Ct Total Concentration
Total concentration (Ct) 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
Sa Sb Sc So Sd Stages of development
Stages of development (Sa, Sb, Sc) are listed using the following code in
decreasing order of thickness. 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.
So, is used to report a development with the greatest remaining concentration that will not fit into the egg.
If all partical concentrations equal the total concentration and there is a Sd, Sd, is considered to be present in a trace amount. The following codes are used to denote stages of development for sea ice.
Fa Fb Fc, predominant form of ice
Fa Fb Fc Predominant form of
ice (floe size) corresponding to Sa, Sb and Sc
8/10 total concentration
1/10 think first year ice (4.) with cakes form (2.)
4/10 thin first year ice (7) with small floes form (3)
3/10 young gray – white ice (5) with big floes form (5)
Old ice (7.)
The following codes are used to indicate stages of development
Sa, Sb, Sc, Sd and So
of sea ice: