Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Oldest European lake reveals its secrets

03.09.2019

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.

LIAG/T.Grelle


Preparations of a drill core that the researchers have recovered from the 293-metre-deep lake.

LIAG/T.Grelle

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.

Wissenschaftliche Ansprechpartner:

Dr. Thomas Wonik
0511-643 3517
Thomas.Wonik@leibniz-liag.de

Originalpublikation:

https://doi.org/10.1038/s41586-019-1529-0

Weitere Informationen:

https://rdcu.be/bP6ID (view-only version of the paper)

Katharina Maaß | idw - Informationsdienst Wissenschaft
Further information:
http://www.leibniz-liag.de

More articles from Earth Sciences:

nachricht Artificial light in the Arctic
07.04.2020 | University of Delaware

nachricht Most of Earth's carbon was hidden in the core during its formative years
02.04.2020 | Smithsonian

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Belle II yields the first results: In search of the Z′ boson

The Belle II experiment has been collecting data from physical measurements for about one year. After several years of rebuilding work, both the SuperKEKB electron–positron accelerator and the Belle II detector have been improved compared with their predecessors in order to achieve a 40-fold higher data rate.

Scientists at 12 institutes in Germany are involved in constructing and operating the detector, developing evaluation algorithms, and analyzing the data.

Im Focus: When ions rattle their cage

Electrolytes play a key role in many areas: They are crucial for the storage of energy in our body as well as in batteries. In order to release energy, ions - charged atoms - must move in a liquid such as water. Until now the precise mechanism by which they move through the atoms and molecules of the electrolyte has, however, remained largely unknown. Scientists at the Max Planck Institute for Polymer Research have now shown that the electrical resistance of an electrolyte, which is determined by the motion of ions, can be traced back to microscopic vibrations of these dissolved ions.

In chemistry, common table salt is also known as sodium chloride. If this salt is dissolved in water, sodium and chloride atoms dissolve as positively or...

Im Focus: Harnessing the rain for hydrovoltaics

Drops of water falling on or sliding over surfaces may leave behind traces of electrical charge, causing the drops to charge themselves. Scientists at the Max Planck Institute for Polymer Research (MPI-P) in Mainz have now begun a detailed investigation into this phenomenon that accompanies us in every-day life. They developed a method to quantify the charge generation and additionally created a theoretical model to aid understanding. According to the scientists, the observed effect could be a source of generated power and an important building block for understanding frictional electricity.

Water drops sliding over non-conducting surfaces can be found everywhere in our lives: From the dripping of a coffee machine, to a rinse in the shower, to an...

Im Focus: A sensational discovery: Traces of rainforests in West Antarctica

90 million-year-old forest soil provides unexpected evidence for exceptionally warm climate near the South Pole in the Cretaceous

An international team of researchers led by geoscientists from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) have now...

Im Focus: Blocking the Iron Transport Could Stop Tuberculosis

The bacteria that cause tuberculosis need iron to survive. Researchers at the University of Zurich have now solved the first detailed structure of the transport protein responsible for the iron supply. When the iron transport into the bacteria is inhibited, the pathogen can no longer grow. This opens novel ways to develop targeted tuberculosis drugs.

One of the most devastating pathogens that lives inside human cells is Mycobacterium tuberculosis, the bacillus that causes tuberculosis. According to the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Aachen Machine Tool Colloquium AWK'21 will take place on June 10 and 11, 2021

07.04.2020 | Event News

International Coral Reef Symposium in Bremen Postponed by a Year

06.04.2020 | Event News

13th AKL – International Laser Technology Congress: May 4–6, 2022 in Aachen – Laser Technology Live already this year!

02.04.2020 | Event News

 
Latest News

Innovative Technologies for Satellites

07.04.2020 | Information Technology

What cells does the novel coronavirus attack?

07.04.2020 | Life Sciences

Fraunhofer IWKS Starts Project “BReCycle” on Efficient Recycling of Fuel Cells

07.04.2020 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>