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Sea ice modelling, forecasting, and validation activities at Alfred Wegener Institute (AWI), Bremerhaven, Germany

Sea ice modelling, forecasting, and validation activities at Alfred Wegener Institute (AWI), Bremerhaven, Germany Christian Haas Modelling Thickness profiling SAR remote sensing Operating stand-alone & coupled ice-ocean dynamic/thermodynamic models after Hibler & Lemke, Semtner

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Sea ice modelling, forecasting, and validation activities at Alfred Wegener Institute (AWI), Bremerhaven, Germany

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  1. Sea ice modelling, forecasting, and validation activities at Alfred Wegener Institute (AWI), Bremerhaven, Germany Christian Haas • Modelling • Thickness profiling • SAR remote sensing

  2. Operating stand-alone & coupled ice-ocean dynamic/thermodynamic models after Hibler & Lemke, Semtner • Viscous-plastic & elastic viscous plastic rheologies • Arctic and Antarctic • Modified and improved by Fischer, Harder, Kreyscher, Hillmer, Lieser • Focus on climate system studies • New: Finite element (FE) modelling

  3. [1/km] [1/km] Ridge frequency

  4. Variability of Arctic sea-ice volume 1951-1999

  5. 1951-1999 Spatial thickness and drift trends 1951-1999

  6. 1997 Temperature Anomaly (450 m depth) Temperature anomalies in the Arctic Ocean AWI-NAOSIM Temperature flux through Fram Strait

  7. Motivation Accurate Mesh Refinement and Adaptive Meshes Variational Formulation for Complex Rheologies FE Model

  8. SSM/I observations Sea ice model data 8.3.98 8.3.98 Assimilation (OI) Model run (7 days) SSM/I observationsSea ice model data 15.3.98 15.3.98 Assimilation (OI) Model run (5 days) SSM/I observations Sea ice model data 20.3.98 20.3.98 Comparison Assimilation Scheme

  9. SSM/I (observed) Model (stand-alone) Model (assimilation) Result of Assimilation

  10. EM thickness profiles

  11. SIMS: Sea Ice Monitoring System

  12. EM Bird Helicopter-borne EM profiling

  13. Typical EM bird thickness profile and distribution

  14. Ice thickness variability in the Transpolar Drift: 1991, 1996, 1998 & 2001

  15. Ice Ridging Information for Decision Making in Shipping

  16. SITHOS Sea Ice Thickness Observation System

  17. SITHOS Sea Ice Thickness Observation System Integration of SAR imagery for algorithm development and extrapolation to larger ice regimes Polarstern

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