sail-world.com
 
 
News Home Cruising Australia Cruising USA Cruising Canada Boats for Sale Sail-World Racing Photo Gallery FishingBoating
Photo Gallery FishingBoating Video Gallery Newsletters
Sail-World.com : New methodology measures ominous Antarctic glacier melt
New methodology measures ominous Antarctic glacier melt


'Satellite image of a gigantic iceberg broken from Pine Island Glacier'    .

Do some South Pacific, Caribbean and Indian Ocean Islands really have to be worried about their future? Will your favourite natural island be gone below the oceans in a few years? This is much discussed by cruising sailors in cockpit sundowners, sometimes with hot divisions. According to a new paper in the British Antarctic Survey website, it is not a matter of if, but when, and scientists have been having a hard time working this out.

Recently, an iceberg the size of Singapore broke from the Pine Island Glacier and, last reported on, was heading north - not a good thing for a Southern Ocean sailor to meet.

By thinning and speeding up, West Antarctic ice streams contribute to about 10% of the observed global sea-level rise. A significant amount of this ice loss is from Pine Island Glacier, which has thinned over past decades, driven by changes in ocean heat transport beneath its ice shelf and retreat of the grounding line.

Details of the processes driving this change, however, remain largely elusive, hampering our ability to predict the future behaviour of this and similar systems.

In a new paper, a novel methodology is developed to measure oceanic melting of such rapidly advecting ice. High-resolution satellite and airborne observations of ice surface velocity and elevation are used to quantify patterns of basal melt under the Pine Island Glacier ice shelf and the associated adjustments to ice flow.

At the broad scale, melt rates of up to 100m/yr occur near the grounding line, reducing to 30m/yr just 20km downstream.

At smaller scales, a network of basal channels typically 500m to 3km wide is sculpted by concentrated melt, with kilometre-scale anomalies reaching 50% of the broad-scale basal melt.

Pine Island Glacier -  .. .  

Basal melting enlarges the channels close to the grounding line, but farther downstream melting tends to diminish them.

Kilometre-scale variations in melt are a key component of the complex ice-ocean interaction beneath the ice shelf, implying that greater understanding of their effect, or very-high-resolution models, are required to predict the sea-level contribution of the region.

One step at a time, our ocean scientists are gaining new insights.

Click here for the full paper in the NERC Open Research Archive.

British Antarctic Survey website


by British Antarctic Survey

  

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

http://www.sail-world.com/index.cfm?nid=118318

9:08 PM Sat 11 Jan 2014GMT


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







Sail-World Cruising News - local and the World





Remember to properly dispose of obsolete distress beacons by Australian Maritime Safety Authority,




World ARC fleet bids farewell to Bali by World Cruising Club,














World ARC crews in Bali by World Cruising Club,


Could your sailing navigation use a tune-up? by Captain John Jamieson, Florida












The Boat Cookbook by BoatBooks,










World ARC fleet now arriving in Bali by World Cruising Club,
















Pack this sailing gear for 'hands-free' lighting by Captain John Jamieson, Florida




Europe tightens up on skippers competency certification
World ARC fleet departs Darwin under full sail
NOAA expedition discovers ship’s timepiece silent for nearly 200 years
Blue Planet Odyssey - Northwest Passage gate opens
A Cruising Guide to the Dominican Republic 6.0 now available
BNS Leopold I to commence counter-piracy operations
Africa Europe Challenge introduces 'Spectator's Package'
Wanted youth circumnavigators on a 'Voyage of Imagination'
Niagara-on-the-Lake, a popular cruising destination in Canada
The crowd-pleasing comforts of catamaran cruising
Death by Dinghy
'Sailing Stones' of Death Valley seen in action for the first time
Coast Guard searching for two boaters near St. Petersburg
20 coral species listed as threatened under the Endangered Species Act
Shanghai to San Francisco in under 2 hours via supersonic sub
PSP Southampton Boat Show 2014 - 2 for £24 ticket offer ends soon
A case of crossed wires? A shocking situation!
How amazingly awe-inspiring the Arctic really is
New atlas provides thorough audit of marine life in the Southern Ocean
European Odyssey boats arrive in Lanzarote + Video
Multiagency rescue at Dunraven Bay + Video   
Canal Boating in the Alsace with the Galley Guys   
World ARC fleet arrives in Darwin   
Dangers of the Dinghy trip back to your boat   
European Odyssey visits Porto   
Timeless Tonga - Charter sailing in a Polynesian paradise *Feature   
A fine conclusion to the ARC Baltic 2014   
Where in the world are our strongest corals?   
Baltic 4 Nations fleet arrive into Stralsund City Marina   
Huff of Arklow nearing completion, expected on the water next month   
Incredible efforts to save yacht from being lost at sea   
ARC Baltic fleet visit six countries and six capitals in six weeks   
Helen Island, Palau -a beautiful and unique place   
Bart's Bash: Over 2300 entered from 588 yacht clubs - Join here   
Barnacle Busting   
From Penguins to Polar Bears   
Cornell turns back from the North West Passage   
A cruising guide to the ABC Islands - Spanish Edition   
Missing German tourists in the hands of Abu Sayyaf Group   
NCI granted dedicated VHF Channel   


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 CRU NH
LocalAds   DE  ES  FR  IT