‘The Fuse Has Been Blown,’ and the Doomsday
Glacier Is Coming for Us All
New data suggests a massive collapse of the ice shelf
in as little as five years. “We are dealing with an event that no human has
ever witnessed,” says one scientist. “We have no analog for this”
By JEFF
GOODELL
One thing
that’s hard to grasp about the climate crisis is that big changes can happen
fast. In 2019, I was aboard the Nathaniel B. Palmer, a 308-foot-long scientific
research vessel, cruising in front of the Thwaites Glacier in Antarctica. One
day, we were sailing in clear seas in front of the glacier. The next day, we
were surrounded by icebergs the size of aircraft carriers.
As we later
learned from satellite images, in a matter of 48 hours or so, a mélange of ice
about 21 miles wide and 15 miles deep had cracked up and scattered into the
sea.
It was a
spooky moment. Thwaites Glacier is the size of Florida. It is the cork in the
bottle of the entire West Antarctic ice sheet, which contains enough ice to
raise sea levels by 10 feet. The mélange that disintegrated was not part of the
glacier itself, but a mix of icebergs and sea ice that had cozied up next to
it. Still, the idea that it could just fall apart overnight was mind-blowing.
The
research vessel ‘Nathaniel B. Palmer’ was surrounded overnight by icebergs
while exploring the Thwaites Glacier in 2019.
As it turns
out, the ice breakup I witnessed was not a freak event. A few weeks ago,
scientists participating in the International Thwaites Glacier Collaboration, a
$25 million five-year-long joint research program between the National Science
Foundation in the U.S. and the Natural Environment Research Council in the
U.K., presented their latest research. They described the discovery of cracks
and fissures in the Thwaites eastern ice shelf, predicting that the ice shelf
could fracture like a shattered car window in as little as five years. “It
won’t scatter out into sea as quickly as what you saw when you were down
there,” Erin Pettit, a glaciologist at Oregon State University and one of the
lead principal investigators in the ITGC, later told me. “But the basic process
is the same. The ice shelf is breaking up and could be gone in less than a
decade.”
Given the
ongoing war for American democracy and the deadly toll of the Covid pandemic,
the loss of an ice shelf on a far-away continent populated by penguins might
not seem to be big news. But in fact, the West Antarctic ice sheet is one of
the most important tipping points in the Earth’s climate system. If Thwaites
Glacier collapses, it opens the door for the rest of the West Antarctic ice
sheet to slide into the sea. Globally, 250 million people live within three
feet of high tide lines. Ten feet of sea level rise would be a world-bending
catastrophe. It’s not only goodbye Miami, but goodbye to virtually every
low-lying coastal city in the world.
But
predicting the breakup of ice sheets and the implications for future sea level
rise is fraught with uncertainty. Depending on various emissions scenarios in
the latest Intergovernmental Panel on Climate Change report, we could have as
little as one foot of sea level rise by the end of the century, or nearly six
feet of sea level rise (of course, rising seas won’t stop in 2100, but that
date has become a common benchmark). “The difference between those [models] is
a lot of lives and money,” says Richard Alley, a glaciologist at Penn State
University and one of the great ice scientists of our time. Alley adds: “The
most likely place to generate [the worst scenario] is Thwaites.”
Or to put
it more urgently: “If there is going to be a climate catastrophe,” Ohio State
glaciologist Ian Howat once told me, “it’s probably going to start at
Thwaites.”
The problem
is, understanding what’s going on at Thwaites is fiendishly complex. As I wrote
in 2017:
The trouble
with Thwaites, which is one of the largest glaciers on the planet, is that it’s
also what scientists call “a threshold system.” That means instead of melting slowly
like an ice cube on a summer day, it is more like a house of cards: It’s stable
until it is pushed too far, then it collapses.
Thwaites is
very different from other big glaciers, such as those in Greenland. For one
thing, it is not melting from above, due to warmer air temperatures. It’s
melting from below, due to warmer ocean water eating away at its underbelly.
More importantly, the terrain beneath the West Antarctic ice sheet is peculiar.
“Think of it as a giant soup bowl filled with ice,” Sridhar Anandakrishnan, an
expert in polar glaciology at Penn State University, once told me. In the bowl
analogy, the edge of the glacier — the spot where a glacier leaves the land and
begins to float — is perched on the lip of the bowl 1,000 feet or more below
sea level. Scientists call that lip the “grounding line.” Below the lip, the
terrain falls away on a downward slope for hundreds of miles, all the way to
the Transantarctic Mountains that divide East and West Antarctica. At the
deepest part of the basin, the ice is about two miles thick.
What this
means is that once the warm water gets below ice, it can flow down the slope of
the bowl, weakening the ice from below. Through a mechanism called “marine
ice-cliff Instability,” you can get what amounts to a runaway collapse of the
ice sheet that could raise global sea levels very high, very fast.
That’s why,
when I wrote my 2017 Rolling Stone story about Thwaites, I dubbed it “The
Doomsday Glacier.” (The name stuck — if you type the phrase into Google now,
you get half a million hits.)
In a
worst-case scenario, how fast could Thwaites collapse? No one knows. The IPCC
data is the best guide for sea level rise for the rest of this century,
although Alley cautions me that even six feet of sea level rise by 2100 is not
the worst-case scenario.
“We just
don’t know what the upper boundary is for how fast this can happen,” Alley
says. “We are dealing with an event that no human has ever witnessed before. We
have no analog for this.”
