To coincide with the launch of the International Polar Year (IPY) 2007-2008, Alain Hubert and fellow explorer Dixie Dansercoer ventured out onto the sea-ice to embark upon a trek from Siberia to northern Greenland via the North Pole – a route never before attempted.
Throughout the expedition, the polar explorers had to endure temperatures down to -40ºC, encounters with polar bears and the incredible physical demand of having to drag heavy sledges across pressure ridges of sea-ice piled up several metres high as well as cross open water where the ice had fractured. Nevertheless, Alain and Dixie took time out every 50 km to make snow-depth measurements for the CryoSat mission.
"It wasn't really difficult to take these measurements for CryoSat," said Alain, "It became part of our routine. The difficult part of the expedition was putting one foot in front of the other when the ice is breaking up around you. As co-founder of the International Polar Foundation, a scientist as well as a seasoned explorer - I aim to form a kind of 'bridge' between science and society. Observing the changes that are occurring in the fragile Arctic environment will help lead to a better understanding of the effects of climate change, and ultimately the Earth system as a whole. CryoSat is an exciting mission that will help answer questions about the polar ice so we were very happy to contribute through our Arctic Arc expedition."
Since the Earth Explorer CryoSat mission, which is due for launch next year, is designed to measure tiny variations in the thickness of floating sea-ice and ice on land, understanding the effects that the overlying snow can have on the measurement of ice elevation is of huge importance. To this end, ESA has in place a dedicated validation programme that involves a number of field campaigns in the polar regions. Measurements collected on the ice and from the air are crucial to fully understand and characterise the geophysical uncertainties in the CryoSat products so that the data CryoSat delivers is interpreted as accurately as possible.
During a presentation held this week at ESA-ESTEC in the Netherlands Alain handed over the dataset to Richard Francis ESA's Project Manager for CryoSat, who commented that, "While snow-depth information holds the key to producing accurate maps of ice-thickness change over time, there are relatively few basic ground-measurements readily available. So when Alain offered to take measurements during his expedition, the CryoSat project was extremely grateful."
In turn, Alain and Dixie were also grateful for help provided by an existing ESA satellite. Under an ESA IPY project, they were able to rely on images from Envisat to guide them through some dangerous ice-break up. Alain explained, "As we approached the coast of northern Greenland, the sea ice in the Lincoln Sea began to break up chaotically - something we really weren't expecting. We realised there was no way we could take our planned route to reach land. Fortunately, however, we were guided by expedition router who relied on information provided by the Danish Technical University using data from ESA's Envisat satellite to help us circumnavigate the open waters and eventually reach land safely."
Malcolm Davidson ESA's CryoSat Validation Manager noted that, "ESA has now released the snow-depth data collected by the Arctic Arc expedition to the CryoSat Validation and Retrieval Team. The team has been quite eager to get the data and start the analysis. Ultimately we expect that – in conjunction with the core ESA-sponsored airborne campaigns and similar initiatives from other polar expeditions – the data will help us better measure ice-thickness changes over time from space with CryoSat-2."
Malcolm Davidson | alfa
Ice cave in Transylvania yields window into region's past
28.04.2017 | National Science Foundation
Citizen science campaign to aid disaster response
28.04.2017 | International Institute for Applied Systems Analysis (IIASA)
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
28.04.2017 | Event News
20.04.2017 | Event News
18.04.2017 | Event News
28.04.2017 | Medical Engineering
28.04.2017 | Earth Sciences
28.04.2017 | Life Sciences