Antarctic Sea Ice Is “Astonishingly” Low This Melt Season

Scientists aren’t sure if this trend will continue.

DeAgostini/Getty Images

For indispensable reporting on the coronavirus crisis, the election, and more, subscribe to the Mother Jones Daily newsletter.

This story was originally published by Grist. It appears here as part of the Climate Desk collaboration.

Right now, on the shores of Antarctica, there’s open water crashing against the largest ice shelf in the world. The annual ice-free season has begun at the Ross Ice Shelf—a month ahead of schedule.

The frozen region of freshwater ice the size of France partially protects the West Antarctic Ice Sheet from collapsing into the sea. In recent years, the ice-free season in the Ross Sea has become a routine event—but it happened this year on New Year’s Day, the earliest time in history.

“Antarctic sea ice extent is astonishingly low this year, not just near the Ross Ice Shelf, but around most of the continent,” says Cecilia Bitz, a polar scientist at the University of Washington.

In recent years, scientists have set up seismic monitoring stations on the ice shelf to track the wave energy as it percolates inland, potentially causing stress fractures on the Ross Ice Shelf along the way.

Bitz pointed to low ice concentration also happening right now in the Amundsen Sea, more than 1,000 miles away from Ross, and that’s potentially even more worrying. In a worst-case scenario, with continued business as usual greenhouse gas emissions, ice shelves all across West Antarctica could collapse within decades, melted from above and below and shattered by wave action.

After that, it would probably be just a matter of time before West Antarctica’s massive land-based glaciers, like the “Doomsday glaciers” at Thwaites and Pine Island, collapse as well, sending sea levels upward by as much as 10 feet and flooding every coastal city on Earth.

Sea ice concentration on January 1, 2019. The Ross Sea is on the lower edge of West Antarctica and Amundsen is north and near this map’s West Antarctica labeling. National Snow & Ice Data Center

Across the entire continent, there are more than 750,000 square miles of sea ice missing, a record deficit for this time of year. Because it’s approaching mid-summer in the Southern Hemisphere, Antarctica will keep shedding sea ice for about another six weeks or so, and is currently on pace to drop far below the all-time record low set in 2016.

The North Pole and South Pole are both very cold, of course, but they couldn’t be more different in how climate change is affecting them.

The Arctic is an ocean fringed by cold continents, and has already passed a tipping point. Sea ice there has been declining sharply for decades—so much so that about a year ago, scientist declared the start of a “New Arctic,” with conditions likely unseen in at least 1,500 years, and probably much, much longer.

Owing to its unique geography (a cold continent fringed by a relatively warmer ocean), sea ice in the Antarctic region has long been considered something of a climate wildcard. A sharp decline in the Antarctic began only two years ago, and scientists aren’t sure yet if it will continue. If 2019 and the rapidly warming Southern Ocean is any indication, it will.

More MotherJones reporting on Climate Desk

SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

payment methods

SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate