In contrast to the satellite products, the model drift simulations have a full temporal and spatial coverage and results are reliable enough to use as sea-ice drift estimates on the Laptev Sea Shelf.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3402/polar.v30i0.7218
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Unknown
    Evaluation of simulated sea-ice concentrations from sea-ice/ocean models using satellite data and polynya classification methods (2011)
    Norwegian Polar Institute
    In:  Polar Research, 30 (7124).
    Details
    Publication Date: 2016-01-07
    Description: Sea-ice concentrations in the Laptev Sea simulated by the coupled North Atlantic—Arctic Ocean—Sea-Ice Model and Finite Element Sea-Ice Ocean Model are evaluated using sea-ice concentrations from Advanced Microwave Scanning Radiometer—Earth Observing System satellite data and a polynya classification method for winter 2007/08. While developed to simulate largescale sea-ice conditions, both models are analysed here in terms of polynya simulation. The main modification of both models in this study is the implementation of a landfast-ice mask. Simulated sea-ice fields from different model runs are compared with emphasis placed on the impact of this prescribed landfast-ice mask. We demonstrate that sea-ice models are not able to simulate flaw polynyas realistically when used without fast-ice description. Our investigations indicate that without landfast ice and with coarse horizontal resolution the models overestimate the fraction of open water in the polynya. This is not because a realistic polynya appears but due to a larger-scale reduction of ice concentrations and smoothed ice-concentration fields. After implementation of a landfast-ice mask, the polynya location is realistically simulated but the total open-water area is still overestimated in most cases. The study shows that the fast-ice parameterization is essential for model improvements. However, further improvements are necessary in order to progress from the simulation of large-scale features in the Arctic towards a more detailed simulation of smaller-scaled features (here polynyas) in an Arctic shelf sea.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3402/polar.v30i0.7124
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Unknown
    Evaluation of simulated sea-ice concentrations from sea-ice(ocean models using satellite data and polynya classification methods (2010)
    In:  [Poster] In: Joint Russian-German Workshop on Research in the Laptev Sea Region, 08.11.-11.11.2010, St. Petersburg, Russia .
    Details
    Publication Date: 2014-12-09
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Poster
  • 4
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    Verification of simulated sea-ice concentrations from sea-ice/ocean models using satellite data (2010)
    In:  [Poster] In: EGU General Assembly 2010, 02.05.-07.05.2010, Vienna, Austria .
    Details
    Publication Date: 2014-12-11
    Description: Sea-ice concentrations in the Laptev Sea simulated by the coupled North Atlantic – Arctic Ocean – Sea-Ice Model (NAOSIM) and Finite Element Sea-Ice Ocean Model (FESOM)are verified using sea-ice concentrations from AMSR-E satellite data and a polynya classification method for winter 2007/08. Simulated sea-ice fields from different model runs are compared with emphasis on the impact of an integrated fast-ice mask. Sea-ice models are not able to simulate polynyas realistically when used in their operational versions. Without fast ice, our investigations indicate that the simulation of large leads and smoothed sea-ice concentration fields compensates the absence of the polynyas. After implementation of a fast-ice mask the polynya location is realistically simulated, but the total open water area is largely overestimated. The study shows that further model improvements are necessary in order to achieve the important step from the simulation of large-scale features in the Arctic towards a more detailed simulation of smaller-scaled features (here polynyas) in an Arctic shelf sea.
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Poster
  • 5
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    The Role of the Laptev Sea Fast Ice in an Arctic Ocean - Sea Ice Coupled Model (2009)
    In:  (Master thesis), Saint Petersburg State University ; Bremen University, Saint-Petersburg, Russia ; Bremen, 57 pp
    Details
    Publication Date: 2015-04-02
    Description: Landfast sea ice edge plays a dominant role in positioning of flaw polynyas - winter sea ice production and dense water formation areas of the Arctic shelf seas. Laptev Sea fast ice is of particular interest due to its role of slowing down the freshwater discharge of Lena and other major Siberian rivers, impacting the thermohaline circulation and sea-ice regimes over the shelf and in the Arctic Basin. Laptev Sea fast ice masks for winter 2007/08 based on satellite observations were used to incorporate land fast ice into the coupled ice-ocean model NAOSIM (North Atlantic/Arctic Ocean Sea Ice Model). Model run results with and without a parameterization for fast ice were compared to mooring data and remote sensing data. A significantly more realistic representation of sea ice properties as well as oceanic parameters was obtained by including the fast ice in the model.