In the past
few years, scientists have made a lot of progress in understanding the dynamics
of Thwaites. On our 2019 cruise, scientists discovered troughs in the seabed
that allowed warm water to flow underneath the ice shelf. Scientists have
mapped the underside of the glacier itself, tracked crevasses in the ice shelf,
and located pinning points that might slow the retreat of the ice. The change
has been dramatic: “The net rate of ice loss from Thwaites Glacier is more than
six times what it was in the early 1990s,” says Rob Larter, a geophysicist with
the British Antarctic Survey who was the chief scientist on my trip to
Antarctica in 2019.
The recent
news about Thwaites’ eastern ice shelf breaking up in the next five years was
not really a surprise to anyone who has been tracking the science closely.
After the sudden disintegration of the Larsen B ice shelf in 2002, scientists
realized that Antarctica was far less stable than many had believed. The
discovery of cracks and fissures at Thwaites further underscore just how
dynamic the changes already underway are.
A newly
discovered fissure in the Thwaites ice shelf. Scientists predict the shelf
could crack like a car window in five years.
To be
clear, there is a big difference between an ice shelf and the glacier itself.
The ice shelf is like a thumbnail that grows out from the glacier and floats on
the ocean. Because it is already floating, when it melts it doesn’t in itself
contribute to sea level rise (just as when ice cubes melt in your glass, they
don’t raise the level of liquid).
But ice
shelves are important because they buttress glaciers. Like the flying
buttresses of Notre Dame, they give the walls of ice stability. And when they break
up, the land-based glacier is free to flow much faster into the sea. And that
does raise sea levels.
So yeah, if
Thwaites loses a significant part of its ice shelf in five years, that’s a big
deal.
But even if
a big part of the ice shelf does crack up, there is a lot of unknown complexity
in how it will play out. “A first question is, if the ice-shelf breakage
continues, will the whole ice shelf be lost, or will a short ice shelf remain,
at least in some places?” Richard Alley emailed me. “Almost all ice-shelf ice
is buttressing, generating friction that holds back the non-floating ice, so
loss of part, most or all of the ice shelf will increase flow of non-floating
ice into the ocean. But the most-important buttressing tends to arise closest
to the grounding zone, so if a short ice shelf does remain, it may still
provide important buttressing, and the speedup of flow and thinning will be
smaller than they could be with full ice-shelf loss.”
Here you
see the problem. Even predicting how the crackup of the ice shelf will impact
the flow of the glacier is difficult to estimate.
And this is
only one of the uncertainties that scientists face when trying to predict
whether or not Miami will be underwater by 2100. There is further uncertainty
in exactly where and when the ice will fracture, how much warm water will be
pushed up beneath the glacier by changing winds and ocean currents, how the
character of the bed the glacier rests on will speed up or slow down the
glacier’s slide into the sea. Whether the bed is hard rock or muddy till can
have a big impact on the velocity of the glacier, just as the texture of snow
affects how fast you ski down a mountain. “Ice is alive,” says Pettit. “It
moves and flows and breaks in ways that are difficult to anticipate.”
Paradoxically,
the more scientists learn about what’s going on at Thwaites, the more divergent
the latest climate models have become about its future. Consider the results of
two models by highly respected scientists published side by side in Nature earlier
this year. One model suggests that Thwaites stays fairly stable until
temperatures rise above 2 C of warming. Then all hell breaks loose. Thwaites
begins to fall into the sea like a line of dominoes pushed off a table and soon
takes the rest of the West Antarctic ice sheet with it. And once the collapse
begins, according to this model, it will be impossible to stop — at least on
any human time scale. In a century or so, global sea levels could rise 10 feet,
which would swamp South Florida and Bangladesh and many other low-lying regions
of the world.
In the
other model, global sea level rise only differs by 4½ inches between a 1.5 C
global temperature rise and a 3 C temperature rise (which is a little above
where we are headed with under current emissions scenarios). And much of that
comes from increased melt in Greenland and mountain glaciers. As for
Antarctica, the paper says explicitly: “No clear dependence on emissions
scenario emerges for Antarctica.”
So what to
make of all this?
“The
current divergence among model predictions is actually a good sign because it
means that scientists are probing different parameterizations, representations
of processes, and hypotheses,” writes Jeremy Bassis, a geophysicist at the
University of Michigan. Bassis suggests not focusing so much on the long-term
uncertainty and highlighting instead what scientists know about the next few
decades. “The skill of models in predicting sea level change on decadal time
scales is high, and we already have actionable projections on these time
scales. We should be emphasizing that fact in discussions with community
members, stakeholders, and decision-makers, so they can move ahead with
important adaptation and mitigation planning.”
But in the
long run, it is not clear that the dynamics of ice sheet collapse that are
underway at Thwaites can be stopped. As glaciologist Eric Rignot put it in
2015, in Antarctica, “the fuse has been blown.” Even if we cut carbon emissions
to zero tomorrow, warm water will continue to flow beneath the ice sheet for
decades, destabilizing the ice and further pushing the glacier toward eventual
collapse. This doesn’t means that cutting carbon pollution to zero isn’t an
important goal — nothing, in fact, is more important or more urgent. “We may
have a small safety margin in Antarctica, but not a large one,” says Alley.
Even if the fuse is blown, cutting emissions fast could slow it all down to a
millennium-long crack-up that will give us more time to adapt. One way or
another, our future is written in ice.
Contributing
editor Jeff Goodell has written extensively about the Doomsday Glacier. You can
listen to an audio account of his trip to Thwaites here.
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