Climate warming brought on in part by human activities is producing major ecological changes in remote arctic lakes at an alarming rate, according to new University of Alberta research--the first study to show a whole lake biological response to warming in these waters. Even in the most remote, pristine parts of the earth--far from the direct influence of human activities--changes are occurring in entire ecosystems, says Dr. Neal Michelutti, a post-doctoral fellow in the U of As Faculty of Science.
"We study these lakes as models of global change," said Michelutti. "If you think of these lakes as sentinels of change they are telling us that recent warming, attributable in part to human activities, has already begun and the result is a dramatic change in the way that entire ecosystems function."
Michelutti and his research team, including his supervisor, Dr. Alexander Wolfe, from the U of As Department of Earth and Atmospheric Sciences, used an innovative technique developed at the U of A called reflectance spectroscopy. It allowed them to "see" in wavelengths what the human eye cant and to learn about the chemical composition of the sediment in six lakes on Baffin Island. In this case, they found major increases in the concentration of chlorophyll a--a good indicator of overall ecosystem production. The research is published in the current issue of Geophysical Research Letters.
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For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
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Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
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Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
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12.07.2018 | Event News
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