Study on ice thickness estimation on Lake Saroma to develop a method to be applied sea ice in the Sea of Okhotsk using SAR data.

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  • 合成開口レーダによるサロマ湖の氷厚分布推定への適用研究
  • ゴウセイ カイコウ レーダ ニ ヨル サロマコ ノ ヒョウコウ ブンプ スイテイ エ ノ テキヨウ ケンキュウ

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In order to evaluate the possibility of measurement of sea ice thickness in the Sea of Okhotsk, a “Sea ice observation and experiment in the Sea of Okhotsk” campaign has been carried out on Lake Saroma, Hokkaido since 1993. Lake Saroma consists of sea water of almost the same salinity as connected to the Sea of Okhotsk, and is covered with sea ice in the winter. The salinity, surface roughness and layer structure of ice are similar to those of thin first-year sea ice produced in the Sea of Okhotsk. The relationship between ice thickness and backscattering coefficients obtained by SAR data shows a negative correlation.<BR>In general, the backscattering from a saline ice such as first-year ice is dominated by surface scattering. If the roughness of the ice surface is uniform, backscatter eventually depends on the dielectric constant of the ice. When the air temperature is lower than the sea ice freezing point of-1.8 degrees centigrade, ice surface temperature is decreasing as the ice thickness is thickening, and then the surface temperature is lowering, it is caused by brine volume decrease within the ice. It is, therefore, considered that the backscattering coefficient is decreased as the dielectric constant decreases because the average dielectric constant as the brine volume decreases. It is possible to retrieve the ice thickness using SAR whenever the snow cover and surface roughness of the ice are uniform.

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