Determination of the environmenta1 data for excluded from the NSR
Four different routes are considered in this simulation study as described in 2.1. However, as Figure 2.2.1 shows, segments between Hamburg and North Cape in the Barents Sea, and from the Bering Sea to Yokohama are excluded from the NSR. The environmental data along these routes were not supplied by WP1, thus they are estimated in accordance with the following assumptions.
(1)Ice exists only in a couple of segments neighboring the edge of NSR.
(2)The ice condition in a couple of segments lying next to the edge of the NSR is intermediate ice condition between ice free sea area and the edge of the NSR.
The rest of concrete determinations are detailed in Appendix A. The accuracy of these data was checked using the data produced by other INSROP study (Proshutinsky et al., 1998). Their data sources are mainly based on the US National Sea Ice Data Center. Assumed values of parameters were almost the same as their data on the average basis.
