The parameters (2 - 5) connected with ice concentration were calculated from
data on total ice concentration and partial concentration of ice of different
age gradations. The initial data sets were obtained by taking the values of total
and partial ice concentration from the digital review (generalized for 7-10
days) ice charts (at the points corresponding to the end of each sub-segment).
The charts referring to the 1953-1979 period were constructed from data of
airborne and satellite ice observations. The charts of the 1990 to 1994 period were
plotted from satellite observation data. In all cases data of polar stations,
ships and icebreakers were taken into account.
The spatial resolution of initial data is not worse than 4 km. The error in
determining the boundaries of uniform ice zones is 2 to 10 km under the normal
weather conditions and up to 50 km under the unfavorable conditions. Based on
airborne observations, the concentration is determined with an accuracy up to 1/10
and the age category with an accuracy up to 1 age category. If based on
satellite observations the accuracy is up to 2/10 and up to 2-3 age categories,
respectively.
The accuracy of presenting the ice characteristics in the digital storage
formats equals 25 km for the geographical location and 0.5/10 and 1 age category
for concentration.
The values of parameters for each sub-segment observed during each month of
each year were derived as follows:
- parameter 2 as means of the sum of partial concentrations of new ice, nilas,
young and first-year ice;
- parameter 3 as means of the sum of partial concentrations of old,
second-year and multiyear ice;
- parameter 4 as a minimum value of total ice concentration;
- parameter 5 as a maximum value of total ice concentration.
Path: <NSR_DATA>\icesnow\workpackage2
Table type: DText table.
* Partial young ice concentration for route S by year and month
375 records, 144 descriptive fields.
Fields: [<Name>] -- <Alias> (type of field)
[Year] -- "Year" (Numeric, no decimals)
[Month] -- "Month" (Numeric, no decimals)
[1] -- "1" (Numeric, no decimals)
...
[142] -- "142" (Numeric, no decimals)
Path: <NSR_DATA>\icesnow\workpackage2
Table type: DText table.
* Partial young ice concentration for route N by year and month
371 records, 132 descriptive fields.
Fields: [<Name>] -- <Alias> (type of field)
[Year] -- "Year" (Numeric, no decimals)
[Month] -- "Month" (Numeric, no decimals)
[201] -- "201" (Numeric, no decimals)
....
[330] -- "330" (Numeric, no decimals)
Path: <NSR_DATA>\icesnow\workpackage2
Table type: DText table.
* Partial old ice concentration for route S by year and month
375 records, 144 descriptive fields.
Fields: [<Name>] -- <Alias> (type of field)
[Year] -- "Year" (Numeric, no decimals)
[Month] -- "Month" (Numeric, no decimals)
[1] -- "1" (Numeric, no decimals)
...
[142] -- "142" (Numeric, no decimals)
Path: <NSR_DATA>\icesnow\workpackage2
Table type: DText table.
* Partial old ice concentration for route N by year and month
371 records, 132 descriptive fields.
Fields: [<Name>] -- <Alias> (type of field)
[Year] -- "Year" (Numeric, no decimals)
[Month] -- "Month" (Numeric, no decimals)
[201] -- "201" (Numeric, no decimals)
....
[330] -- "330" (Numeric, no decimals)
Path: <NSR_DATA>\icesnow\workpackage2
Table type: DText table.
* Minimum total ice concentration for route S by year and month
375 records, 144 descriptive fields.
Fields: [<Name>] -- <Alias> (type of field)
[Year] -- "Year" (Numeric, no decimals)
[Month] -- "Month" (Numeric, no decimals)
[1] -- "1" (Numeric, no decimals)
...
[142] -- "142" (Numeric, no decimals)
Path: <NSR_DATA>\icesnow\workpackage2
Table type: DText table.
* Minimum total ice concentration for route N by year and month
371 records, 132 descriptive fields.
Fields: [<Name>] -- <Alias> (type of field)
[Year] -- "Year" (Numeric, no decimals)
[Month] -- "Month" (Numeric, no decimals)
[201] -- "201" (Numeric, no decimals)
....
[330] -- "330" (Numeric, no decimals)
Path: <NSR_DATA>\icesnow\workpackage2
Table type: DText table.
* Maximum total ice concentration for route S by year and month
375 records, 144 descriptive fields.
Fields: [<Name>] -- <Alias> (type of field)
[Year] -- "Year" (Numeric, no decimals)
[Month] -- "Month" (Numeric, no decimals)
[1] -- "1" (Numeric, no decimals)
...
[142] -- "142" (Numeric, no decimals)
Path: <NSR_DATA>\icesnow\workpackage2
Table type: DText table.
* Maximum total ice concentration for route N by year and month
371 records, 132 descriptive fields.
Fields: [<Name>] -- <Alias> (type of field)
[Year] -- "Year" (Numeric, no decimals)
[Month] -- "Month" (Numeric, no decimals)
[201] -- "201" (Numeric, no decimals)
....
[330] -- "330" (Numeric, no decimals)
Ice concentration