sail-world.com
 
 
News Home Cruising Photo Gallery Video Gallery

 

Sail-World.com : Arctic Sea Ice continues to decline, hits second-lowest level

Arctic Sea Ice continues to decline, hits second-lowest level

'NASA satellite data reveals how this year’s minimum sea ice extent, reached on Sept. 9 as depicted here, declined to a level far smaller than the 30-year average (in yellow) and opened up Northwest Passage shipping lanes (in red). (Credit: NASA Goddard’s Scientific Visualization Studio'    NASA/Goddard Space Flight Center Scientific Visual

Last month the extent of sea ice covering the Arctic Ocean declined to the second-lowest extent on record. Satellite data from NASA and the NASA-supported National Snow and Ice Data Center (NSIDC) at the University of Colorado in Boulder showed that the summertime sea ice cover narrowly avoided a new record low.

The Arctic ice cap grows each winter as the sun sets for several months and shrinks each summer as the sun rises higher in the northern sky. Each year the Arctic sea ice reaches its annual minimum extent in September. It hit a record low in 2007.

The near-record ice-melt followed higher-than-average summer temperatures, but without the unusual weather conditions that contributed to the extreme melt of 2007. 'Atmospheric and oceanic conditions were not as conducive to ice loss this year, but the melt still neared 2007 levels,' said NSIDC scientist Walt Meier. 'This probably reflects loss of multiyear ice in the Beaufort and Chukchi seas as well as other factors that are making the ice more vulnerable.'

Joey Comiso, senior scientist at NASA's Goddard Space Flight Center in Greenbelt, Md., said the continued low minimum sea ice levels fits into the large-scale decline pattern that scientists have watched unfold over the past three decades.

'The sea ice is not only declining, the pace of the decline is becoming more drastic,' Comiso said. 'The older, thicker ice is declining faster than the rest, making for a more vulnerable perennial ice cover.'

While the sea ice extent did not dip below the 2007 record, the sea ice area as measured by the microwave radiometer on NASA's Aqua satellite did drop slightly lower than 2007 levels for about 10 days in early September, Comiso said. Sea ice 'area' differs from extent in that it equals the actual surface area covered by ice, while extent includes any area where ice covers at least 15 percent of the ocean.

Arctic sea ice extent on Sept. 9, the lowest point this year, was 4.33 million square kilometers (1.67 million square miles). Averaged over the month of September, ice extent was 4.61 million square kilometers (1.78 million square miles). This places 2011 as the second lowest ice extent both for the daily minimum extent and the monthly average. Ice extent was 2.43 million square kilometers (938,000 square miles) below the 1979 to 2000 average.

This summer's low ice extent continued the downward trend seen over the last 30 years, which scientists attribute largely to warming temperatures caused by climate change. Data show that Arctic sea ice has been declining both in extent and thickness. Since 1979, September Arctic sea ice extent has declined by 12 percent per decade.

'The oldest and thickest ice in the Arctic continues to decline, especially in the Beaufort Sea and the Canada Basin,' NSIDC scientist Julienne Stroeve said. 'This appears to be an important driver for the low sea ice conditions over the past few summers.'

Climate models have suggested that the Arctic could lose almost all of its summer ice cover by 2100, but in recent years, ice extent has declined faster than the models predicted.

NASA monitors and studies changing sea ice conditions in both the Arctic and Antarctic with a variety of spaceborne and airborne research capabilities. This month NASA resumes Operation IceBridge, a multi-year series of flights over sea ice and ice sheets at both poles. This fall's campaign will be based out of Punta Arenas, Chile, and make flights over Antarctica . NASA also continues work toward launching ICESat-2 in 2016, which will continue its predecessor's crucial laser altimetry observations of ice cover from space.

To see a NASA data visualization of the 2011 Arctic sea ice minimum as measured by the Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) on Aqua,
click here

For more information about NASA and agency programs, visit http://www.nasa.gov




by NASA

  

Click on the FB Like link to post this story to your FB wall

http://www.sail-world.com/index.cfm?nid=89291

7:25 AM Wed 5 Oct 2011 GMT






Click here for printer friendly version
Click here to send us feedback or comments about this story.


