Antarctic sea ice reaches a record low, a year after the previous one

Assembled from 69 blocks · 1 evidence · 91 related

1. Story
2. Antarctic summer minimum extent falls below the previous record set in February 2022, which had itself been the first below two million square kilometres in the satellite era. The significance is that until about 2016 Antarctic sea ice had shown no decline at all, and in some years a slight increase - the two hemispheres had been behaving differently, and then the southern record turned sharply. Whether that is a regime shift or extreme variability in a short record is genuinely unresolved.
3. Knowledge
4. Antarctica
5. Sea Ice
6. Antarctic sea ice reaches a record low, a year after the previous one
7. Southern Ocean
8. Connections
9. Sea Ice
10. Antarctica
11. Southern Ocean
12. Polynya
13. Arctic Amplification
14. Antarctic Krill (Euphausia superba)
15. Polar Bear (Ursus maritimus)
16. Emperor Penguin (Aptenodytes forsteri)
17. Halley Bay Emperor Penguin Colony
18. The continuous satellite sea-ice record begins
19. A long-term decline in krill density is linked to winter sea ice
20. The Arctic summer minimum drops far below anything previously observed
21. The lowest Arctic sea-ice extent in the satellite record
22. The Halley Bay emperor colony fails and does not recover
23. The emperor penguin is listed as threatened under the US Endangered Species Act
24. Antarctic sea ice reaches a record low, a year after the previous one
25. Arctic Ocean
26. Antarctic Circumpolar Current (ACC)
27. Emperor Penguin (Aptenodytes forsteri)
28. Halley Bay Emperor Penguin Colony
29. The Antarctic Treaty (1959)
30. McMurdo Station
31. Vostok Station
32. Cook crosses the Antarctic Circle
33. Antarctica is sighted - by whom is disputed
34. Amundsen reaches the South Pole
35. Scott reaches the South Pole and finds he is second
36. The International Geophysical Year puts twelve nations on the ice at once
37. The Antarctic Treaty is signed at Washington
38. The continuous satellite sea-ice record begins
39. Vostok records minus 89.2 degrees Celsius
40. Antarctic sea ice reaches a record low, a year after the previous one
41. The Madrid Protocol becomes open to a review conference
42. Southern Ocean
43. Antarctic Blue Whale (B. m. intermedia)
44. Antarctic Summer Feeding Migration
45. South Georgia
46. Southern Ocean Whale Sanctuary
47. Seasonal Krill Aggregation
48. The factory ship Lancing takes a stern slipway south
49. The Antarctic blue whale catch reaches its all-time peak
50. The Southern Ocean Whale Sanctuary is adopted
51. Dedicated Antarctic Blue Whale Project voyages
52. Baleen whale consumption is re-measured, and the krill paradox sharpens
53. The only published Antarctic blue whale satellite tracks are released as data
54. Antarctic Krill (Euphausia superba)
55. Arctic Tern (Sterna paradisaea)
56. CCAMLR is agreed at Canberra
57. A long-term decline in krill density is linked to winter sea ice
58. CCAMLR adopts the Ross Sea marine protected area
59. Antarctic sea ice reaches a record low, a year after the previous one
60. Antarctic Circumpolar Current (ACC)
61. Antarctica
62. Thermohaline Circulation
63. North Atlantic — Grand Banks approaches
64. Weddell Sea
65. A circumpolar current becomes possible
66. Antarctic meltwater is projected to slow the abyssal cell
67. A physics-based early warning signal is proposed
68. Evidence
69. A continuous, consistently processed record of sea-ice extent in both hemispheres exists from 1979, from which the Arctic September minima of 2007 (approximately 4.2 million km2) and 2012 (approximately 3.4 million km2) and the Antarctic February minima of 2022 and 2023 (the first below 2 million km2 in the record, and lower again the following year) are drawn. V55 VERIFICATION BASIS: nsidc.org was probed during production and refused by the network egress proxy, and the WebSearch budget was exhausted. EVERY NUMERIC VALUE IN THIS RECORD IS APPROXIMATE AND UNCHECKED, given to one or two significant figures for that reason. A curator must replace them with values read from the Sea Ice Index before publication.