NOAA’s 2021 Arctic Report Card, released today at the American Geophysical Union’s Fall Meeting, documents the numerous ways that climate change continues to fundamentally alter this once reliably-frozen region, as increasing heat and the loss of ice drive its transformation into a warmer, less frozen, and more uncertain future.
The Arctic continues to warm more than twice as fast as the rest of the globe. The October-December 2020 period was the warmest Arctic autumn on record dating back to 1900. The average surface air temperature over the Arctic this past year (October 2020-September 2021) was the 7th warmest on record.
The total extent of sea ice in September 2021 was the 12th lowest on record. All 15 of the lowest minimum extents have occurred in the last 15 years. The substantial decline in Arctic ice extent since 1979 is one of the most iconic indicators of climate change.
Some of the fastest rates of ocean acidification around the world have been observed in the Arctic Ocean. Two recent studies indicate a high occurrence of severe dissolution of shells in natural populations of sea snails, an important forage species, in the Bering Sea and Amundsen Gulf.
The Arctic Report Card is an original, peer-reviewed environmental observations and analysis that documents rapid and dramatic shifts in weather, climate, terrestrial and oceanic conditions in the circumpolar region. This year’s report was compiled by 111 scientists from 12 nations. PMEL and UW Cooperative Institute scientists contributed to sections on surface air temperature (Dr. James Overland, Dr. Muyin Wang), sea ice (Dr. Kevin Wood) and on ocean acidification (Dr. Jessica Cross, Dr. Darren Pilcher).