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Ice Chart Colour Standard Proposal

Ice Chart Colour Standard Proposal. 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

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  1. Ice Chart Colour Standard Proposal 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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