With dog food and a pack of huskies Dr. Veit Helm would not get far on his Antarctic expeditions. Instead, the geophysicist at the Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association conducts research on the icy continent from on board an aircraft and successfully completed the first measurement campaign of the new Polar 6 research plane a few days ago.
The flights were part of the “CryoSat-2 validation experiment”, which scientists of the Alfred Wegener Institute carried out together with colleagues from the Australian University of Tasmania in East Antarctica. They received support from the Australian Antarctic Division (AAD) and the European Space Agency (ESA). “We surveyed the Totten Glacier and the Law Dome to acquire data that will enable us to check the accuracy of ESA’s CryoSat satellite,” says Dr. Veit Helm.
The CryoSat-2 satellite has been orbiting around the Earth since 8 April 2010. It records changes in sea ice thickness and changing surface heights of land ice in the Arctic and Antarctic and in this way supplies important data for climate research. Over Antarctica, for instance, it measures to an accuracy of a few centimetres how high glaciers rise up from the surface using its two radar antennas. Researchers utilise these regularly collected data to check whether and to what extent the inland ice masses of the Antarctic increase or shrink.
To make sure that the satellite is collecting data with maximum precision, however, the scientists regularly conduct comparative measurements from the air and on the ground. “The CryoSat-2 validation experiment examines the influence that physical properties of the top snow and ice layer exert on the radar signal that the satellite emits and receives. Depending on such factors as the particle size of the snow, the extent to which it has compacted and how it is layered, the radar signal can penetrate deeper or less deep and is thus reflected differently. If we ignore these factors in the data evaluation, it may result in misinterpretations,” explains Veit Helm.
To understand the significance of such influencing variables, the scientists have to conduct validation experiments in the field. The measurements of the Polar 6, the research aircraft newly put into service and sponsored by the Federal Ministry of Education and Research, form a link between the satellite measurements from space and corroborative investigations on the ground. “Polar 6 not only has the same radar system as the satellite. We also have a laser scanner on board that scans the ice surface at a high resolution so we can develop highly precise elevation models, which in turn serve as comparative figures for the CryoSat measurements,” states Veit Helm.
While the German geophysicist circled over the two glaciers in the aircraft, his Australian colleagues drove through the selected investigation areas in snowmobiles. “The snowmobiles were equipped with a GPS system that recorded the surface topography of the terrain. In addition, the ground team dug shafts in the top snow and ice layer to study its physical properties,” says Veit Helm.
The Totten Glacier near Casey, the Australian research station, is considered to be the region with the greatest surface changes in East Antarctica. It is undergoing surface lowering and is therefore perfectly suited for the validation measurements. For the geophysicists the goal of the CryoSat mission is to record changes in the polar ice masses down to the smallest possible detail via satellite.
In this way the researchers not only have a significant edge over South Pole conqueror Roald Amundsen in terms of knowledge and a helper in space. On every measurement flight of the Polar 6 the scientists and crew can also trust in warm polar suits and a well devised emergency pack. For each person the latter contains, for example, a sleeping bag and sleeping pad, socks, gloves, sunscreen, cutlery, toilet paper, dry food rations for seven days and a portable satellite telephone that the crew always keeps handy.
The Alfred Wegener Institute conducts research in the Arctic, Antarctic and oceans of the high and middle latitudes. It coordinates polar research in Germany and provides major infrastructure to the international scientific community, such as the research icebreaker Polarstern and stations in the Arctic and Antarctica. The Alfred Wegener Institute is one of the seventeen research centres of the Helmholtz Association, the largest scientific organisation in Germany.
Ralf Röchert | idw
World’s oldest known oxygen oasis discovered
18.01.2018 | Eberhard Karls Universität Tübingen
A close-up look at an uncommon underwater eruption
11.01.2018 | Woods Hole Oceanographic Institution
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
19.01.2018 | Materials Sciences
19.01.2018 | Health and Medicine
19.01.2018 | Physics and Astronomy