Navigation Links
The carbon cycle before humans
Date:2/16/2010

so large, some prior studies hypothesized that it caused a decrease in atmospheric carbon dioxide levels. In the second Nature Geoscience paper, titled "Carbon sequestration activated by a volcanic carbon dioxide pulse during ocean anoxic event 2," the researchers tested the carbon dioxide drawdown prediction. By studying fossil plant cuticle material, they determined the amount of carbon dioxide in the atmosphere at the time the plants were growing. (The cuticle samples were collected from sites representing the western shore of the Western Interior Seaway, in present-day southwestern Utah.)

This work found that before the onset of ocean anoxia, the level of carbon dioxide in the atmosphere increased by approximately 20 percent. This significant increase is consistent with the volcanic activity invoked by the first Northwestern study (described above). The paleo-carbon dioxide reconstruction also detected two episodes of marked decrease in carbon dioxide levels -- up to 200 parts per million -- at the time of the early phase of marine carbon burial. This observation provides strong support for the carbon dioxide drawdown hypothesis.

"Our research highlights the previously unappreciated role that the sulfur cycle plays in regulating nutrient cycling, the carbon cycle and climate," said Matthew Hurtgen, assistant professor of Earth and planetary sciences in the Weinberg College of Arts and Sciences at Northwestern and lead researcher of the first study.

"These two complementary studies provide a much clearer picture of how the Earth's carbon cycle was dramatically affected by catastrophic natural events long ago," said Bradley Sageman, professor and chair of Earth and planetary sciences at Northwestern and a co-author of both papers. "Although these events played out over hundreds or thousands of years, the magnitude of the changes, in carbon dioxide levels for example, are similar to those of the last 150 years resulting from huma
'/>"/>

