Arctic Sea Ice Melting Slows Despite Hotter Atmosphere

Dire warnings that Arctic sea ice would be a thing of
the past by several years ago hasn't happened. A 
new study explains why those warnings were
false alarms - but only for now. 

This sounds like great news:

Despite the increasing pressure of climate change, Arctic sea ice decline has slowed quite a bit. 

The slowdown has been noticeable in all months of the year.  The month of September has seen no statistically significant decline in sea ice over the past two decades. 

The melt rate per the past 20 years has been at least twice as slow as the longer term rate. 

But when it comes to climate change, there's never good news.  This slower melt won't last forever. More on that in a bit. 

Arctic sea ice is important because what goes on at the North Pole doesn't stay at the North Pole. If the ice went away entirely during summers,   the pace of Earth's warming could increase. White ice reflects away the sun's heat. Blue ocean water absorbs it. 

The Arctic is already warming faster than the rest of the planet and if the ice goes, the heating up there would really ramp up. 

An ice-free Arctic would accelerate climate change and throw things even more off balance than they already are. That, in turn could lead to even bigger climate extremes than we're seeing now.

Even if all that climate bad stuff doesn't happen, an ice-free Arctic would invite even more ships, resource mining,  geopolitical conflict, population and everything else that would dangerously pollute what has been a rather pristine environment.

THE STUDY

This slow Arctic melt all comes from research recently published in Geophysical Research Letters. 

Per the study's abstract:

"Most of the evidence from these climate models suggests that natural climate variations have played a large part in slowing the human-driven loss of sea ice. However, it is not entirely certain whether changes in the human influence on climate (the "forced response") have also contributed.

Overall, while it may sound surprising that Arctic sea ice loss has slowed down even as global temperatures hit record highs, the climate modeling evidence suggests we should expect periods like this to occur somewhat frequently."

The researchers ran climate models which show natural cycles can create these pauses in Arctic melting.

"Even though there is increased emissions (and) increased global temperatures, you can still get periods where you have very minimal loss of Arctic sea ice for sustained periods," said Mark England, lead author of the study. 

Energy always transfers back and forth between oceans and the atmosphere, with the oceans able to store much more energy than the air. 

There's natural cycles in which the oceans take in a little more energy than normal, which makes the atmosphere a tad cooler. Those cycles also sometimes allow the atmosphere to keep a slightly greater share of energy, so the climate warms up. 

The study concluded that natural cycles kept waters around the Arctic a little cooler, so the rate of ice loss has slowed. 

Mark England,  lead author of the study, said that without climate change, sea ice might well have expanded during the cycle we're in now.  

The study helps explain why dire predictions of an imminent summer time ice-free Arctic never came to pass. 

Sea ice in the Arctic hit record minimums in 2007 and 2012, leading to speculation the Arctic could have its first ice-free summer by 2020.  In hindsight, the researchers wrote, that idea was overly alarmist. 

MELT TO RESUME?

All good things must come to an end, though, and so will this cycle that's been preserving the Arctic sea ice. 

The current melting slowdown could last another five to 10 years, according to the climate models and the study. When that happens (It's a when, not an if) the ice loss would accelerate and at that point we might actually see the demise of Arctic sea ice during summers. 

In the short term, the ice up there is clearly in short supply up in the Arctic, despite the slowdown in melting. 

In its recent July climate report, the National Centers for Environmental Information said Arctic sea ice was the fourth smallest on record for July, at 420,000 square miles below average.  

Another melt zone scientist watch closely is Greenland. That ice will never entirely go away, at least not for hundreds, more likely thousands of years, if ever

Greenland matters even more than the Arctic because whatever melts off of Greenland becomes sea level rise.   If the ice on the Arctic ocean melts, it doesn't really raise se levels. It's like the ice in your gin and tonic melting. 

Greenland is probably subject to cyclical weather and climate patterns too, but the research we're talking about in this post didn't address that. 

This year, the Greenland melt has been above normal once again, but it's not setting records. There was a lot of melting between July 7 and 20, which tipped the scales to above the 1981 -2019 average for total melt extent, say the National Snow and Ice Data Center. But overall, the number of days with melting lagged behind some of the warmer summers in the recent past. 

There has been a last minute spike in Greenland ice melting in the past few days, but once that tapers off, that'll be mostly it for 2025.   By early September, the Greenland melt season is pretty much over.