Arctic Sea Ice and Climatology » Arctic Sea Ice Theme Editor: Mr. David Jackson Director Canadian Ice Service, www.ec.gc.ca/glaces-ice/ Marine and Ice Services Division Environment Canada Ottawa, Ontario, Canada 1 Seasonality of Operations and Sea Ice Extent 2 Intergovernmental Panel on Climate Change Fourth Assessment and Beyond 3 Changing Operating Conditions in the Arctic Ocean 4 Arctic Climate Impact Assessment 5 The Nature of Ice at Sea 6 Sea Ice Retreat: More than Meets the Eye