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Don’t Believe The Alarmist Hype About Antarctica’s Melting Glaciers

by Steven Koonin
September 20, 2022, 10:30 AM
in News and Opinion
Reading Time: 4 mins read
A A
9

Antarctica adele penguinsAlarming reports that the Antarctic ice sheet is shrinking misrepresent the science underway to understand a very complex situation. Antarctica has been ice-covered for at least 30 million years.

The ice sheet holds about 26.5 million gigatons of water (a gigaton is a billion metric tons, or about 2.2 trillion pounds). [bold, links added]

If it were to melt completely, sea levels would rise by 190 feet. Such a change is many millennia in the future—if it comes at all.

Much more modest ice loss is normal in Antarctica. Each year, some 2,200 gigatons (or 0.01%) of the ice is discharged in the form of melt and icebergs, while snowfall adds almost the same amount.

The difference between the discharge and addition each year is the ice sheet’s annual loss. That figure has been increasing in recent decades, from 40 gigatons a year in the 1980s to 250 gigatons a year in the 2010s.

But the increase is a small change in a complex and highly variable process. For example, Greenland’s annual loss has fluctuated significantly over the past century.

And while the Antarctic losses seem stupendously large, the recent annual losses amount to 0.001% of the total ice and, if they continued at that rate, would raise sea levels by only three inches over 100 years.

Many fear that a warming globe could cause glaciers to retreat rapidly, increasing discharge and causing more rapid sea-level rise.

To get beyond that simplistic picture, it is important to understand how glaciers have flowed in the past to predict better whether they might flow faster in the future.

Two recent studies reported in the media focus on the terminus of glaciers—i.e., where the ice, the ocean, and the ground come together.

One study used an underwater drone to map the seabed at a depth of 2,000 feet, about 35 miles from the terminus of the Thwaites Glacier in Antarctica. Detailed sonar scans showed a washboard pattern of ridges, most less than 8 inches high.

The ridges are caused by daily tides and serve as a record of where ice touched the seabed in the past.

Researchers could read that record to infer that at some time in the past the glacier retreated for half a year at more than twice the fastest rate observed between 2011 and 2019.

The cause of the specific event at the Thwaites Glacier remains unknown, in part because the time of the rapid retreat hasn’t yet been determined. It likely happened more than 70 years ago, if not several centuries ago.

But the media goes with this angle: “A ‘doomsday glacier’ the size of Florida is disintegrating faster than thought.” A correct headline would read: “Thwaites Glacier retreating less than half as rapidly today as it did in the past.”

A second study tested the idea that freshwater from the melting of one glacier could be carried by currents along the shore to accelerate the discharge of nearby glaciers.

Because global climate models are insufficiently detailed to describe the ocean near the coast, researchers constructed a special model to prove their idea.

If ocean currents can connect the discharges of distant glaciers, that would add to the complexity and variability of changes in the Antarctic ice sheet.

Under scenarios deemed likely by the United Nations’ Intergovernmental Panel on Climate Change (IPCC), a connection between ocean currents and discharge would increase the overall discharge rate in one region of the continent by some 10% by the end of the century.

But to emphasize the idea being tested, the modelers used human influences almost three times larger.

Even though that fact is stated in the paper, reporters rarely catch such nuance, and the media goes with headlines such as “Antarctic Ice Melting Could Be 40 Percent Faster Than Thought” with the absurd statement that “a massive tsunami would swamp New York City and beyond, killing millions. London, Venice, and Mumbai would also become aquariums.”

A more accurate headline would read: “Ocean currents connecting Antarctic glaciers might accelerate their melting.”

These two studies illustrate the progress being made in understanding a dauntingly complex mix of ice, ocean, land, and weather, with clever methods to infer past conditions and sophisticated computer modeling to show potential future scenarios.

These papers describe the science with appropriate precision and caveats, but it is a shame that the media misrepresents the research to raise alarm.

That denies the public the right to make informed decisions about “climate action,” as well as the opportunity to marvel at the science itself.


Mr. Koonin is a professor at New York University, a senior fellow at the Hoover Institution, and the author of “Unsettled: What Climate Science Tells Us, What It Doesn’t, and Why It Matters.”

Read more at WSJ

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Comments 9

  1. Spurwing Plover says:
    3 years ago

    If a Arctic tern could talk he would say the ice is Not Melting so would the Penguins and Skuas and Giant Southern Petrels

    Reply
    • Ian Sloan says:
      3 years ago

      He might say “what the hell am I doing in the Antarctic?” though

      Reply
  2. Graham McDonald says:
    3 years ago

    “… a dauntingly complex mix of ice, ocean, land, and weather …”

    One word missing from the list, “volcanos”, under the ice sheet.

    Reply
    • Colin Harkin says:
      3 years ago

      Correct Graham. What should have been included is that the Great Western Ice Sheet is growing (it could be the Eastern Sheet?) however the losses are exceeded by the gains in Antartica.
      One side of Antartica has many sub glacial volcanos below and for those who aren’t aware, these volcanos are not the same type that blow debri miles into the air. They are more like the bubbling molten lava kind that we see in Hawaii. By comparison, they are cool volcanos – can you imagine that? That said, the volcanic affect isn’t sufficient to cause the ice above, which is kilometres thick, to melt at a faster rate.
      Summed up, what little melt happens in one part of Antartica is more that made up for growing ice accumulations in other parts.

      Reply
  3. Randy Verret says:
    3 years ago

    I read Dr. Koonin’s recent book “Unsettled” and every American should read it. It presents a balanced, thoughtful & informed look at the currently understood climate science. Yes, the world is modestly warming but the debate over the role of CO2 in that trend is far from “settled” science. We need more moderate, sensible voices like professor Koonin weighing into the discussion and particlarily in the formation of environmental policy. Enough FEAR PORN!

    Reply
    • Chuck Bird says:
      3 years ago

      Why just every American? How about King Charles III?

      Reply
      • Randy Verret says:
        3 years ago

        All we can control is our domestic agenda. If the EU & others want to continue to pursue the “Green Dream,” go right ahead…

        Reply

Comments are welcome! Those that add no discussion value may be removed.Cancel reply

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