International Ice Charting Working Group

1. Daily analysis ice charts at scale of 1:2M are produced for southern regions in the winter and northern regions in the summer to support shipping activities, for each satellite image.
2. Image analysis ice charts are produced for the same regions and time of year as daily ice charts.
3. Weekly regional ice charts at scale of 1:4M are produced covering all Canadian ice-encumbered waters.

1. 1. Twice per month ice analysis charts of the Arctic and Antarctic. The Arctic analysis is done on the weeks during which the 1st and the 15th of the month fall. If there are two weeks between the 1st and 15th, then the Arctic analysis will be completed three times during that month. Each analysis is produced as both a black and white and color version. The black and white version depicts ice conditions using the WMO egg code. The color version is based on total concentration and also depicts WMO code eggs. The JPEG charts can encompass a whole sea (e.g.. Beaufort Sea) or part of a sea (e.g. North Greenland). The .e00 coverage is based on nominal geographic boundaries of seas. The coverages that correspond to the individual JPEG charts (e.g. Bering West, Bering East and Kamchatka) are joined together into a complete sea (e.g. Bering Sea). An ASCII text metadata file describing the imagery used in the analyses is included for the East Arctic and the West Arctic.
2. 2. Each week (beginning Summer 2001) a Northern Hemisphere .e00 Analysis or Southern Hemisphere .e00 analysis will be placed on the WWW site.
3. 3. The Alaskan regional analysis (Beaufort, Chukchi and Bering Seas, Cook Inlet and the High Arctic West 1 and 2 areas) is completed at least once a week all year. The Bering, Chukchi and Beaufort Seas and the Cook Inlet are analyzed twice per week, on Tuesdays and Fridays when there is an ice edge present. The Tuesday chart which falls on the 1st and 15th of the month will be part of the hemispheric coverage for that week.
4. 4. Once per week ice analysis of the Great Lakes. This is produced on Thursdays. The NIC hosts the Great Lakes .gif chart and the .e00 coverage produced by the Canadian Ice Service on Mondays.
5. 5. Ice analyses of the Chesapeake Bay and Delaware Bay region are produced at least weekly when there is ice present.
6. 6. Ice analyses of the Ross Sea are produced at least every other week but are done weekly during the austral summer navigation season.

1. 1. 30 Day Forecasts for the Arctic. Issued Monthly on or about the 1st of the month and valid the 1st of the following month.
2. 2. 30 Day Forecasts for the North American Arctic area is issued for the period July through December unless the ice cover does not require the forecasts. These forecasts are comprised of jpeg format graphics and a text section. They are produced as North American Ice Service products jointly by the NIC and the CIS.
3. 3. 30 Day Forecasts for the Great Lakes are issued near the 1st of December through March.
4. 4. A Long Range Outlook for the Great Lakes is issued near the 1st of December.

1. 1. Seasonal Outlooks for the East and West Arctic. Issued during the last week in May as a North American Ice Service product. Produced jointly by the CIS and the NIC.
2. 2. Seasonal Outlook for the Ross Sea and McMurdo Sound. Issued in late October in support of the re-supply of McMurdo station.

Other statistical products have been produced for some regions and are not available on our Web site yet; they include:

1. 30 year median of predominant ice type (1971-2000)
2. 30 year frequency of presence of sea ice (1971-2000)
3. 30 year frequency of presence of old ice (1971-2000)
4. same types as above but for 10 year periods
5. dates of freeze-up and break-up
6. prototype anomaly charts showing departures from normal conditions for concentration and ice type; also used for interdecadal comparisons

1. weekly extents and coverages (weekly coverage can be used as chart severity index)
2. total accumulated coverages for a season (used to compare severity of ice seasons from 1968 to 2000); a variant is total accumulated old ice
3. length of seasons for all years (start of season defined as when ice reaches a threshold value)
4. minimum and maximum ice coverages

• Delivery of Icemap GRID data period 1998-1999 to AARI for conversion into SIGRID format (Oct 2000).
• Delivery of Icemap GRID data remaining period 1980-1997 (autumn 2002).