News - USA and the World



































ISAF Sailing World Championships - Watch medal races live here by Dan Ibsen, Sail-World Europe & UK editor,








470 Men and Women Worlds - Vadlau and Ogar into pole position by 470 International Association Class,




ISAF Sailing Worlds, Santander - Strong competition for RS:X fleets by Olga Maslivets, International RS:X Class Assoc.,




















Volvo Ocean Race: Win a stopover trip by designing an ECsix T-Shirt
Red Bull 49erFX: On the eve of the Worlds in Santander
America's Cup: Ben Ainslie Racing launches partnership with Yamaha
2014 Chicago Match Cup - Starts tomorrow
Rio 2016 Daylight the issue for Olympic sailing regatta
ISAF Sailing World Championships - USA 470's and Lasers battle at top
ISAF Sailing World Championships - Santander - Day 5 video highlights
ISAF Sailing World Championships - Santander images by Jesús Renedo
PWA Cold Hawaii World Cup - No action on day 2
470 Men and Women Worlds - Game on for Olympic Qualification
ISAF Sailing World Championships: Finns off to slow start in Santander
ISAF Sailing World Championships - Seesaw Day 5 in Santander + Video
ISAF Sailing World Championships - 470 sailors shine in Santander
Royal Cup Marina Ibiza - Kiwi Ray Davies returns to TP52 fleet
Starboard Hatteras Wave Jam - No windsurfing action on day 1
A complete recap of the most successful Melges 20 World Championship
Rolex Big Boat Series - Prizegiving images by Chuck Lantz
ISAF Santander - Upwards path for Austrian women's 470 crew + video
18ft skiffs: Carnage compilation from the glory days of the Grand Prix
ISAF Worlds: Video from the British Sailing Team
Bart's Bash expected to set new records this weekend   
PWA Cold Hawaii World Cup - Marcilio Browne wins Super Session   
470 Men and Women World Championships - Racing abandoned on day 2   
ISAF Sailing World Championships - Day 4 images from Santander   
ISAF Sailing Worlds, Santander: Emerging Nations Program sailors shine   
ISAF Sailing Worlds, Santander - Teasing winds play havoc on day 4   
ISAF Sailing World Championships: Hot conditions in Santander on day 4   
Santander ISAF Sailing World Championships joins Bart’s Bash   
PWA Cold Hawaii World Cup - Grounded fishing boat creates problems   
Marseille One Design - GC32 Armin Strom Sailing Team emerge victorious   
Rolex Big Boat Series 2014 - Ready for another 50 years   
2014 Rolex Big Boat Series - Farr 40 Day 4   
2014 Rolex Swan Cup - Eleventh-hour victories   
Extreme Sailing Series - Kiwis clinch Act win in Istanbul + Video   
2014 Rolex Big Boat Series - Two long races today for the J70 fleet   
2014 Rolex Big Boat Series - Impressive to sail out of the Golden Gate   
Extreme Sailing Series - Istanbul delivers four days of great racing   
ISAF Sailing Worlds Santander - Day 3 images by Sail-World.com   
Extreme Sailing Series: Emirates Team NZ bounces back for series win   
Santander 2014 ISAF Worlds - Light winds and current test six classes   


For this week's complete news stories select    Last 7 Days
   Search All News
For last month's complete news stories select    Last 30 Days
   Archive News







Sail-World.com  


















Switch Default Region to:

Social Media

Asia

Australia

Canada

Europe

New Zealand

United Kingdom


http://www.sail-world.com/event_images/image/Twitter_logo_small.png http://www.sail-world.com/event_images/image/FaceBook-icon.png  http://www.sail-world.com/event_images/image/RSS-Icon.png

United States

Cruising Northern

Cruising Southern

MarineBusiness World

PowerBoat World

FishingBoating World

 

Contact

Commercial

News

Search

Contact Us

Advertisers Information

Submit news/events

Search Stories/Text

Feedback

Advertisers Directory

Newsletter Archive

Photo Gallery

 

Banner Advertising Details

Newsletter Subscribe

Video Gallery

Policies

 

 

 

Privacy Policy

 

 


Cookie Policy

 

 



This site and its contents are © Copyright TetraMedia and/or the original author, photographer etc. All Rights Reserved.  Photographs are copyright by law.  If you wish to use or buy a photograph contact the photographer directly.
XLXL NEW US
LocalAds   DE  ES  FR  IT