Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Does the ice sheet in East Antarctica shrink or grow under warming climate?

22.12.2017

International expedition investigates how the Antarctic ice sheet has changed in the course of thousands to millions of years

The Antarctic research season has begun 15 December, when researchers in the international research project MAGIC-DML returned to Dronning Maud Land in Antarctica to investigate how ice sheet volume has changed.


In the Eastern Antarctic, scientists are taking samples from the so-called nunataks. The team is now in Dronning Maud Land for the second time after an expedition in February 2017.

Jennifer Newall

Dronning Maud Land in Antarctica is almost entirely covered by the East Antarctic Ice Sheet. Even though a reduction in ice sheet volume since the last ice age has been confirmed here, it is one of the least studied areas in Antarctica.

Underneath the ice sheet is a landscape composed of hills, valleys, mountains, and planes, similar to landscapes on other continents. When the ice sheet shrinks, this landscape becomes gradually exposed and the first parts of the landscape to emerge from the ice are the summits of the highest mountains, known as nunataks.

Nunataks contain a wealth of information that can show how thick the ice sheet was during various periods of the past when global climate was colder than present and how much it has thinned until today. Nunataks also reveal unique information on the fluctuations of the ice surface during past warm periods, such as the mid-Pliocene warm interval dated back to about 3 million years ago.

During this remote period of globally warmer climate inland parts of the East Antarctic ice sheet received more snowfall and were thicker than today. Such information is especially important in the light of the ongoing climate change and its potential impacts on the East Antarctic ice sheet and the global sea level.

“Understanding how the ice has thinned is very important in order to understand how the entire ice sheet might change in the long run. We know very little about this when it comes to Dronning Maud Land,” says Arjen Stroeven, Professor in Physical Geography at Stockholm University, and Principal Investigator of the project.

Earth is constantly bombarded by cosmic radiation which consists of extremely energetic particles from space. The ice sheet acts as a shield, but when the ice sheet shrinks and nunataks are exposed, minerals in exposed rock, such as quartz, become enriched in cosmogenic nuclides. By measuring the concentration of such cosmogenic nuclides in erratic rocks on the slopes of nunataks, we can calculate how long these rocks have been exposed to cosmic radiation. As a result, researchers can ascertain how much, and at what rate, the volume of the East Antarctic Ice Sheet has changed.

Samples from the nunataks will, together with satellite imagery and topographic models, be utilised to improve ice sheet and climate models and yield information on how the East Antarctic Ice Sheet and sea level are affected by climate change; both historically and in the future.

“In Antarctica direct reconstructions of past climate conditions and ice changes are limited to few locations of deep ice cores and do not extend far enough to shed light on the ice sheet response to the mid-Pliocene warming,” says Dr. Irina Rogozhina, the leader of the modeling team in the MAGIC-DML project at the Center for Marine Environmental Sciences, University of Bremen.

“Numerous imprints left on nunataks by thicker predecessors of the modern East Antarctic Ice Sheet do no only reach much further into the Earth's history but also provide invaluable information on the impacts of warmer-than-modern climate on the ice sheet margins.”

About the research expedition:

Last season, MAGIC-DML worked in areas close to the Swedish research stations Wasa and Svea. This season, the starting point for field work is the South African research station SANAE IV. The researchers will work along a transect across the Ahlmann Ridge, the Borg Massif and the Kirwan Escarpment, a mountain area near SANAE IV. During the expedition, the researchers are provided with support and expert assistance from the Swedish Polar Research Secretariat’s logistics staff, which are responsible for transport, technology, safety and healthcare.

The field team that will work in Antarctica during the expedition consists of scientists from the universities in Glasgow (UK), Stockholm (Sweden) and West Lafayette (USA). The expedition has started in December 2017 and ends 10 February 2018.

Contact:

Irina Rogozhina
Phone: +49 421 218 65433
Email: irogozhina@marum.de

Ulrike Prange
MARUM Presse- und Öffentlichkeitsarbeit
Phone: +49 421 218 65540
Email: medien@marum.de

MARUM, using state-of-the-art methods and through participation in international projects, investigates the role of the ocean in the Earth’s system, particularly with respect to global change. It quantifies the interactions between geological and biological processes in the ocean and contributes to the sustainable use of the oceans. MARUM comprises the DFG Research Centre and the Excellence Cluster “The Oceans in the Earth System”.

Weitere Informationen:

http://www.magicdml.com

Ulrike Prange | idw - Informationsdienst Wissenschaft
Further information:
http://www.marum.de

More articles from Earth Sciences:

nachricht Research trip to the mouth of the Amazon River: on the trail of the ocean’s material cycle
22.12.2017 | Jacobs University Bremen gGmbH

nachricht Study identifies California cliffs at risk of collapse
21.12.2017 | University of California - San Diego

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Research trip to the mouth of the Amazon River: on the trail of the ocean’s material cycle

It is by far the most abundant river in the world. One fifth of the Earth’s entire freshwater supply flows from its mouth into the Atlantic pushing the ocean’s salt water several hundred kilometers out to sea. In April, Andrea Koschinsky, Professor of Geochemistry at Jacobs University, will travel to the estuary of the Amazon – as head of a recently approved, interdisciplinary research project on board the research ship, Meteor.

The Amazon River is almost 7,000 km long and is not only tremendously abundant but it also transports large quantities of trace metals such as iron and copper...

Im Focus: The Coldest Chip in the World

Physicists at the University of Basel have succeeded in cooling a nanoelectronic chip to a temperature lower than 3 millikelvin. The scientists from the Department of Physics and the Swiss Nanoscience Institute set this record in collaboration with colleagues from Germany and Finland. They used magnetic cooling to cool the electrical connections as well as the chip itself. The results were published in the journal Applied Physics Letters.

Even scientists like to compete for records, which is why numerous working groups worldwide are using high-tech refrigerators to reach temperatures as close to...

Im Focus: Star mergers: A new test of gravity, dark energy theories

Observations of neutron star collision challenge some existing theories

When scientists recorded a rippling in space-time, followed within two seconds by an associated burst of light observed by dozens of telescopes around the...

Im Focus: Error-free into the Quantum Computer Age

A study carried out by an international team of researchers and published in the journal Physical Review X shows that ion-trap technologies available today are suitable for building large-scale quantum computers. The scientists introduce trapped-ion quantum error correction protocols that detect and correct processing errors.

In order to reach their full potential, today’s quantum computer prototypes have to meet specific criteria: First, they have to be made bigger, which means...

Im Focus: Search for planets with Carmenes successful

German and Spanish researchers plan, build and use modern spectrograph

Since 2016, German and Spanish researchers, among them scientists from the University of Göttingen, have been hunting for exoplanets with the “Carmenes”...

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

Exploring the phenomenon of superconductivity

22.12.2017 | Physics and Astronomy

Does the ice sheet in East Antarctica shrink or grow under warming climate?

22.12.2017 | Earth Sciences

World's Largest Plasma Injector Brings Commercial Fusion Energy a Step Closer

22.12.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>