Powerboat-World.com
 
 
News Home Video Gallery Newsletters Features Photo Gallery
Sail-World.com : New insight into accelerating summer Antarctic Peninsula ice melt
New insight into accelerating summer Antarctic Peninsula ice melt


'Ice core camp'    British Antarctic Survey ©

The latest 1000-year Antarctic Peninsula climate reconstruction confirms that summer ice melt has intensified almost ten-fold, and mostly since the mid-20th Century. Summer ice melt affects the stability of Antarctic ice shelves and glaciers.

The research, published this week in the journal Nature Geoscience, adds new knowledge to the international effort that is required to understand the causes of environmental change in Antarctica and to make more accurate projections about the direct and indirect contribution of Antarctica’s ice shelves and glaciers to global sea level rise.

In 2008 a UK-French science team drilled a 364-metre long ice core from James Ross Island, near the northern tip of the Antarctic Peninsula, to measure past temperatures in the area. They discovered that this ice core could also give a unique and unexpected insight into ice melt in the region.

Visible layers in the ice core indicated periods when summer snow on the ice cap thawed and then refroze. By measuring the thickness of these melt layers the scientists were able to examine how the history of melting compared with changes in temperature at the ice core site over the last 1000-years.

Lead author Dr Nerilie Abram of The Australian National University and British Antarctic Survey (BAS) says, 'We found that the coolest conditions on the Antarctic Peninsula and the lowest amount of summer melt occurred around 600 years ago. At that time temperatures were around 1.6°C lower than those recorded in the late 20th Century and the amount of annual snowfall that melted and refroze was about 0.5%. Today, we see almost ten times as much (5%) of the annual snowfall melting each year.

'Summer melting at the ice core site today is now at a level that is higher than at any other time over the last 1000 years. And whilst temperatures at this site increased gradually in phases over many hundreds of years, most of the intensification of melting has happened since the mid-20th century.'

This is the first time it has been demonstrated that levels of ice melt on the Antarctic Peninsula have been particularly sensitive to increasing temperature during the 20th Century.

Dr Abram explains, 'What that means is that the Antarctic Peninsula has warmed to a level where even small increases in temperature can now lead to a big increase in summer ice melt.'

Dr Robert Mulvaney from the British Antarctic Survey led the ice core drilling expedition and co-authored the paper. He says, 'Having a record of previous melt intensity for the Peninsula is particularly important because of the glacier retreat and ice shelf loss we are now seeing in the area. Summer ice melt is a key process that is thought to have weakened ice shelves along the Antarctic Peninsula leading to a succession of dramatic collapses, as well as speeding up glacier ice loss across the region over the last 50 years.'

In other parts of Antarctica, such as the West Antarctic Ice Sheet, the picture is more complex and it is not yet clear that the levels of recent ice melt and glacier loss are exceptional or caused by human-driven climate changes.

Dr Abram concludes, 'This new ice core record shows that even small changes in temperature can result in large increases in the amount of melting in places where summer temperatures are near to 0°C, such as along the Antarctic Peninsula, and this has important implications for ice instability and sea level rise in a warming climate.'

This research was funded by the Natural Environment Research Council. Dr Abram is an Australian Research Council Queen Elizabeth II Fellow.

British Antarctic Survey website


by British Antarctic Survey/Australian National Univ

  

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

http://www.powerboat-world.com/index.cfm?nid=108431

6:35 PM Sun 14 Apr 2013GMT


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







Power Boat News - USA





2014 warmest year since records began + Video by NOAA National Climatic Data Center,


































Garmin introduces new scanning sonar black box by Garmin International Inc.,






Statewide operation to focus on random breath testing of boaters by Transport Roads and Maritime Services,












NMMA loses E15 fuel U.S. Court of Appeals Decision by National Marine Manufacturers Association,










Super Boat International keeps 4th of July tradition alive
United States Powerboat Show transforms Annapolis City Dock
King of Offshore - The Untold Story of Reggie Fountain + Video
F1H2O Worlds 2014 - Qatar Team heads to Florida for more F1 testing
CUBAR Odyssey to host informational kick off dinner
Update: Stunning finds from ancient Greek Shipwreck
Teams preparing for Key West 2015 season
Marine Researchers and Educators benefit from Tortuga Music Festival
Coast Guard Foundation to honor Coast Guard heroics and excellence
Magnum Marine new 51 edition at Flibs 2014
Super Boat National Championships - Great conditions for sixth edition
US Coast Guard to drop the current life jacket type code scheme
Mercury Marine produces 75,000th Verado L6 outboard engine
$10,000 available for the best safe, clean boating outreach projects
Formula Two PROP Series Champs - Tammy Wolf racing second in series
British ocean adventuring legend launches round the world record bid
Powerboat P1 plans to take SuperStock and AquaX racing to Singapore
Insurance, towing and safety 'provisions' reminder for snowbirds
You scratched my seagrass!
RYA Advanced Powerboat Handbook unveiled at PSP Southampton Boat Show
Mediterranean Grand Prix - Pons and Chris win the titles   
Mediterranean Grand Prix 2014 - Wins for Victory and Chaudron   
What can you do to prevent electrocution and ESD?   
Mediterranean Grand Prix - Powerboat racing heavyweights head to Ibiza   
Mediterranean Grand Prix - World Aquabike stars all set   
Antarctic sea-level rising faster than global rate   
Fort Lauderdale International Boat Show - 13 things to See and do   
Blowsion Surf Slam to take place at Tierra Del Mar   
P1 USA AquaX race series action heats up   
Super Boat International double header a huge Success   
Helping boaters understand weather basics   
Polar research: Six priorities for Antarctic science   
Bivalves' ability to clean chemicals from waterways   
Coast Guard Foundation hosts Alaska Awards Dinner   
77 Lucas Oil SilverHook leads Superboat Unlimited class   
Sustainable Seafood - How to purchase with confidence   
John Wilson has sights set on second P1 SuperStock title   
Torquay Grand Prix - Pertemps tops table on penultimate day   
Coast Guard Foundation to honor Coast Guard in Alaska   
Great Lakes Grand Prix - Team Broadco wins Superboat Class   


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/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 PBW US
LocalAds   DE  ES  FR  IT