HOME >> BIOLOGY >> NEWS
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
'"/>

Contact: Dr Yvonne van Breugel
breugel@nioz.nl
31-022-236-9467
Netherlands Organization for Scientific Research
18-Apr-2006


Page: 1 2

Related biology news :

1. Tough tubes -- Carbon nanotubes endure heavy wear and tear
2. Carbon dioxide and the ocean
3. Carbon monoxide protects mice from multiple sclerosis
4. Carbon monoxide protects lung cells against oxygen-induced damage
5. On the cutting edge: Carbon nanotube cutlery
6. Carbon capture, water filtration, other boreal forest ecoservices worth estimated $250 billion/year
7. Carbon monoxide may help prevent debilitating pregnancy condition
8. Carbon monoxide inhibitor controls traumatic bleeding, Tulane University researchers show
9. Carbon nanotube absorption measured in worms, cancer cells
10. Carbon nanotubes that detect disease-causing mutations developed by Pitt researcher
11. Carbon nanoparticles stimulate blood clotting, researchers report

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:11/22/2019)... ... November 21, 2019 , ... The inventors of a ... announced a major step forward with that therapy, known as SurVaxM. MimiVax LLC ... spun off from Roswell Park in 2012, has entered into a China-exclusive licensing ...
(Date:11/19/2019)... ARLINGTON, Va. (PRWEB) , ... November 19, 2019 , ... ... National Association of Chain Drug Stores (NACDS) Foundation to address substance use disorder ... . , Two individuals who have led to the program’s effectiveness in preventing ...
(Date:11/19/2019)... ... 2019 , ... The inaugural Cell & Gene Therapy Day takes place February ... event will be chaired by Dr Aiman Shalabi, VP R&D, Cell and Gene Therapies ... are witnessing significant innovation in cell and gene therapies, and we are at a ...
Breaking Biology News(10 mins):
(Date:12/4/2019)... ... ... A new survey by MedReps ( http://www.medreps.com ), a career site for medical ... companies to work for in 2020. , The 9th Annual Best Places ... community to identify which medical sales companies are currently the most sought-after in the ...
(Date:12/4/2019)... ... 2019 , ... A new study released today in STEM CELLS outlines how ... (scar tissue) buildup – also improves the range of motion of the affected limb. ... mice. , The tumor-destroying capabilities of radiation therapy can be a life saver ...
(Date:12/2/2019)... ... December 02, 2019 , ... Registration is now ... Meeting, which will be held at the Hynes Convention Center May 12-15, 2020, in ... therapy and brings together scientists, physicians, patient advocates, and other stakeholders with the goal ...
(Date:11/22/2019)... (PRWEB) , ... November 21, 2019 , ... Lajollacooks4u is ... building and cooking events company already scheduled several of its popular cooking classes and ... Parties. , The company’s Holiday Parties have been a favorite for companies ...
Breaking Biology Technology:
Cached News: