Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Sea bed provides information about present climatic change

22.01.2009
Lately, every drought, flood or hurricane which happens in the planet is connected with climatic change, and therefore the interest of society and scientists is getting to know this phenomenon better.

Climatic change is connected at present with the phenomenon of global warming. This is characterized by the increase of carbon dioxide (CO2 gas), which produces the reduction of heat emission to the space and provokes a higher global warming.

Although gases in the atmosphere tell us about this greenhouse effect, oceans have accumulated information for million years which allow us a better understanding of this phenomenon.

The past lets us know the present

In this process, which involves a better knowledge of carbon cycle in the sea, David Gallego Torres developed the research work "Acumulación y preservación de materia orgánica en sedimentos marinos: implicaciones en los ciclos del carbono y nutrientes" (Accumulation and preservation of organic matter in marine sediments: implications in the cycles of carbon and nutrients), under the supervision of Professors Francisca Martínez Ruiz and Miguel Ortega Huertas of the University of Granada (Andalusian Institute of Earth Sciences, CEAMA and Department of Mineralogy and Petrology).

"Oceans may act as a drain of carbon, in the way of inorganic carbonates or as organic matter settled in sediments", says Gallego Torres, who did research, among other phenomena, into the accumulation of organic matter in the geological past (Plioceno-Holoceno), in the East of the Mediterranean.

According to the researcher, "for the carrying out of this work we applied different techniques of geochemical analysis, mineralogy and isotopic analysis of organic matter for the reconstruction of the paleoceanographic conditions which induced to the accumulation of organic matter in marine sediments (sapropels), its implications in the carbon cycle and, consequently, in the climatic variation in the Mediterranean area and in the African craton, the main source of nutrients of these sediments".

Professor Francisca Martínez Ruiz highlights that the analysis research line of the climatic variability in the geological past “provides scenes of climatic changes which help us to understand the answers of the components of the climatic system in future”.

Conclusions

Doctor David Gallego Torres says that one of the main conclusions of his research is that "climatic fluctuations affect the marine environment in such a way that there may be a carbon taking by organic matter, due to these changes in marine environment’s oceanography, in such a way that the organic matter would remain accumulated again in the earth’s crust of sediments and would remain there for a while".

Other conclusions are:

- the accumulation of organic matter in marine sediments is mainly connected with an intensification of marine productivity;

- anoxic conditions (without oxygen) of the sea bed favour the preservation of such organic matter, but they can not produce an enrichment in the sediment by themselves;

- anoxia causes nutrients’ recycling maintaining a high productivity, in such a way that the interaction between primary high productivity and anoxia may promote the accumulation of organic matter in sediments.

- Such fixing of organic carbon in the litosphere is connected with the climatic system, as high concentrations of CO2 in the atmosphere facilitate a high productivity, due to an excess of carbon. Such CO2 is later fixed, in the way of organic matter, and removed of the atmospheric reservoir inducing a fall in Earth’s superficial temperature.

A paper about this thesis has been published in ScienceDirect, Palaleo, Palaeogeography, Palaeoclimatology, Palaeoecology 246 (2007) 424–439.

Carlos Centeno Cuadros | alfa
Further information:
http://prensa.ugr.es/prensa/research/verNota/prensa.php?nota=571
http://de.youtube.com/watch?v=r6LrWAZ5Y1o

More articles from Earth Sciences:

nachricht Climate satellite: Tracking methane with robust laser technology
22.06.2017 | Fraunhofer-Gesellschaft

nachricht How reliable are shells as climate archives?
21.06.2017 | Leibniz-Zentrum für Marine Tropenforschung (ZMT)

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Quantum thermometer or optical refrigerator?

23.06.2017 | Physics and Astronomy

A 100-year-old physics problem has been solved at EPFL

23.06.2017 | Physics and Astronomy

Equipping form with function

23.06.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>