Arctic Amplification

Assembled from 35 blocks · 1 evidence · 36 related

1. Story
2. The observation that the Arctic has warmed substantially faster than the global mean - work published in 2022 put the factor at close to four times over the period since 1979, higher than the two-to-three times commonly quoted before it. Several mechanisms contribute and their relative weight is still argued: the ice-albedo feedback, in which retreating bright ice exposes dark ocean that absorbs more solar energy; the lapse-rate feedback, in which the Arctic atmosphere warms in a bottom-heavy way that radiates heat to space less efficiently; changes in poleward heat and moisture transport; and cloud effects. The asymmetry is important for this Journey because it does not have an Antarctic twin - the southern hemisphere has an ocean where the north has an ocean basin ringed by land, and a continent where the north has open water, and the two do not respond alike.
3. Knowledge
4. Arctic Ocean
5. Sea Ice
6. Arctic Amplification
7. Connections
8. Sea Ice
9. Arctic Ocean
10. The lowest Arctic sea-ice extent in the satellite record
11. Polynya
12. Arctic Amplification
13. Antarctic Krill (Euphausia superba)
14. Polar Bear (Ursus maritimus)
15. Emperor Penguin (Aptenodytes forsteri)
16. Halley Bay Emperor Penguin Colony
17. The continuous satellite sea-ice record begins
18. A long-term decline in krill density is linked to winter sea ice
19. The Arctic summer minimum drops far below anything previously observed
20. The lowest Arctic sea-ice extent in the satellite record
21. The Halley Bay emperor colony fails and does not recover
22. The emperor penguin is listed as threatened under the US Endangered Species Act
23. Antarctic sea ice reaches a record low, a year after the previous one
24. Antarctica
25. Arctic Amplification
26. Polar Bear (Ursus maritimus)
27. Arctic Tern (Sterna paradisaea)
28. Arctic Council
29. Inuit
30. The continuous satellite sea-ice record begins
31. The Arctic summer minimum drops far below anything previously observed
32. The lowest Arctic sea-ice extent in the satellite record
33. Seven Arctic states pause participation in the Arctic Council
34. Evidence
35. Observational analysis over 1979-2021 finds Arctic warming close to four times the global mean rate, higher than the two-to-three times commonly quoted previously, with the ratio sensitive to how the Arctic region is defined. V55 VERIFICATION BASIS: the paper was not opened during production - no research channel was available. The title, journal and DOI are given from the producer's prior knowledge and must be confirmed before publication; the ratio should not be quoted more precisely than "close to four times" on this basis.