The third global bleaching event
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.
Observed — measured or witnessed, with the observation cited.
Subjects
- Coral bleaching · ecological phenomenon · Global tropical reefs · not located
- NOAA Coral Reef Watch · research programme · United States · not located
Evidence
Partly verified — Core facts are sourced; some optional detail is deliberately absent.
NOAA Coral Reef Watch satellite thermal stress products: HotSpot, Degree Heating Weeks and Bleaching Alert Areas
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.
NOAA Coral Reef Watch, National Environmental Satellite, Data, and Information Service · operational, continuously updated · Partly verified
NOAA Coral Reef Watch product documentation and methodology pages (coralreefwatch.noaa.gov). NOT RETRIEVED: the domain is blocked by this session's egress proxy.
Recorded on Coral bleaching
- The first global mass bleaching event
- A published projection that reefs would bleach faster than they could recover
- The third global bleaching event
- Mass bleaching on the Great Barrier Reef
- A second consecutive year of mass bleaching on the Great Barrier Reef
- The interval between severe bleaching events is measured, and it has collapsed
- The fourth global bleaching event is confirmed
Related
Related because they share a subject in the Atlas — never because the text looks similar.
- The fourth global bleaching event is confirmed · 2024-04
- The interval between severe bleaching events is measured, and it has collapsed · 2018-01
- A second consecutive year of mass bleaching on the Great Barrier Reef · 2017
- Mass bleaching on the Great Barrier Reef · 2016-03 to 2016-04
- A published projection that reefs would bleach faster than they could recover · 1999
- The first global mass bleaching event · 1998