Warm Ocean Currents Cause Antarctica Ice Loss26/04/2012
|Reporting in the journal Nature, an international team of scientists led by British Antarctic Survey (BAS) has established that warm ocean currents are the dominant cause of recent ice loss from Antarctica. For the first time, new techniques have been able to differentiate between the two known causes of melting ice shelves: warm ocean currents attacking the underside, and warm air melting them from above. This finding brings scientists a step closer to providing reliable projections of future sea-level rise.|
Researchers used 4.5 million measurements made by a laser instrument mounted on NASA’s ICESat satellite to map the changing thickness of almost all the floating ice shelves around Antarctica, revealing the pattern of ice-shelf melt across the continent. Of the 54 ice shelves mapped, 20 are being melted by warm ocean currents, most of which are in West Antarctica.
Lead author Dr Hamish Pritchard from British Antarctic Survey, which is part of the UK’s Natural Environment Research Council (NERC), said to see a pattern that in all the cases where ice shelves are being melted by the ocean, the inland glaciers are speeding up. It’s this glacier acceleration that’s responsible for most of the increase in ice loss from the continent and this is contributing to sea-level rise. Some ice shelves are thinning by a few metres a year and, in response, the glaciers drain billions of tons of ice into the sea. This supports the idea that ice shelves are important in slowing down the glaciers that feed them, controlling the loss of ice from the Antarctic ice sheet.
He adds the researchers think that it’s linked to changes in wind patterns. Studies have shown that Antarctic winds have changed because of changes in climate and that this has affected the strength and direction of ocean currents. As a result warm water is funnelled beneath the floating ice. These studies and our new results therefore suggest that Antarctica’s glaciers are responding rapidly to a changing climate.
A different picture is seen on the eastern Antarctic Peninsula (the long stretch of land pointing towards South America). Here, the ice-shelf thinning found by this study can be explained by warm summer winds directly melting the snow on the ice-shelf surfaces. Both patterns, of widespread ocean-driven melting and this summer melting on the Antarctic Peninsula, can therefore be attributed to Antarctica’s changing wind patterns.
This research is part of international efforts to improve understanding of the interactions between ice and climate in order to improve the reliability of sea-level rise projections.
comments powered by Disqus
Read more about:
Supplier: British Antarctic Survey
More news from this supplier:
New Polar Research Ship for UK
Real-time Risk Index For Satellite Operators
Antarctic Geological Timeline Aids Future Sea-Level Predictions
Glacier Subject of Study Sea-level Rise
BAS Antarctic Survey Underway
Massive Subsea Volcanic Peaks and Craters
Special Tether Cable for Italian Institute of Geophysics and Volcanology
Kraken Sonar Receives Order From Defence Contractor
One Of Offshore Wind Industry's Largest Geotechnical Campaigns Completed
Ocean Currents Impact Methane Consumption
Fugro Sets Water Depth Record For Seafloor Drills
STR First to Invest in Sonardyne Syrinx DVL
RV Geo Resolution Christened in Singapore
South West Pacific Survey with Airborne Laser Bathymetry
Queen's Award for Applied Acoustics
Ocean Business 2015 Sees Visitor Numbers Increase by 29%
Teledyne BlueView 3D Scanning Sonar in Use for Inspections
Teledyne BlueView 3D scanning sonar is used in infrastructure inspection such as post scour remediation inspection. Infrastructure managers verify construction was completed to contract specifications and for pre-construction inspection to assist with project planning.