Arctic sea ice will be below average again this year

Bad Astronomy
The entire universe in blog form
Aug. 30 2011 6:30 AM

Arctic sea ice will be below average again this year

Geez, I hate to keep hitting this theme, but y'know what? It's important.

Using a fleet of Earth-observing satellites, the European Space Agency is reporting that the ice in the Arctic circle is already retreating considerably, and will once again be below average in extent this summer. This has been going on for a few years now, which isn't terribly surprising considering that global warming is real and that we keep seeing recent years tied or exceeding records as hottest years on record.

Phil Plait Phil Plait

Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death From the Skies!  

Advertisement

Here's the map they made showing sea ice extent from June 1 to August 24, 2011:

Yikes. Back in 2007, the Northwest Passage became entirely navigable by sea (without using an icebreaker ship) for the first time in recorded history. It had already been thinning for years, but an icebreaker ship was still needed to get through all of it -- that's changed now.

Moreover, it's not just that the extent -- that is, the amount of area covered by the ice -- has dropped, it's also that it's thinning, dropping in volume. The ice volume has decreased by unprecedented amounts as well recently.

What does this mean for the current Arctic summer?

"The minimum ice extent is still three to four weeks away, and a lot depends on the weather conditions over the Arctic during those weeks," says Leif Toudal Pedersen, a senior scientist at the Danish Meteorological Institute. "Whether we reach an absolute minimum or not, this year again confirms that we are in a new regime with substantially less summer ice than before. The last five summers are the five minimum ice extent summers on record."

[Emphasis mine.]

Just to be clear: it's OK to question the science of global warming. It's OK to question any scientific findings, as long as that questioning is done with good intentions and in good faith (so to speak). While poking around the web I found denier sites trying to confuse the issue of sea ice extent -- for example, some talking about the navigability of the Northwest Passage as far back as 2000, but not mentioning you needed an icebreaker to do it.

As usual, the evidence here is pretty clear: temperatures are increasing, sea ice is going away, glaciers are retreating, ocean levels are rising, and all the while we're dumping greenhouse gases into the atmosphere while the spin doctors whirl away.

It's maddening. But it will continue, as surely as the Earth itself turns.



Related posts:


TODAY IN SLATE

Politics

The Irritating Confidante

John Dickerson on Ben Bradlee’s fascinating relationship with John F. Kennedy.

My Father Invented Social Networking at a Girls’ Reform School in the 1930s

Renée Zellweger’s New Face Is Too Real

Sleater-Kinney Was Once America’s Best Rock Band

Can it be again?

The All The President’s Men Scene That Captured Ben Bradlee

Medical Examiner

Is It Better to Be a Hero Like Batman?

Or an altruist like Bruce Wayne?

Technology

Driving in Circles

The autonomous Google car may never actually happen.

The World’s Human Rights Violators Are Signatories to the World’s Human Rights Treaties

How Punctual Are Germans?

  News & Politics
Politics
Oct. 22 2014 12:44 AM We Need More Ben Bradlees His relationship with John F. Kennedy shows what’s missing from today’s Washington journalism.
  Business
Moneybox
Oct. 21 2014 5:57 PM Soda and Fries Have Lost Their Charm for Both Consumers and Investors
  Life
Outward
Oct. 22 2014 9:00 AM Wailing Against the Pansies: Homophobia in Whiplash
  Double X
The XX Factor
Oct. 21 2014 3:03 PM Renée Zellweger’s New Face Is Too Real
  Slate Plus
Working
Oct. 22 2014 6:00 AM Why It’s OK to Ask People What They Do David Plotz talks to two junior staffers about the lessons of Working.
  Arts
Brow Beat
Oct. 22 2014 9:19 AM Nine Actors Remember Their Famous Horror-Movie Deaths
  Technology
Future Tense
Oct. 22 2014 8:43 AM Thunderstruck: Rock Out With Mother Nature’s Evil Side
  Health & Science
Bad Astronomy
Oct. 22 2014 7:30 AM An Illusion That Makes Me Happy and Sad
  Sports
Sports Nut
Oct. 20 2014 5:09 PM Keepaway, on Three. Ready—Break! On his record-breaking touchdown pass, Peyton Manning couldn’t even leave the celebration to chance.