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Scientists Launch World's First Satellite System to Watch Over Reefs

22/05/2021
Coral bleaching at Heron Island, February 2016. Photo: stopadani/Flickr, CC BY 2.0
While coral reefs throughout the Indo-Pacific region have been bleaching in response to rising sea temperatures, the reefs around Marovo Lagoon in the Solomon Islands have mostly kept their color. But in March 2021, that all changed: the lagoon’s once-healthy reefs turned ghostly white as the water temperature rose to new highs, much to the distress of conservationists.
Coral bleaching – when rising temperatures push corals to expel their life-sustaining algae – has become a problem in just about every part of the world. Some models predict that 70% to 90% of the world’s coral reefs will be lost in a mere 30 years if action isn’t taken to mitigate the effects of climate change and other anthropogenic pressures on the ocean, such as coastal development and unsustainable fishing practices. ....

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Spotting coral bleaching from space

Spotting coral bleaching from space
First global satellite network is now scanning coral reefs in real-time.
The Allen Coral Atlas Monitoring System, New Caledonia on April 26, 2021.
A world-first space-based coral reef monitoring project has just got off the ground – literally. The Allen Coral Atlas project is now using high-resolution satellites to scan nearly a quarter of a million reefs across the globe – from space – to monitor coral-killing bleaching events in real-time.
“The current prognosis for the world’s coral reefs is bleak,” says remote sensing expert Chris Roelfsema from the University of Queensland (UQ). “With ever-warming, more polluted and acidic oceans, models predict that 70 per cent to 90 per cent of coral reefs will be lost by 2050. Until now, there hasn’t been a global system in place to monitor coral reefs under the stresses that may lead to their deaths.” ....

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Satellites keep watch over global reef health in a world first

While coral reefs throughout the Indo-Pacific region have been bleaching in response to rising sea temperatures, the reefs around Marovo Lagoon in the Solomon Islands have mostly kept their color. But in March 2021, that all changed: the lagoon’s once-healthy reefs turned ghostly white as the water temperature rose to new highs, much to the […] ....

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Space satellites hold the secret to saving the world's coral reefs

We know that coral reefs are extremely important for marine biodiversity. They house a quarter of all marine species and provide food, livelihoods, security and recreation for at least a billion people.
But one thing which isn’t fully understood yet is why some patches of coral in the south Atlantic Ocean have shown to be more
resistant to climate change.
The
Allen Coral Atlas project (ACA) which was created by the late Microsoft co-founder, Paul Allen, has set out to solve these mysteries, so that policies to protect the world’s coral reefs can be better informed.
Allen, who was a keen scuba diver himself, sadly died in 2018, but his legacy lives on in the ACA. “As a technologist, [Allen] saw tremendous data gaps and challenged us to figure out how to apply the emerging availability of satellite imagery to map and monitor the world’s coral reefs. All of them,” says Paulina Gerstner, the Allen Coral Atlas Program Manager. ....

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The plan to map every coral reef on Earth – from space

The plan to map every coral reef on Earth – from space
Photo by Hoodh Ahmed/ Unsplash / 07 Jan 2021
In October 2020, Australian scientists found a detached coral reef skyscraper on Australia’s Great Barrier Reef nearly 500 meters tall and 1.5 kilometres wide that exceeds the height of the Eiffel Tower and New York’s Empire State Building. This was the first discovery of its kind in 120 years.
It also signals a challenge – that we know relatively little about what lies underwater, given the high costs and still-nascent technology of ocean exploration.
To better understand the mysteries of the world’s oceans, a team of scientists is using satellite imaging to map out, in unprecedented detail, one of the planet’s most iconic underwater ecosystems: the shallow coral reef. ....

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