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Ice Chart Colour Standard Proposal-II

This proposal outlines two separate colour codes for ice charts, detailing specific colours and values based on total ice concentration and stage of development. The agreement was developed with input from Ice Services, aiming to enhance navigation safety in arctic regions.

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Ice Chart Colour Standard Proposal-II

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

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