From State of the Climate in 2021 - World Meteorlogical Organization, October 2021.
1970-2012
Canadian Glaciers Face Big Losses 0313.rtf
Athabaska Glacier retreat over 86 years
Ice Melt, Sea Level Rise and Superstorms - Hansen 0316.pdf - 20 pp, abridgement of the peer-reviewed publication
Cold icemelt from Antarctica spreads out along the ocean surface. That inhibits the vertical mixing (warmer water to the top) there that has driven the great ocean circulation. In Antarctica, the warmer water below the ice eats away at glaciers from underneath. Cold icemelt from Greenland leads to shutdown of the Atlantic overturning circulation.
Ice losses from Greenland and Antartica grow, modelled as exponentially, with doubling times of 10, 20, or 40 years. Sea level rises non-linearly, 5-9 meters over 50 to 150 years. This is simlar to what happened 120,000 years ago, when sea levels rose from 3-4 meters higher than today to about 9 meters higher, including 2-3 meters within several decades. (For perspective, the sea level range (maximum - minimum) over the recent ice ages was about 125 meters.)
Section Map: Ice