June 22, 2018

Warming in the north continues as predicted

Posted by larryohanlon

Frozen ground underlying the North Slope of Alaska is warming; much of it may thaw by the end of the century. Photo by Ned Rozell.

By Ned Rozell

Just outside my window here at the University of Alaska Fairbanks, workers are drilling into the asphalt of a parking lot using a truck-mounted rig. They twist a hollow bit 25 feet into the ground and pull up hard, clear evidence of why the blacktop is sinking.

A few days ago, John Walsh gave a talk a few hundred steps from that parking lot. Walsh has spent 17 years in Fairbanks studying Arctic climate and learning about the latest physical changes in the far north. He is the chief scientist of the International Arctic Research Center, and an expert on global warming as it applies to the Arctic and subarctic.

Back in the parking lot, an engineer guiding the work watches the drillers hit clear discs of ice, about 7 feet below car level. The ice had been solid for centuries, maybe thousands of years, but the construction of a parking lot in the late 1990s is making it shrink. What used to be spruce trees and an insulating carpet of forest floor is now a layer of warm asphalt.

Human-assisted or not, thawing permafrost is a slow-motion disaster happening now in most of northern Alaska. Unlike a hurricane or a flood, the loss of permafrost is silent, rarely dramatic, and never fatal. In the back parking lot, university secretaries and grounds crew workers will steer into different parking spaces, and go on with their days.

Even though they are dramatic in scale, the northern changes John Walsh described have the same subtlety. They happen far from where most people live and have not yet resulted in an emergency for most of the world’s billions.

For example, sea ice was just not there in the Bering Sea and Arctic Ocean this spring.

“That was new territory for open water,” Walsh said.

In the recent history of Earth, blue water on the northern oceans in early spring was an event worthy of more than a few minutes of Twitter’s attention. But few people heard that ocean lapping outside Point Hope and Utqiagvik. Lack of reflective sea ice floating on the northern oceans might help nurture 30-inch rainfalls in Houston, Texas, but that connection is hard to prove.

There is also a confusing normalcy that interrupts the global warming narrative. Northern temperature trends that have climbed upward since the mid-1970s are indisputable, but have been skewed by what Walsh and other scientists call “internal variability.” A remembered example is January 2012, when the Fairbanks average daily temperature was -26.9 F, 19 degrees colder than the long-term average.

Cold months make people think things are the same as they always were, but “the dice are loaded toward the extremes that go with warming,” Walsh said. Those daily dramas include more rain in wintertime, less and thinner sea ice, shorter winters, and flash floods that wash out Alaska highways.

The ice that coated and broke spruce trees in my yard after a January 2018 rainfall is hard to pin on carbon levels in the atmosphere. But repeat enough unusual events and people may equate historic levels of carbon dioxide to weird, sometimes threating conditions.

“One of the ironies is that it takes a disaster to wake people up,” Walsh said, noting that climate researchers in Canada got a funding bump after a wildfire flashed through Fort McMurray in Alberta, Canada, in 2016.

At the end of his lecture, Walsh received a common, difficult question: We believe what you are saying, now what can we do about it?

The parking lot might be repaired if workers dug a swimming-pool sized hole to remove all the frozen soil and then replaced it with gravel. Similar repairs will probably cost northerners millions in the years to come.

And that’s just the Band-Aid. Reducing the carbon dioxide that is warming the planet takes a worldwide effort. Walsh believes it starts from the bottom-up, with people acting to reduce their own carbon emissions. He sees his job as spreading the word of what professionals are observing in the north and what it means for our future.

“I tend to look at creating awareness, using our science for a purpose,” he said.

Ned Rozell is a science writer for the University of Alaska Fairbanks‘ Geophysical Institute. Since the late 1970s, the Geophysical Institute has provided this column free in cooperation with the UAF research community. More of Ned’s columns can be found hereFollow Ned Rozell on Twitter at @NedRozell  and on Instagram at @neddyrozell