In order to carry out these paleoclimatic studies, scientists have developed isotopic analysis in animal and vegetal remains of different Granada areas. The most outstanding results reveal that 20,000 years ago, the average temperature was about seven degrees centigrade lower than the current temperatures, and the concentration of CO2 in the atmosphere was close to 180 parts per million (ppm), as opposed to the current 370 ppm.
The climate, the CO2 concentration and the development level of the vegetal cover are registered in the isotopic contents of the carbonates present in shells of gastropods and crustaceans, mammals bones and teeth, remains of wood and cave stalagmites. These remains can provide very useful information about the climatic conditions in the past and, therefore, about the situations that may be caused by the global climatic change.
Granada experts have analysed oxygen, carbon and nitrogen isotopes in areas like Padul peat bog and Guadix-Baza basin, both of them in the Granada province. Thanks to the analysis of the isotopes found in biological samples of the most representative vegetal and animal remains in the area, the climate of 1.7 million of years ago has been ‘reconstructed’.
The remains allow the analysis of the isotopic composition of the water those animals drank. This information is useful to know the climate of that period, because the proportion of isotopes oxigen-18/oxigen-16 in water depends on the yearly average temperatures. For example, in cold periods, the composition of these isotopes decreases. Such variations are registered in the bones of animals.
After carrying out the analysis, scientists have concluded that the average temperatures were seven degrees centigrade lower during the end of the last glaciation. Also, they have stated that in that time, it rained less than nowadays because, according to these experts, the global warming causes more rain.
Ismael Gaona | alfa
Upcycling 'fast fashion' to reduce waste and pollution
03.04.2017 | American Chemical Society
Litter is present throughout the world’s oceans: 1,220 species affected
27.03.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
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...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
26.04.2017 | Materials Sciences
26.04.2017 | Agricultural and Forestry Science
26.04.2017 | Physics and Astronomy