Navigation Links
Carbon cycle was already disrupted millions of years ago

Dutch researcher Yvonne van Breugel analysed rocks from seabeds millions of years old. Carbon occurs naturally in two stable forms; atomic mass 12 (99 percent) and atomic mass 13 (1 percent). Episodes in the Jurassic and Cretaceous periods were characterised by a relatively strong increase in 12C. The analyses have shown that this was caused by a sudden large-scale release of carbon from stocks stored in the ocean floor or peats and bogs.

The atmospheric carbon dioxide concentration is increasing as a consequence of the large-scale use of fossil fuels in the industrial era. This has apparently brought about a stronger relative increase in the light carbon isotope 12C. Due to this the ratio of the stable carbon isotopes 13C/12C has show a clearly measurable decrease of 0.1%. However in the Jurassic and Cretaceous periods, 180 and 120 million years ago, there were periods with a shift four times as large in a period of just several tens of thousands of years. Where did all of that light carbon suddenly come from?

Van Breugel investigated chemical fossils of marine algae and land plants from sediments deposited in the aforementioned periods. Plants and algae assimilate CO2 from the air and water. Consequently changes in the isotope ratio are recorded in organic material. These chemical fossils have been well preserved because large parts of the oceans in the Jurassic and Cretaceous periods contained little (if any) oxygen.

In sediment cores from various widely-separated areas Van Breugel found a 0.4% decrease in the 13C/12C ratio. This means that there were large-scale changes in the carbon cycle over a short geological timescale of several tens of thousands of years. From the results Van Breugel deduced that large quantities of 12C in the form of CO2 or methane were suddenly released into the atmosphere.

This could have been the result of methane being released from gas hydrates which were buried in the ocean floor. It is not clear w hich mechanism was responsible for this. Methane could also have been formed under high pressure in coal seams and then subsequently released upon coming into contact with magma. A third option is that carbon from organically-rich sediment came into contact with hot magma. As a result of this the organic molecules combusted into CO2 and water.

Yvonne van Breugel's research was funded by NWO.


'"/>

Source:Netherlands Organization for Scientific Research


Related biology news :

1. Carbon nanotube absorption measured in worms, cancer cells
2. Carbon nanotubes that detect disease-causing mutations developed by Pitt researcher
3. Second messenger NAADP shows fast, dose-related impact on satiety cycle
4. A novel method to measure circadian cycles
5. Microbe has huge role in ocean life, carbon cycle
6. Marine bacterium suspected to play role in global carbon and nitrogen cycles
7. Hidden sponges determine coral reefs nutrient cycle
8. FSU biologists describe key role of signal-transcribing gene during cell cycle
9. Web model of influenza-host lifecycles will aid scientists in creating anti-viral drugs
10. Of mice, men, trees and the global carbon cycle
11. The vicious cycle of rainforest destruction
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/18/2017)... April 18, 2017  Socionext Inc., a global expert in SoC-based ... edge server, the M820, which features the company,s hybrid codec technology. ... by Tera Probe, Inc., will be showcased during the upcoming Medtec ... show at the Las Vegas Convention Center ... Click here ...
(Date:4/13/2017)... 13, 2017 UBM,s Advanced Design and Manufacturing ... feature emerging and evolving technology through its 3D Printing ... run alongside the expo portion of the event and ... demonstrations focused on trending topics within 3D printing and ... manufacturing event will take place June 13-15, 2017 at the ...
(Date:4/11/2017)... , April 11, 2017 Crossmatch®, ... secure authentication solutions, today announced that it has ... Advanced Research Projects Activity (IARPA) to develop next-generation ... program. "Innovation has been a driving ... Thor program will allow us to innovate and ...
Breaking Biology News(10 mins):
(Date:10/7/2017)... ... October 06, 2017 , ... ... advanced instruments and applications consulting for microscopy and surface analysis, Nanoscience Instruments ... consulting, Nanoscience Analytical offers a broad range of contract analysis services for ...
(Date:10/7/2017)... Mass. , Oct. 6, 2017  The ... work of three scientists, Jacques Dubochet, Joachim ... breakthrough developments in cryo-electron microscopy (cryo-EM) ... technology within the structural biology community. The winners ... Scientists can now routinely produce highly resolved, three-dimensional ...
(Date:10/6/2017)... Washington, D.C. (PRWEB) , ... October 06, 2017 ... ... Cure) will host a lunch discussion and webinar on INSIGhT, the first-ever adaptive ... INSIGhT Principal Investigator, Dana-Farber Cancer Institute. The event is free and open to ...
(Date:10/5/2017)... (PRWEB) , ... October 05, 2017 , ... Understanding the ... newest frontiers in human health. Gut Love: You Are My Future, the newest exhibit ... artist’s perspective as it explores the human condition through the lens of the gut ...
Breaking Biology Technology: