NOAA Coral Reef Watch

Assembled from 23 blocks · 1 evidence · 12 related

1. Story
2. The United States National Oceanic and Atmospheric Administration programme that produces global satellite-based reef thermal stress products in near real time, and the reason bleaching risk is a forecast rather than a post-mortem. Its outputs are the sea surface temperature anomaly, the HotSpot, the accumulated Degree Heating Weeks, and the derived bleaching alert levels, published on a global grid and refreshed continuously. Two properties make it consequential beyond monitoring. It is public and global, so a reef manager in a country with no oceanographic capacity sees the same product as one in Australia; and because the alert is issued from satellite data before divers see anything, it converts reef management from response into anticipation — closing a site, deploying survey teams, or moving nursery stock ahead of a predicted event. Coral Reef Watch is also the body whose products underpin the declaration of global bleaching events, jointly with the International Coral Reef Initiative.
3. Knowledge
4. Degree Heating Weeks (DHW)
5. NOAA Coral Reef Watch
6. The fourth global bleaching event is confirmed
7. Connections
8. The fourth global bleaching event is confirmed
9. Degree Heating Weeks (DHW)
10. The third global bleaching event
11. The fourth global bleaching event is confirmed
12. The current state of the fourth global bleaching event is not established in this package
13. NOAA Coral Reef Watch
14. International Coral Reef Initiative
15. NOAA Coral Reef Watch
16. International Coral Reef Initiative
17. Coral bleaching
18. Degree Heating Weeks (DHW)
19. Coral bleaching
20. NOAA Coral Reef Watch
21. The fourth global bleaching event is confirmed
22. Evidence
23. 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.