ZHAO Jinping, LI Tao, EHN Jens, BARBER David. An analytical validation for the attenuation of lateral propagating light in sea ice[J]. Acta Oceanologica Sinica, 2015, 34(3): 1-8. doi: 10.1007/s13131-015-0628-5
Citation: ZHAO Jinping, LI Tao, EHN Jens, BARBER David. An analytical validation for the attenuation of lateral propagating light in sea ice[J]. Acta Oceanologica Sinica, 2015, 34(3): 1-8. doi: 10.1007/s13131-015-0628-5

An analytical validation for the attenuation of lateral propagating light in sea ice

doi: 10.1007/s13131-015-0628-5
  • Received Date: 2014-05-20
  • Rev Recd Date: 2014-10-10
  • The attenuation of lateral propagating light (LPL) in sea ice was measured using an artificial light source in the Canadian Arctic during the 2007/2008 winter. The apparent attenuation coefficient μ(λ) for lateral propagating light was obtained from the measured logarithmic relative variation rate. In this study an analytical solution based on the strict optical theories is developed to validate the measured result. There is a good consistency between theoretical solution and measured data, by which a quite simple but very rigorous relationship among the light source, measurement geometry, and measured irradiance is established. The attenuation coefficients acquired by measurement and theory are the diffusion attenuation as an apparent optical property of ice, independent of the light source and shining condition. The attenuation ability of sea ice should be caused by the microstructure of sea ice, such as crystal size, ice density, brine volume, air inclusion, etc. It also includes the leak from both interfaces by directional scattering. It is verified that the measuring approach is operational and accurate to measure the attenuation of the LPL. The solution from this study did not tell the connection among the extinction and the inclusions of sea ice theoretically because of insufficient understanding.
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