Science

Deep reefs provide corals little refuge from extreme ocean heat

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Briefings

A new study published in Geophysical Research Letters indicates that deep reefs, located between 90 and 150 meters underwater, are no longer safe havens for corals against extreme ocean heat. This finding challenges previous assumptions about these zones as climate refuges, suggesting they are now exposed to the same intense marine heat waves that affect shallower reefs.

Key points

• Deep reefs at 90-150 meters depth are no longer sheltered from intense marine heat waves.
• The study concludes that these zones are no longer safe havens for corals in a warming climate.

Context

This research challenges the long-held belief that deep reefs serve as climate refuges for corals, as they are now exposed to the same extreme marine heat waves affecting shallower reef systems.

Limitations

The study is a preprint in Geophysical Research Letters, and the evidence is limited to the specific depth range of 90-150 meters without broader geographic scope or long-term data validation.

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