Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Greenland's current loss of ice mass

30.05.2012
Loss through melting and iceberg calving during the last 10 years is unusually high compared to the last 50 years

The Greenland ice sheet continues to lose mass and thus contributes at about 0.7 millimeters per year to the currently observed sea level change of about 3 mm per year. This trend increases each year by a further 0.07 millimeters per year. The pattern and temporal nature of loss is complex.

The mass loss is largest in southwest and northwest Greenland; the respective contributions of melting, iceberg calving and fluctuations in snow accumulation differing considerably. This result has been published by an international research group led by the GFZ German Research Centre for Geosciences in the latest issue of Earth and Planetary Science Letters, 1 June 2012.

The result was made possible by a new comparison of three different types of satellite observations: measurements of the change in gravity by changes in ice mass with the satellite pair GRACE, height variation with the laser altimeter on the NASA satellite ICESat and determination of the difference between the accumulation of regional atmospheric models and the glacier discharge, as measured by satellite radar data.

For the first time and for each region, the researchers could determine with unprecedented precision which percentage melting, iceberg calving and fluctuations in rainfall have on the current mass loss. "Such an increase in mass loss in the northwest after 2005 is partly due to heavy snowfall in the years before", says GFZ scientist Ingo Sasgen, head of the study. "The previous mass gain was reduced in subsequent years. Similarly in eastern Greenland: In the years 2008 and 2009 there was even a mass increase". As the researchers were able to show, this was not due to decreased glacier velocities, but because of two winters with very heavy snowfall. Meanwhile, the loss of ice mass continues here. For all studied regions the melting and calving periods between 2002 and 2011 are extraordinarily high compared to those of the last five decades.

The work was created in the framework of the Helmholtz Climate Initiative REKLIMof the Helmholtz Association and the EU project ice2sea. Due to the study, the researchers can get a little closer to understanding the current developments of the Greenland ice sheet. Ingo Sasgen: "We now know very well how calving glaciers and melting contribute to the current mass balance, and when regional trends are largely caused by rainfall variations. And we also know where our measurements must be improved." One such area is north-western Greenland, where the comparison of data indicates an abrupt increase in the calving rate, which was detected by the radar data inadequately. The REKLIM/ice2sea scientists want to find out what causes this increase and if it has a continuous or episodic character. A necessary prerequisite is a sufficiently long time series of measurements that is to be created by the continued precise gravity measurements in the context of the new satellite mission GRACE-FO (Gravity Recovery And Climate Experiment – Follow On).

Ingo Sasgen et al., „Timing and Origin of Recent Regional Ice-Mass Loss in Greenland", Earth and Planetary Science Letters (EPSL), doi: 10.1016/j.epsl.2012.03.033, Volumes 333-334, 1 June 2012, Pages 293-303 http://www.sciencedirect.com/science/article/pii/S0012821X12001628

Pictures of Greenland ice in a printable resolution can be found here:
www.gfz-potsdam.de/portal/gfz/Public+Relations/M40-Bildarchiv/Bildergalerie_Groenland

F. Ossing | EurekAlert!
Further information:
http://www.gfz-potsdam.de

More articles from Earth Sciences:

nachricht How much biomass grows in the savannah?
16.02.2017 | Friedrich-Schiller-Universität Jena

nachricht Canadian glaciers now major contributor to sea level change, UCI study shows
15.02.2017 | University of California - Irvine

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Biocompatible 3-D tracking system has potential to improve robot-assisted surgery

17.02.2017 | Medical Engineering

Real-time MRI analysis powered by supercomputers

17.02.2017 | Medical Engineering

Antibiotic effective against drug-resistant bacteria in pediatric skin infections

17.02.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>