Sciencescience

Thu Sep 17, 2015, 12:54 PM

2015 sea ice minimum 4th lowest

According to a NASA analysis of satellite data, the 2015 Arctic sea ice minimum extent is the fourth lowest on record since observations from space began.

The analysis by NASA and the NASA-supported National Snow and Ice Data Center (NSIDC) at the University of Colorado at Boulder showed the annual minimum extent was 1.70 million square miles (4.41 million square kilometers) on Sept. 11. This year’s minimum is 699,000 square miles (1.81 million square kilometers) lower than the 1981-2010 average.


The 2015 Arctic sea ice summertime minimum is 699,000 square miles below the 1981-2010 average, shown here as a gold line. Credit: NASA/Goddard Scientific Visualization Studio
The 2015 Arctic sea ice summertime minimum is 699,000 square miles below the 1981-2010 average, shown here as a gold line. Credit: NASA/Goddard Scientific Visualization Studio
Arctic sea ice cover, made of frozen seawater that floats on top of the ocean, helps regulate the planet’s temperature by reflecting solar energy back to space. The sea ice cap grows and shrinks cyclically with the seasons. Its minimum summertime extent, which occurs at the end of the melt season, has been decreasing since the late 1970s in response to warming temperatures.

In some recent years, low sea-ice minimum extent has been at least in part exacerbated by meteorological factors, but that was not the case this year.

“This year is the fourth lowest, and yet we haven’t seen any major weather event or persistent weather pattern in the Arctic this summer that helped push the extent lower as often happens,” said Walt Meier, a sea ice scientist with NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “It was a bit warmer in some areas than last year, but it was cooler in other places, too.”

In contrast, the lowest year on record, 2012, saw a powerful August cyclone that fractured the ice cover, accelerating its decline.

The sea ice decline has accelerated since 1996. The 10 lowest minimum extents in the satellite record have occurred in the last 11 years. The 2014 minimum was 1.94 million square miles (5.03 million square kilometers), the seventh lowest on record. Although the 2015 minimum appears to have been reached, there is a chance that changing winds or late-season melt could reduce the Arctic extent even further in the next few days.
http://climate.nasa.gov/news/2341/

15 replies, 1615 views

Reply to this thread

Back to top Alert abuse

Always highlight: 10 newest replies | Replies posted after I mark a forum
Replies to this discussion thread
Arrow 15 replies Author Time Post
Reply 2015 sea ice minimum 4th lowest (Original post)
orson Sep 2015 OP
rahtruelies Sep 2015 #1
orson Sep 2015 #7
oldenuff35 Sep 2015 #2
orson Sep 2015 #8
Mr Happy Sep 2015 #3
EGTrise Sep 2015 #4
nolidad Sep 2015 #5
EGTrise Sep 2015 #6
Doctor_R Sep 2015 #9
Transcendence Sep 2015 #10
orson Sep 2015 #11
Jack Burton Sep 2015 #12
orson Sep 2015 #14
Transcendence Sep 2015 #15
Letmypeoplevote Sep 2015 #13

Response to orson (Original post)

Thu Sep 17, 2015, 01:09 PM

1. and so what?

Reply to this post

Back to top Alert abuse Link here Permalink


Response to rahtruelies (Reply #1)

Thu Sep 17, 2015, 09:26 PM

7. Well for one thing

you won't need your woolies.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to orson (Original post)

Thu Sep 17, 2015, 01:18 PM

2. You have a couple of decades of comparison.

how does it compare from 2000 BC to 2000 AD?

Your data is very incomplete as in 30/4000 which is less than one one thousandth of the time that mankind has lived in large villages on this earth.

Wow this information just has to be accurate...... BS on that

Reply to this post

Back to top Alert abuse Link here Permalink


Response to oldenuff35 (Reply #2)

Thu Sep 17, 2015, 09:29 PM

8. Those guys at NASA

must think they're rocket scientists, or something.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to orson (Original post)

Thu Sep 17, 2015, 01:43 PM

3. OMG!

Reply to this post

Back to top Alert abuse Link here Permalink


Response to orson (Original post)

Thu Sep 17, 2015, 02:49 PM

4. Yep. No surprises.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to EGTrise (Reply #4)

Thu Sep 17, 2015, 06:25 PM

5. And in the 1920's

the arctic sea ice was so low the northwest passage was fully passable!

Reply to this post

Back to top Alert abuse Link here Permalink



Response to orson (Original post)

Thu Sep 17, 2015, 10:47 PM

9. Didn't

algore say 2013 would be the end of the ice? Has anyone broke the news to him yet?

Reply to this post

Back to top Alert abuse Link here Permalink


Response to orson (Original post)

Fri Sep 18, 2015, 01:54 PM

10. That's around 30% larger than 2012

Quite a big jump in only 3 years.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to Transcendence (Reply #10)

Fri Sep 18, 2015, 03:12 PM

11. If you start counting from 2012

Arctic sea ice is rapidly increasing. Most climate change denial arguments seem to rely on some variation of that approach.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to orson (Reply #11)

Fri Sep 18, 2015, 03:17 PM

12. How can Arctic sea ice be increasing since 2012???

I'm told that increasing CO2 levels causes Arctic sea ice level to decrease. CO2 has increased since 2012.

Why did sea ice increase?

Reply to this post

Back to top Alert abuse Link here Permalink


Response to Jack Burton (Reply #12)

Fri Sep 18, 2015, 08:13 PM

14. Personally, I blame the weather

2012 was just a really bad year for ice, weather wise; a climatological anomaly. But it was a downside anomaly. The upside anomalies all relate to temperature.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to orson (Reply #11)

Mon Sep 21, 2015, 12:35 PM

15. And if you start counting from 1979

...you'll get a different answer based on different cherrypicking.

So what is your point? The bottom line is that we don't have enough data to know what 'normal' is.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to orson (Original post)

Fri Sep 18, 2015, 04:22 PM

13. The Arctic Sea Tumbles To A New Low

Reply to this post

Back to top Alert abuse Link here Permalink

Sciencescience