2017 Arctic Report Card: Arctic sea ice keeps getting younger and thinner | NOAA Climate.gov
▻https://www.climate.gov/news-features/featured-images/2017-arctic-report-card-arctic-sea-ice-keeps-getting-younger-and
Despite the fact that the area of the Arctic Ocean covered by sea ice during the winter maximum has declined only slightly in recent decades, the ice itself is profoundly different than it used to be. Very old ice—thick, strong, and more melt-resistant—has nearly vanished, and the amount of first-year ice—thin, salty, and unlikely to survive the summer—has skyrocketed.
These satellite-based maps show the age of the ice in the Arctic at the end of winter in March 1985 (left) and March 2017 (right). The first age class on the scale (1, darkest blue) means "first-year ice,” which formed in the most recent winter. The oldest ice (>7, white) is ice that is more than nine winters old. Dark gray areas indicate open water or coastal regions where the spatial resolution of the data is coarser than the land map.
▻https://www.climate.gov/sites/default/files/styles/featured-image/public/SeaIceAge_1985_2017.png?itok=4ZPB9jD7
#arctique #glace #hiver #cartographie #climat