Climate refugia in the Great Barrier Reef may endure into the future
Chaojiao Sun1, Craig Steinberg2, Eduardo Klein Salas2,3
1CSIRO Environment, Perth, Western Australia, Australia.
Science Advances
|November 29, 2024
Summary
Climate refugia in the Great Barrier Reef (GBR) offer thermal relief for corals. These areas, cooled by upwelling, are projected to remain cooler than surrounding waters until at least the 2080s, aiding reef survival.
Area of Science:
- Marine Biology
- Oceanography
- Climate Science
Background:
- Global warming causes frequent mass coral bleaching events worldwide.
- Certain areas of the Great Barrier Reef (GBR) have shown resilience to severe bleaching.
- Climate refugia, characterized by cooler upwelling waters, have been identified as key to this resilience.
Purpose of the Study:
- To investigate the future status of two large climate refugia within the GBR.
- To model the impact of a high-emission scenario on these refugia.
- To assess the long-term thermal buffering capacity of these regions.
Main Methods:
- Utilized a high-resolution nested regional ocean model.
- Analyzed model projections under a high-emission scenario.
- Examined the interaction of tides, currents, and reef structures driving upwelling.
Main Results:
- Upwelling mechanisms are projected to remain active in a warming climate.
- These refugia are likely to stay over 1°C cooler than surrounding waters until at least the 2080s.
- The identified refugia provide significant thermal relief to corals.
Conclusions:
- The GBR's climate refugia are likely to persist, offering crucial thermal buffering.
- Identification and protection of these refugia are vital for coral acclimatization and adaptation.
- These resilient areas can serve as source populations for replenishing the wider reef ecosystem.
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