Figure C-4 Variations in ice thickness by sea region and month

　

Ice Index

Ice index is a quantitative parameter that represents the extent of difficulty in ice navigation. This practical concept was originally introduced in the CASPPR in Canada. The present ice index differs from the Canadian ice index in terms not only of ice type, ice thickness and ice concentration, but also in terms of the influence of ice strength, ridge size and ridge distribution.

The ice index I was defined as a sum of three kinds of ice index, as follows:

I = I_A + I_B + I_C

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