The largest ice shelf in the Arctic has broken, and scientists who have studied it closely say it is evidence of ongoing and accelerated climate change in the north polar region. The Ward Hunt Ice Shelf is located on the north coast of Ellesmere Island in Canadas Nunavut territory and its northernmost national park. This ancient feature of thick ice floating on the sea began forming some 4,500 years ago and has been in place for at least 3,000 years.
Warwick Vincent and Derek Mueller of Laval University in Quebec City, Quebec, and Martin Jeffries of the University of Alaska Fairbanks have studied the Ward Hunt Ice Shelf on site and through RADARSAT imagery and helicopter overflights. They report in the journal Geophysical Research Letters that a three decade long decline in the Ward Hunt Ice Shelf culminated in its sudden break-up between 2000 and 2002. It fragmented into two main parts with many additional fissures. It also calved a number of ice islands, some of which are large enough to pose a danger to shipping and to drilling platforms in the Beaufort Sea.
An immediate consequence of the ice shelfs rupture was the loss of almost all of the freshwater from the northern hemispheres largest epishelf lake, which had been dammed behind it in 30 kilometer [20 mile] long Disraeli Fiord. An epishelf lake is a body of mostly freshwater trapped behind an ice shelf. The freshwater layer in the Disraeli Fiord measured 43 meters [140 feet] in depth and lay atop 360 meters [1,200 feet] of denser ocean water. The loss of fresh and brackish water has affected a previously reported unique biological community, consisting of both freshwater and marine species of plankton. The breakup of the ice shelf has also reduced the habitat available for cold-tolerant communities of microscopic animals and algae that live on the upper ice surface.
Harvey Leifert | AGU
How is climate change affecting fauna in the Arctic?
22.05.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
Sea level as a metronome of Earth's history
19.05.2017 | Université de Genève
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.
In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...
Dental plaque and the viscous brown slime in drainpipes are two familiar examples of bacterial biofilms. Removing such bacterial depositions from surfaces is...
For the first time, scientists have succeeded in studying the strength of hydrogen bonds in a single molecule using an atomic force microscope. Researchers from the University of Basel’s Swiss Nanoscience Institute network have reported the results in the journal Science Advances.
Hydrogen is the most common element in the universe and is an integral part of almost all organic compounds. Molecules and sections of macromolecules are...
22.05.2017 | Event News
17.05.2017 | Event News
16.05.2017 | Event News
22.05.2017 | Materials Sciences
22.05.2017 | Life Sciences
22.05.2017 | Physics and Astronomy