Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Intensified ice sheet movements do not affect rising sea levels

09.07.2008
Meltwater is rapidly increasing the tempo of glacial movements on the rim of the Greenland ice sheet.

Over the long term, however, this process is interrupted as meltwater drains away via broad channels, as a result of which ice movement decreases once again. Ultimately, this is not a cause of accelerated sea level rise. These are the findings presented by researchers from Utrecht University in the 4 July issue of the scientific journal Science.

Scientists from around the world are closely monitoring the Greenland ice sheet, as accelerated glacial melting is believed to cause rising sea level. The theory is that increased volumes of meltwater accelerate the movement of ice to warmer low-lying areas and, consequently, even more intensified glacial melting. Utrecht University researchers, however, insist that this is not how the process actually works in the long term.

GPS measurements

Since the early 1990s, Utrecht University scientists have tracked the movement of the West Greenland ice sheet using GPS measurements. During warmer weather, the ice appears to move – over the course of a few days – as much as four times faster, because the meltwater acts as lubricant between the ice and the subsoil. As a result, the ice sheet moves more rapidly to lower and warmer areas.

It seems, however, that over time larger channels form in the ice that are able to drain off the increased volumes of meltwater. As a result, the water pressure on the ground once again decreases, as does the tempo of the ice movement. Over the long term, therefore, the feedback mechanism between the glacial melting and ice sheet movement contributes little to rising sea levels.

Peter van der Wilt | alfa
Further information:
http://www.uu.nl

More articles from Earth Sciences:

nachricht Six-decade-old space mystery solved with shoebox-sized satellite called a CubeSat
15.12.2017 | National Science Foundation

nachricht NSF-funded researchers find that ice sheet is dynamic and has repeatedly grown and shrunk
15.12.2017 | National Science Foundation

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Engineers program tiny robots to move, think like insects

15.12.2017 | Power and Electrical Engineering

One in 5 materials chemistry papers may be wrong, study suggests

15.12.2017 | Materials Sciences

New antbird species discovered in Peru by LSU ornithologists

15.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>