This table is created from the Tbl_5.txt, Tbl_6.txt and Tbl_7.txt files as
prepared by INSROP Project I.4.2 as part of INSROP Phase 2. The table records
refer to ship route segments included in the Tbl_1 shapefile set, which is a part
of the dataset provided by INSROP Project I.4.2. These segments are an extract
of the ship routes as defined in INSROP Working paper no. 108 (1998), prepared
by Work Package 1 (Box B) as part of INSROP Phase 2.
Ice thickness (from age gradations)
The probabilistic characteristics of ice age gradations were calculated for
the period 1953-1994 for 20-mile segments along the navigation routes selected in
WP1 Project. As initial ice thickness data, mean weighted ice thickness in
each segment was used, calculated in the wintertime from age ice gradations and in
the summertime from data on ice melting stages during the process of melting.
The calculation methods were developed in the framework of WP2 Project.
The probabilistic estimates were calculated for 5 ice thickness ranges 0-30,
30-70, 70-120, 120-200, 200-250 (cm) for each month of the year.
Path: <NSR_DATA>\icesnow\i_4_2
Table type: DText table.
* Ice thickness - Frequency of occurrences
3288 records, 9 descriptive fields.
Fields: [<Name>] -- <Alias> (type of field)
[No] -- "No" (Numeric, no decimals)
[Point_id] -- "Point No." (Numeric, no decimals)
[Month] -- "Month" (Numeric, no decimals)
[Num_obs] -- "Number of observations" (Numeric, no decimals)
[Th_0_30] -- "< 30 cm" (Numeric, 1 decimal)
Ice thickness range
[Th_30_70] -- "30 - 70 cm" (Numeric, 1 decimal)
Ice thickness range
[Th_70_120] -- "70 - 120 cm" (Numeric, 1 decimal)
Ice thickness range
[Th_120_200] -- "120 - 200 cm" (Numeric, 1 decimal)
Ice thickness range
[Th_200_250] -- "200 - 250 cm" (Numeric, 1 decimal)
Ice thickness range
Ice thickness - Frequency of occurrences