In a recently published Nature article, an international research team with LIAG participation unlocks the secrets of Lake Ohrid that is located between Northern Macedonia and Albania. With an age of 1.4 million years, Lake Ohrid is not only the oldest lake in Europe, but also an ideal witness of Mediterranean climate history. The drilling took place within the framework of the ICDP (International Continental Scientific Drilling Program). The research team discovered pronounced low-pressure areas with intensive rainfall during interglacial periods. Similar phenomena could occur again in the future, as a result of man-made climate change.
In 2013, the international research team with LIAG participation began its investigations on Lake Ohrid between Macedonia and Albania. Researchers from various European countries drilled 568 metres into the sediment layers below the lake.
The drilling platform lay on Lake Ohrid for several weeks. An international research team carried out various drillings and measurements.
Five more years and various geological, chemical and physical analyses were needed to unlock the secrets of the sediments at the bottom of Lake Ohrid. Now, the research team was able to publish its results within the scientific journal “nature”.
Lake Ohrid is exactly 1.36 million years old and has experienced several warm and ice ages. Geochemical data and pollen findings show that it rained more heavily in the northern Mediterranean during the warm periods. The intensive rainfall occurred mainly in autumn. Due to the warm sea surface and the influx of humid Atlantic air masses, pronounced low-pressure areas developed in the northern Mediterranean.
These phenomena may be repeated in the Mediterranean region in the face of man-made climate change. In its regular reports, the Intergovernmental Panel on Climate Change (IPCC) not only summarizes the state of scientific knowledge on climate change, but also forecasts the consequences of global warming for individual areas.
The IPCC's forecasts for the Mediterranean region do not provide a clear picture. With the findings from drilling in Lake Ohrid, researchers are now able to calculate more reliable scenarios for the Mediterranean region.
"What is special about Lake Ohrid is that it has hardly been disturbed by external influences in the last 1.4 million years," says Dr. Thomas Wonik, department head at LIAG and part of the international research team. The lake has never completely dried up, nor have catastrophic events distorted the geological picture.
That's why the researchers can reconstruct the local climate history very precisely. One approach is to compare the natural radioactivity of sediments with global climate reference curves. These curves show the cyclical climate history of the last five million years.
The sediments from Lake Ohrid highly correlate with the results of the global climate reference curve and show the same variations between ice ages and interglacial warm periods. "Rarely in geophysics can we read the dynamics of warm and cold periods so precisely from physical borehole measurements as in the case of Lake Ohrid," says Wonik.
Dr. Thomas Wonik
https://rdcu.be/bP6ID (view-only version of the paper)
Katharina Maaß | idw - Informationsdienst Wissenschaft
Reconstructing Anak Krakatau flank collapse that caused Dec. 2018 Indonesian tsunami
02.09.2019 | Geological Society of America
Boreal forest fires could release deep soil carbon
22.08.2019 | NASA/Goddard Space Flight Center
The demand for even higher resolution videos will continue to increase in the coming years. For this reason, the German public service broadcaster WDR and the Fraunhofer Heinrich Hertz Institute HHI will collaborate in the coming months to test the Video Coding possibilities offered by the next international standard VVC/H.266.
VVC/H.266 is the successor standard to HEVC/H.265. The latter is currently the most modern and efficient standard for Video Coding and is used, for example, in...
The recording of images of the human brain and its therapy in neurodegenerative diseases is still a major challenge in current medical research. The so-called blood-brain barrier, a kind of filter system of the body between the blood system and the central nervous system, constrains the supply of drugs or contrast media that would allow therapy and image acquisition. Scientists at the Max Planck Institute for Polymer Research (MPI-P) have now produced tiny diamonds, so-called "nanodiamonds", which could serve as a platform for both the therapy and diagnosis of brain diseases.
The blood-brain barrier is a physiological boundary layer that works highly selectively and thus protects the brain: On the one hand, pathogens or toxins are...
For the first time, a team led by Innsbruck physicist Ben Lanyon has sent a light particle entangled with matter over 50 km of optical fiber. This paves the way for the practical use of quantum networks and sets a milestone for a future quantum internet.
The quantum internet promises absolutely tap-proof communication and powerful distributed sensor networks for new science and technology. However, because...
Since their experimental discovery, magnetic skyrmions - tiny magnetic knots - have moved into the focus of research. Scientists from Hamburg and Kiel have now been able to show that individual magnetic skyrmions with a diameter of only a few nanometres can be stabilised in magnetic metal films even without an external magnetic field. They report on their discovery in the journal Nature Communications.
The existence of magnetic skyrmions as particle-like objects was predicted 30 years ago by theoretical physicists, but could only be proven experimentally in...
Theoretical physicists at Trinity College Dublin are among an international collaboration that has built the world's smallest engine - which, as a single calcium ion, is approximately ten billion times smaller than a car engine.
Work performed by Professor John Goold's QuSys group in Trinity's School of Physics describes the science behind this tiny motor.
29.08.2019 | Event News
16.08.2019 | Event News
14.08.2019 | Event News
03.09.2019 | Life Sciences
03.09.2019 | Earth Sciences
03.09.2019 | Trade Fair News