"Arctic sea ice reaches its annual maximum extent in March. But while ice extent is high this year, scientists are far more concerned by the drastic loss of sea ice volume, which continues its steady decline.

A new study has documented drastic ice loss in both the north and south polar regions; scientists found that the single biggest reduction came from Arctic sea ice — the Earth lost 7.6 trillion metric tons of it in the last three decades.

Another new study shows that the last bastion of old, thick multiyear ice in the Arctic, north of Greenland and Ellesmere Island, is diminishing as the stability of the Nares ice arches declines — blockages which work like a cork in a bottle to stop multiyear ice from flowing out into the Atlantic."

Gloria Dickie reports for Mongabay March 16, 2021. [2]