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Ladybbird · 31-12-23, 15:48

RED Alert in Antarctica: The Year Rapid, Dramatic Change Hit Climate Scientists Like a Punch in The Guts

Study after study showed the breakdown of climate systems taking place much earlier than foreseen, with potentially catastrophic results

The Guardian 31 DEC 2023

Research suggests that accelerated melting of ice shelves over the Amundsen Sea in west Antarctica is locked in and beyond human control for the rest of this century, even if emissions are significantly reduced

Morning is a construct in the Antarctic summer. It’s 7.30am and Nerilie Abram, a climate science professor at the Australian National University, is having breakfast at Casey station when she takes Guardian Australia’s call in late November. The sun barely kissed the horizon the night before, and won’t fall below it for weeks.

Constant daylight can be famously discombobulating for first-time visitors to Antarctica, but for experienced researchers such as Abram, it is just the backdrop to life at the end of the Earth. This year, though, something else is deeply strange.

When Abram was here a decade ago there was a mass of ice floating off the coast. It’s a vastly altered scene when she looks out the window now. “There’s no sea ice at all,” she says. “It’s a magnificent landscape. To think about what we’re doing to it and the changes that are happening here, it’s a punch in the guts.”

That punch has winded scientists and policymakers across the planet this year. As the hottest year on record crawls to its finish line, they have been asking: is 2023 the year humanity put its stamp on Antarctica in ways that will be felt for centuries to come?

The southern continent has suffered dramatic shifts that raise serious concerns about its immediate health. They have coincided with evidence that longer-term transformations linked to the climate crisis have started much sooner than it was assumed was likely.

The changes have ramifications for local wildlife, but also for people across the globe in ways that are often less well understood.

A Catalogue of Concern

Antarctic sea ice cover crashed for six months straight, to a level so far below anything else on the satellite record that scientists struggled for adjectives to describe what they were witnessing.

While the full effect is yet to be documented, a peer-reviewed paper in August gave some insight into what it might mean. Examining satellite images, researchers from the British Antarctic Survey found that the then record drop in sea ice in late 2022 – before this year’s larger slump – could have killed thousands of emperor penguin chicks. The usually stable sea ice that colonies rely on to rear their young in the Bellingshausen Sea just wasn’t there, likely causing a “catastrophic breeding failure”.

Emperor penguin breeding failures in the Bellingshausen Sea are ‘without precedent’ as multiple colonies all failed in a single season.

That event in the west of the continent followed parts of the east – the coldest place on Earth – last year recording what scientists think is the biggest heatwave ever recorded, with temperatures peaking at 39C above normal.

Looking ahead, a study published in Nature in March found meltwater from the continent’s ice sheets could dramatically slow down the Southern Ocean overturning circulation, a deep ocean current, by 2050 if greenhouse gas emissions continued at their current level.

Two months later, a paper by some of the same researchers estimated the circulation, which influences global weather patterns and ocean temperatures and nutrient levels, had already slowed by about 30% since the 1990s.

Scientists Sound Alarm on Global Consequences as Antarctic Ice Melt Accelerates

What Russia Just Discovered In Antarctica TERRIFIES EVERYONE!

How Earth Would Look If All The Ice Melted

MORE;
Full Story revisited: Where did all the Antarctic sea ice go?

.

31-12-23, 15:48	#1
Ladybbird Join Date: Feb 2011 Posts: 47,648 Thanks: 27,646 Thanked 14,458 Times in 10,262 Posts Awards Showcase Total Awards: 8	RED Alert in Antarctica: Rapid Change Hit Scientists Like Punch in The Guts RED Alert in Antarctica: The Year Rapid, Dramatic Change Hit Climate Scientists Like a Punch in The Guts Study after study showed the breakdown of climate systems taking place much earlier than foreseen, with potentially catastrophic results The Guardian 31 DEC 2023 Research suggests that accelerated melting of ice shelves over the Amundsen Sea in west Antarctica is locked in and beyond human control for the rest of this century, even if emissions are significantly reduced Morning is a construct in the Antarctic summer. It’s 7.30am and Nerilie Abram, a climate science professor at the Australian National University, is having breakfast at Casey station when she takes Guardian Australia’s call in late November. The sun barely kissed the horizon the night before, and won’t fall below it for weeks. Constant daylight can be famously discombobulating for first-time visitors to Antarctica, but for experienced researchers such as Abram, it is just the backdrop to life at the end of the Earth. This year, though, something else is deeply strange. When Abram was here a decade ago there was a mass of ice floating off the coast. It’s a vastly altered scene when she looks out the window now. “There’s no sea ice at all,” she says. “It’s a magnificent landscape. To think about what we’re doing to it and the changes that are happening here, it’s a punch in the guts.” That punch has winded scientists and policymakers across the planet this year. As the hottest year on record crawls to its finish line, they have been asking: is 2023 the year humanity put its stamp on Antarctica in ways that will be felt for centuries to come? The southern continent has suffered dramatic shifts that raise serious concerns about its immediate health. They have coincided with evidence that longer-term transformations linked to the climate crisis have started much sooner than it was assumed was likely. The changes have ramifications for local wildlife, but also for people across the globe in ways that are often less well understood. A Catalogue of Concern Antarctic sea ice cover crashed for six months straight, to a level so far below anything else on the satellite record that scientists struggled for adjectives to describe what they were witnessing. While the full effect is yet to be documented, a peer-reviewed paper in August gave some insight into what it might mean. Examining satellite images, researchers from the British Antarctic Survey found that the then record drop in sea ice in late 2022 – before this year’s larger slump – could have killed thousands of emperor penguin chicks. The usually stable sea ice that colonies rely on to rear their young in the Bellingshausen Sea just wasn’t there, likely causing a “catastrophic breeding failure”. *Emperor penguin breeding failures in the Bellingshausen Sea are ‘without precedent’ as multiple colonies all failed in a single season.* That event in the west of the continent followed parts of the east – the coldest place on Earth – last year recording what scientists think is the biggest heatwave ever recorded, with temperatures peaking at 39C above normal. Looking ahead, a study published in Nature in March found meltwater from the continent’s ice sheets could dramatically slow down the Southern Ocean overturning circulation, a deep ocean current, by 2050 if greenhouse gas emissions continued at their current level. Two months later, a paper by some of the same researchers estimated the circulation, which influences global weather patterns and ocean temperatures and nutrient levels, had already slowed by about 30% since the 1990s. Scientists Sound Alarm on Global Consequences as Antarctic Ice Melt Accelerates What Russia Just Discovered In Antarctica TERRIFIES EVERYONE! How Earth Would Look If All The Ice Melted MORE; *Full Story revisited: Where did all the Antarctic sea ice go?* .

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