    Type: Thesis , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Thesis - not published by a publisher
  • 6
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    Evaluation of simulated sea-ice concentrations from sea ice / ocean models using satellite data and polynya classification methods (2011)
    In:  EPIC3Polar Research, 30, 7124
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 7
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    The use of SAR products for expedition planning and polynya model validation (2009)
    In:  EPIC3MOCA-09, July 2009, Montreal, Canada.
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 8
    facet.materialart.
    Unknown
    Evaluation of simulated sea-ice concentrations from sea-ice/ ocean models using satellite data and polynya classification methods (2011)
    In:  EPIC3Polar Research, 30(7124), ISSN: 1751-8369
    Details
    Publication Date: 2019-07-17
    Description: Sea-ice concentrations in the Laptev Sea simulated by the coupled North Atlantic—Arctic Ocean—Sea-Ice Model and Finite Element Sea-Ice Ocean Model are evaluated using sea-ice concentrations from Advanced Microwave Scanning Radiometer—Earth Observing System satellite data and a polynya classification method for winter 2007/08. While developed to simulate largescale sea-ice conditions, both models are analysed here in terms of polynya simulation. The main modification of both models in this study is the implementation of a landfast-ice mask. Simulated sea-ice fields from different model runs are compared with emphasis placed on the impact of this prescribed landfast-ice mask. We demonstrate that sea-ice models are not able to simulate flaw polynyas realistically when used without fast-ice description. Our investigations indicate that without landfast ice and with coarse horizontal resolution the models overestimate the fraction of open water in the polynya. This is not because a realistic polynya appears but due to a larger-scale reduction of ice concentrations and smoothed ice-concentration fields. After implementation of a landfast-ice mask, the polynya location is realistically simulated but the total open-water area is still overestimated in most cases. The study shows that the fast-ice parameterization is essential for model improvements. However, further improvements are necessary in order to progress from the simulation of large-scale features in the Arctic towards a more detailed simulation of smaller-scaled features (here polynyas) in an Arctic shelf sea.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 9
    facet.materialart.
    Unknown
    Validating satellite derived and modelled sea-ice drift in the Laptev Sea with in situ measurements from the winter of 2007/2008 (2011)
    In:  EPIC3Polar Research, 30(0), ISSN: 0800-0395
    Details
    Publication Date: 2019-07-17
    Description: A correct representation of the ice movement in an Arctic sea-ice-ocean coupled model is essential for a realistic sea-ice and ocean simulation. The aim of this study is to validate the observational and simulated sea-ice drift for the Laptev Sea Shelf region with in situ measurements from the winter of 2007/08. Several satellite remote-sensing data sets are first compared to mooring measurements and afterwards to the sea-ice drift simulated by the coupled sea-ice-ocean model. The different satellite products have a correlation to the in situ data ranging from 0.56 to 0.86. The correlations of sea-ice direction or individual drift vector components between the in situ data and the observations are high, about 0.8. Similar correlations are achieved by the model simulations. The sea-ice drift speed derived from the model and from some satellite products have only moderate correlations of about 0.6 to the in situ record. The standard errors for the satellite products and model simulations drift components are similar to the errors of the satellite products in the central Arctic and are about 0.03 m/s. The fast-ice parameterization implementation in the model was also successfully tested for its influence on the sea-ice drift. In contrast to the satellite products, the model drift simulations have a full temporal and spatial coverage and results are reliable enough to use as sea-ice drift estimates on the Laptev Sea Shelf.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
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