Still more striking, and significant, has been a severe decline in the average thickness of the ice pack, and thus of its volume (graph). (history.aip.org)
On time scales of years to centuries, the largest changes in tides around the ice sheets are likely to be caused by changes in the extent and thickness of ice shelves. (eos.org)
• From 1976 to 1999 the average thickness of ice in the Arctic Ocean had dropped 43 percent. (scientificamerican.com)