The third global bleaching event

Assembled from 31 blocks · 1 evidence · 18 related

1. Story
2. The longest and, to that date, most widespread global bleaching event, running across three consecutive northern summers and declared by NOAA during its course. It differed from 1998 and 2010 in duration rather than only in extent: reefs that bleached in one year were still under thermal stress in the next, so the recovery interval within the event was itself near zero.
3. Knowledge
4. Coral bleaching
5. NOAA Coral Reef Watch
6. The third global bleaching event
7. Connections
8. Coral bleaching
9. NOAA Coral Reef Watch
10. Reef-building corals (Scleractinia)
11. Marine heatwave
12. Degree Heating Weeks (DHW)
13. Symbiont shuffling and thermal tolerance
14. The first global mass bleaching event
15. A published projection that reefs would bleach faster than they could recover
16. The second global bleaching event
17. The third global bleaching event
18. Mass bleaching on the Great Barrier Reef
19. A second consecutive year of mass bleaching on the Great Barrier Reef
20. The interval between severe bleaching events is measured, and it has collapsed
21. Mass bleaching on the Great Barrier Reef during a La Nina
22. The fourth global bleaching event is confirmed
23. The fifth mass bleaching on the Great Barrier Reef since 2016
24. The current state of the fourth global bleaching event is not established in this package
25. The fourth global bleaching event is confirmed
26. Degree Heating Weeks (DHW)
27. The third global bleaching event
28. The fourth global bleaching event is confirmed
29. The current state of the fourth global bleaching event is not established in this package
30. Evidence
31. Reef thermal stress is measured as HotSpot (sea surface temperature above the local maximum monthly mean) accumulated over a rolling twelve-week window into Degree Heating Weeks, with roughly four DHW indicating likely significant bleaching and roughly eight indicating likely widespread bleaching and mortality. V55 verification basis: the product documentation was NOT retrieved — coralreefwatch.noaa.gov was refused by the egress proxy — and these definitions and thresholds are stated from the producing model's working knowledge of the products. Any alert levels added above Level 2 are not described here.