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Arctic Sea Ice Record Now Could Be Set in August

Arctic sea ice cover is likely to reach a new record low as soon as next week, several weeks before the end of the melt season, according to data from the National Snow and Ice Data Center (NSIDC) and news reports. In fact, by at least one measure — sea ice area — the ice cover has already set a record low.

The rapid decline in Arctic sea ice during the past several decades is one of the most visible signs of manmade global warming. The Arctic is warming at nearly twice the rate of the rest of the globe, largely due to feedback loops that are unique to the climate of the Far North. What happens in the Arctic doesn’t stay in the Arctic, though. Recent research shows that the loss of sea ice cover may be contributing to extreme weather events throughout the Northern Hemisphere, and may be partly responsible for major cold air outbreaks and paralyzing snowstorms in the northeastern U.S. and western Europe during the past few years.

Arctic sea ice extent during the 2012 melt season, compared to recent melt seasons and the long-term average. Click on the image for a larger version.
Credit: NSIDC.

According to the NSIDC, Arctic sea ice extent is currently tracking well below the level seen at this time during the record melt season of 2007, and is on track to set a record low as soon as next week, if recent trends continue. If this occurs, this would be well before the end of the melt season, which typically closes out in mid-September.

What’s particularly unusual is that instead of slowing down in August, which typically happens as summer begins to wane in the Far North, the rate of sea ice decline actually accelerated. This may be related to an unusually powerful summer storm that swept across the Arctic Ocean in early August, which may have helped break up thin sea ice cover, although its exact impacts are not yet fully known.

“I don't think the big storm that we have earlier this month had much of an effect,” said Mark Serreze, the NSIDC director. “The rapid loss of ice we've seen over the past few weeks has been in the East Siberian Sea (north of Eastern Siberia) and this ice was already posed to melt out, with or without a storm.”

Instead of the storm, Serreze pointed to the long-term thinning of the sea ice cover as the most likely culprit for this year’s precipitous decline in sea ice cover, since thinner sea ice is far more susceptible to melting during the summer months.

Arctic sea ice area, showing the 2012 record low. Click on the image for a larger version.
Credit: Cryosphere Today.

“While we still get plenty of ice growth during autumn and winter, the ice cover that we have in spring is thinner than it used to be," Serreze said. "It has gotten so thin now that large areas completely melt out in summer. We no longer need a "boost" from weather patterns favoring summer ice melt like we saw in 2007.” 

The conditions that led to the 2007 record melt, including unusually warm air temperatures and sunnier than normal weather, plus winds and ocean currents that flushed sea ice out of the Arctic and into the North Atlantic, have been largely absent during this melt season.

According to a Reuters interview with Ted Scambos, an NSIDC researcher, sea ice extent could retreat to below 1.5 million square miles by the end of the 2012 melt season, which has never happened before in the observational record.

"What you're seeing is more open ocean than you're seeing ice," Scambos told Reuters. "It just simply doesn't look like what a polar scientist expects the Arctic to look like. It's wide open and the (ice) cap is very small. It's a visceral thing. You look at it and that just doesn't look like the Arctic Ocean any more."

As Climate Central's Mike Lemonick reported last week on Arctic sea ice on pace for a record low, this new data confirms what scientists have been seeing for several years: the ice is thinning a lot faster than climate models originally predicted, which in the end, could accelerate the warming of the entire planet. Open water will warm the ocean itself, which could undermine the glaciers on nearby Greenland. The generally warmer conditions could also speed the melting of permafrost on land in Alaska, Canada and Russia. That could release extra heat-trapping carbon dioxide into the atmosphere, which would further turbo charge global warming. So could the release of methane as plant material decays in soggy marshes, or escapes from hydrate deposits on the sea floor.

One additional metric of sea ice also shows the effects of this extreme melt season. Sea ice area, which tends to be a smaller figure than sea ice extent, has already reached a record low of about 2.84 million square kilometers, compared to the 2011 record low of 2.90 million square kilometers.

The NSIDC describes the difference between sea ice extent and area in the following way:  "A simplified way to think of extent vs. area is to imagine a slice of swiss cheese. Extent would be a measure of the edges of the slice of cheese and all of the space inside it. Area would be the measure of where there is cheese only, not including the holes. That is why if you compare extent and area in the same time period, extent is always bigger." NSIDC scientists maintain that sea ice extent is a more accurate metric because of the way satellites measure sea ice that is in the process of melting.

Still another way to gauge the state of the sea ice, one which Serreze said provides crucial information about sea ice health, is through measurements that take into account sea ice thickness. Right now, sea ice volume data is also running below record levels for this time of year, but it has not yet reached an all-time low. 

The absence of sea ice has boosted interest in Arctic shipping and oil and gas resource exploration. For example, a Chinese icebreaker recently became the first Chinese ship to cross the Arctic Ocean via the Northern Sea Route which runs along the northern shores of Russia. The decline of sea ice cover may open up lucrative seasonal shipping routes.

Comments

By Robert E. Wozna (Holland Patent, NY 13354S)
on August 22nd, 2012

Arctic sea ice AGAIN possibly being set?? What’s new? Climatoligists have been warning all of us about fossil fuel use for at least 25 years but fossil fuel companies and other debunkers have muddied the data and confused many of us about who is actually right. Maybe this years “Global Weirdness” (as you call your recent publication) regarding world-wide weather problems will convince more people to get serious about doing something about the dangers heading for our children and grand-children.
Also, I am reading your book “Global Weirdness” and it’s very easy to read. Anyone one who quickly wants to know about climate change and all its problems should buy it-very easy reading.

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By Malte H.
on August 22nd, 2012

Excellent post. Lets see when JAXA and NSIDC extent record record lows. JAXA is at 4.4 million km2 just 150,000km2 above 2007 record low. If rate of decline holds new JAXA record by Friday or Saturday.

Reply to this comment

By Byron Smith (Edinburgh)
on August 22nd, 2012

Thanks - great post.

Though throwing in an extent in square miles mid-stream when every single measurement I’ve ever seen from every organisation tracking this is in square kilometres really threw me for a second (since I’m familiar with 4 million sq km being relative tiny for sea ice, so seeing 1.5 million blew me away, until I checked units).

I realise this is the figure that is quoted in the interview, but I feel a conversion would have been useful.

OK, very minor gripe over. Thanks again!

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By Aaron Smith (atlanta)
on August 23rd, 2012

Everyone ie missing the obvious here: ICE BREAKERS.

How many trips to the north pole are made each year in an ice breaker?  How many ships are breaking through the Arctic ice on their shipping routes?  Ice melts much faster when broken up…..and we are talking about an area that was relatively untouched throughout eons of the earth’s history until the late 1930s.

Antarctica is setting a record foe the MOST sea ice right now as we speak.  The problem is the breaking up or the ice by these ships which, in turn, cause the ice to melt faster in Tue summer….leading to long long days of sun exposure to the ocean itself instead of ice. 

Now, you have an exposed ocean that was once covered in ice…..RELEASING possibly more CO2 into the atmosphere as it warms up than all the co2 released from all the emissions from the entire industrial era.

Why don’t you book a cruise to the north pole for 20,000$?  I’m sure they will gladly take you.

No one in 1930 could have ever imagined….. And now, as our magnetic north pole shifts rapidly because of the compensation of the iron core shifting beneath….. Will it be enough to induce a magnetic pole reversal?

I say no.  The south magnetic pole is stable….but it would be interesting to live through w reversal.

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