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Ice Chart Symbology
| The World Meteorology Organization (WMO) system for sea ice symbology is more frequently referred to as the "Egg Code" due to the oval shape of the symbol. Click on portions of the egg for additional information. | |||||||||||||||||||||||||
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- Total concentration of ice in area, reported in tenths. Concentration may be expressed as a single number or as a range, not to exceed two tenths (3-5, 5-7 etc.) Ca Cb Cc - Partial concentration (Ca, Cb, Cc) are reported in tenths, but must be reported as a single digit. These are reported in order of decreasing thickness. Ca is the concentration of the thickest ice and Cc is the concentration of the thinnest ice. Sa Sb Sc - Stages of development ( Sa, Sb, Sc) are listed using the following code in decreasing order of thickness. (NOTE: If there is a dot (.), all stage of development codes to the left of the dot (.) are assumed to carry the dot (.)) These codes are directly correlated with the partial concentrations above. Ca is the concentration of stage Sa, Cb is the concentration of stage Sb, and Cc is the concentration of Sc. (Table 1) Fa Fb Fc - Predominant form of ice (floe size) corresponding to Sa, Sb and Sc respectively. (Table 2) So Sd - Development stage (age) of remaining ice types. So if reported is a trace of ice type thicker/older than Sa. Sd is a thinner ice type which is reported when there are four or more ice thickness types. |
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Updated on: August 6, 2008