Chinese Journal of Polar Research

ADVANCES IN POLAR SCIENCE ›› 2009, Vol. 20 ›› Issue (1-English): 72-80.

• Contents • Previous Articles    

Preliminary results on relationship between thermal diffusivity and porosity of sea ice in the Antarctic

 Shi Liqiong1, Bai Yila2, Li Zhijun1, Cheng Bin1,3 and Lepparanta Matti4   

  1. 1 State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;
    2 Department of Mathematics, Bohai University, Jinzhou 121000, China;
    3 Finnish Meteorologica Institute, FI-00014 Helsinki, Finland;
    4 Department of Physics, University of Helsinki, P. O. Box 64, FI-00014 Helsinki, Finlan
  • Online:1959-03-30 Published:1959-03-30
  • Contact: Shi Liqiong

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Abstract:

The in situ sea - ice temperature, salinity and density observed from Chinese Antarctic Zhongshan Station have been applied to calculate the vertical profile of sea ice porosity. Based on numericalmethod, a number of schemes on sea - ice thermal diffusivity versus porosity have been accessed and one optimized scheme is identified by an op timal controlmodelwith an advanced distributing parameter system. For simplicity, the internal heating source item was neglected in the heat conduction equation during the identification p rocedure. In order to illustrate the applicability of this identified scheme, the vertical ice temperature p rofiles have been simulated and compared withmeasurements, respectively by using identified scheme and by classical thermodynamic formulae. The comparisons indicated that the scheme describing sea - ice thermal diffusivity and porosity is reasonable. In sp ite of a minor imp rovement of accuracy of results against in situ data, the identified scheme has a more physical meaning and could be used potentially in various applications.

Key words: sea ice, porosity, optimal identification, numerical simulations, Antarctica