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Ice Chart Colour Standard Proposal-II. Approved by the JCOMM Sea Ice Expert Team October 21-25, 2002 John Falkingham on behalf of the IICWG Colour Code Working Sub-Group. Ice Chart Colour Standard. IICWG-2 (Oct 2000) started with initial ideas and principles

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ice chart colour standard proposal ii

Ice Chart Colour Standard Proposal-II

Approved by the JCOMM Sea Ice Expert Team

October 21-25, 2002

John Falkingham on behalf of the

IICWG Colour Code Working Sub-Group

ice chart colour standard
Ice Chart Colour Standard
  • IICWG-2 (Oct 2000) started with initial ideas and principles
  • IICWG-3 (Nov 2001) drafted the basis for this agreement
  • refinements based on comments from Ice Services who tested the original proposal during the first half of 2002
ice chart colour standard1
Ice Chart Colour Standard
  • Two separate colour codes for use on ice charts
    • one based on total concentration intended for use when the stage of development is relatively uniform but concentration is highly variable
      • arctic summer navigation
    • one based on stage of development intended for use when the concentration is relatively uniform (high) but the stage of development is variable
      • arctic winter navigation
concentration colour standard

Ice Free

or

000-100-255

<1 tenth ice

150-200-255

1-3 tenths ice

140-255-160

4-6 tenths ice

255-255-000

7-8 tenths ice

255-125-007

9-10 tenths ice

255-000-000

Fast Ice

Shelf Ice

150-150-150

210-210-210

Undefined Ice

Optional

?

000-000-000

?

7-10 tenths New Ice

255-175-255

9+-10 tenths Nilas, Grey Ice (mainly on leads)

255-100-255

Concentration Colour Standard

Colour is based on Total Ice Concentration

Areas of No Information are annotated accordingly

stage of development colour standard

Ice Free (amend: Free of Sea Ice)

150-200-255 *

or

New Ice

000-000-255

Dark Nilas

255-175-255 *

Light nilas

255-100-255 *

Young ice

220-080-235

Grey ice

135-060-215

Grey-white ice

170-040-240

FY thin ice

155-210-000

FY thin ice (30 -50 cm)

215-250-130

FY thin ice (50-70 cm)

175-250-000

FY medium ice

000-200-020

FY thick ice

000-120-000

Old ice

180-100-050 *

Second-year ice

255-120-010

Multi-year ice

200-000-000

Fast ice

150-150-150

Shelf ice

210-210-210

Undefined Ice

000-000-000

Stage of Development Colour Standard

Colour is based on Stage of Development of Predominant Ice

? ? ? ?

Areas of No Information are annotated accordingly

ice chart colour code notes
Ice Chart Colour Code - Notes
  • The two separate colour codes are mutually exclusive - only one or the other should be used on a single chart
  • A legend depicting the colour code used should be included on every chart
  • The optional colour indicating 9+-10 tenths of nilas or grey ice should only be used to indicate level ice, mainly on leads; it should not be used for ice broken into brash or ice cakes or for concentrations less than 9+ tenths
  • Undefined ice is used when it is known that ice is in an area but its characteristics are not known - this is different from No Information which indicates that nothing at all is known about the area
  • No specific colour is assigned to areas of “No Information”; such areas should be clearly indicated on ice charts - text annotation may be used where appropriate; an assigned colour within the code should not be used to indicate “No Information”
  • Colour codes do not preclude use of black and white hatching patterns or egg codes; egg codes may be used along with with colours
  • Other symbols may be used in addition to the standard colours to depict special ice conditions under national practice