Contact: Megan Fellman
fellman@northwestern.edu
847-491-3115
Northwestern University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. New study warns limited carbon market puts 20 percent of tropical forest at risk
2. Mice use specialized neurons to detect carbon dioxide in the air
3. Researchers find new taste in fruit flies: carbonated water
4. Studying component parts of living cells with carbon nanotube cellular probes
5. New membrane strips carbon dioxide from natural gas faster and better
6. Green alga genome project catalogs carbon capture machinery
7. Hungry microbes share out the carbon in the roots of plants
8. Decline in uptake of carbon emissions confirmed
9. Study reveals that nitrogen fertilizers deplete soil organic carbon
10. US fires release large amounts of carbon dioxide
11. Wildfire drives carbon levels in northern forests
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/19/2014)... other science courses are increasingly being asked to ... have a new textbook to help them do ... month by Princeton Press and co-authored by scientists ... Synthesis (NIMBioS), teaches readers about basic mathematical and ... and explain biological phenomena. , Suitable for entry-level ...
(Date:8/19/2014)... LIVERPOOL, UK 19 August 2014: An engineer at ... around, despite not having a brain to communicate with ... at Harvard, Professor L Mahadevan, has developed a mathematical ... traditional view of how these soft bodied animals get ... of the central pattern generator (CPG) which states that ...
(Date:8/19/2014)... to treat pain, but its effect on pain ... a recent study reported on the Neural ... rat models of an avulsion injury to the ... neuropathic pain) were given electroacupuncture stimulation at bilateral ... (GB34). After electroacupuncture therapy, chronic neuropathic pain in ...
Breaking Biology News(10 mins):New textbook introduces undergraduates to mathematics for the life sciences 2Secrets of how worms wriggle uncovered 2
... have elucidated a key mechanism by which cancer cells ... and raw materials required to sustain runaway growth. ... Ludwig Cancer Research study also reveals how the aggressive ... therapies that should disrupt this capabilityknown as the Warburg ...
... animals will choose to steer clear of dirt but their ... risk of disease as a result. A study of ... near to used nesting material and droppings left by other mice. ... opportunity to eat outweighs an increased risk of disease from other ...
... to learn that individual "molecular muscles" within cells respond to ... cells "feel" the environment and appropriately adapt their shapes and ... 20 in the journal Nature Materials , specifically sheds ... internal signals. A computer model the researchers developed, ...
Cached Biology News:Targeting cancer's sweet tooth 2Targeting cancer's sweet tooth 3Clean living is a luxury wild animals can't afford, study suggests 2Cells' 'molecular muscles' help them sense and respond to their environments 2Cells' 'molecular muscles' help them sense and respond to their environments 3
(Date:8/18/2014)... 2014 Deep Research Report on Global ... in-depth research report on the China Linalool market. ... its definition, classification, application, and industry chain structure ... the international market analysis, including China’s domestic market ... environment & economic situation analysis. The report on ...
(Date:8/18/2014)... Sterne, Kessler, Goldstein & Fox P.L.L.C. , an intellectual ... , announced today that it has filed eleven petitions ... U.S. Patent and Trademark Office (USPTO) on behalf of ... BRLI).  These IPR petitions aim to nullify eleven patents ... patents have been asserted against GeneDx in patent infringement ...
(Date:8/18/2014)... According to the new ... (Municipal Wastewater Treatment and Industrial Wastewater Treatment), By ... By Configuration (Internal/Submerged and External/Sidestream), and By Region-Trends ... market for membrane bioreactor systems is projected to ... CAGR of 15.28% between 2014 and 2019. ...
(Date:8/18/2014)... 18. August 2014 Vier führende ... internationale klinische Studie auf, in der eine ... soll das Sehvermögen bei allen Entfernungen verbessern, ... möglicherweise keine Lese- oder Gleitsichtbrille mehr benötigen. ... FluidVision Accommodating Intraocular Lens (FluidVision ...
Breaking Biology Technology:Linalool Industry & Diphenylamine Market (Global, China) 2014 Analysis Now Available at DeepResearchReports.com 2Linalool Industry & Diphenylamine Market (Global, China) 2014 Analysis Now Available at DeepResearchReports.com 3Linalool Industry & Diphenylamine Market (Global, China) 2014 Analysis Now Available at DeepResearchReports.com 4Sterne Kessler Files 11 IPR Petitions On Behalf Of GeneDx, Inc., Subsidiary Of BioReference Laboratories, Inc. 2Sterne Kessler Files 11 IPR Petitions On Behalf Of GeneDx, Inc., Subsidiary Of BioReference Laboratories, Inc. 3Membrane Bioreactor Systems Market Worth $2,927 Million by 2019 2Membrane Bioreactor Systems Market Worth $2,927 Million by 2019 3Implantation einer revolutionären akkommodativen Linse bei Katarakt-Patienten in deutschen Augenzentren im Rahmen einer internationalen klinischen Studie 2Implantation einer revolutionären akkommodativen Linse bei Katarakt-Patienten in deutschen Augenzentren im Rahmen einer internationalen klinischen Studie 3Implantation einer revolutionären akkommodativen Linse bei Katarakt-Patienten in deutschen Augenzentren im Rahmen einer internationalen klinischen Studie 4
... Ariz., April 23 ImaRx Therapeutics,Inc. (Nasdaq: ... into an agreement,with Abbott Laboratories pursuant to which ... non-recourse promissory note with Abbott issued in,connection with ... title to,the urokinase assets, including the remaining inventory ...
... (NYSE: SGP ) today announced two agreements ... in Europe. These agreements are,in connection with conditions ... its October 2007 clearance of Schering-Plough,s acquisition of ... In two separate agreements, Pfizer and Virbac, ...
... today,announced that on April 22, 2008 its management ... Emerging Business Awards, known as the "Bennies.",BioNanomatrix won ... group of growing entrepreneurial firms in the Philadelphia ... the,award on behalf of the company., The ...
Cached Biology Technology:ImaRx Therapeutics Satisfies Abbott Note Obligation Associated With the Acquisition of Urokinase 2ImaRx Therapeutics Satisfies Abbott Note Obligation Associated With the Acquisition of Urokinase 3Schering-Plough Announces Planned Divestiture of Select Animal Health Products in Europe 2BioNanomatrix Named 'Best Management Team' at the 2008 Ben Franklin Emerging Business Awards 2
PFK-2 car (P-17)...
... contains 5 ml Dynabeads Epoxy (4.5 m). ... (epoxy) reactive groups. Ideal for coupling of ... hydrophobically on initial coupling with covalent binding ... and sulphydryll groups (SH)) occurring within 16-20 ...
LTBP-2 (7B10)...
... [198C679.2.1] to Presenilin 2 Alzheimer's disease ... the disease carry mutations in the presenilin ... protein (APP). These disease-linked mutations result in ... amyloid-beta (main component of amyloid deposits found ...
Biology Products: