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

0

GOOD

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:5/22/2013)... May 22, 2013 Early screening for prostate cancer ... testing is for women, thanks to UC Irvine research ... Chemical Society . , After more than a decade ... to clearly identify clinically usable markers for prostate cancer ... far sooner, with greater accuracy and at dramatically lower ...
(Date:5/21/2013)... Biologists have known for a long time that ... isn,t well understood, particularly for plants. But it may ... of Australian National University and the U. S. National ... be published 21 May in the journal Nature ... have faster-changing genomes. , Drawing from a database of ...
(Date:5/21/2013)... analysis shows that the nation,s land and water resources ... produce up to 25 billion gallons of algae-based fuel ... country,s yearly needs. , The findings come from an ... needed to grow significant amounts of algae in large, ... the May 7 issue of Environmental Science and ...
Breaking Biology News(10 mins):UCI chemists devise inexpensive, accurate way to detect prostate cancer 2UCI chemists devise inexpensive, accurate way to detect prostate cancer 3Small but speedy: Short plants live in the evolutionary fast lane 2Going green: Nation equipped to grow serious amounts of pond scum for fuel 2Going green: Nation equipped to grow serious amounts of pond scum for fuel 3Going green: Nation equipped to grow serious amounts of pond scum for fuel 4
... rates are concentrated in the northern part of the ... according to a report in Cancer Epidemiology, Biomarkers ... for Cancer Research. Ahmedin Jemal, D.V.M., Ph.D., vice ... said the decrease in death rates ranged from about ...
... (July 6, 2011) The type of primary insurance ... the United States according to a study in the ... College of Surgeons. As a result, the type ... risk factor during preoperative risk stratification and planning, the ...
... a compact fluorescent light bulb continuously releases mercury vapor ... total amount can exceed safe human exposure levels in ... in Environmental Engineering Science , a peer-reviewed online ... (www.liebertpub.com). The article is available free online at ...
Cached Biology News:Southern US states lag in reducing death rates from colorectal cancer 2Outcomes for cardiac valve procedure patients are affected by insurance status 2Mercury vapor released from broken compact fluorescent light bulbs can exceed safe exposure levels 2
(Date:5/23/2013)... Bed bugs already cost Alton Housing Authority thousands. ... a report from kmov.com suggested that the said office might ... Meanwhile, to be of help, My Cleaning Products gave tips ... bug exterminator service. , The report, which was posted ... spent $35,000 for bed bug elimination, My Cleaning ...
(Date:5/23/2013)... May 23, 2013 Watlow®, an ... complete thermal systems, recently introduced its new catalog, ... of experience in designing and manufacturing industrial heaters, ... products to serve diverse customer needs. , A ... at the beginning of the book. These options ...
(Date:5/23/2013)... Wilmington, DE (PRWEB) May 23, 2013 Just ... book by executive coach and author Barbara Roche: “Commit to ... Stand Out.” , Filled with helpful tips and quotes from ... from business leaders, and tangible exercises that readers can do ... women how to achieve their personal and professional goals. ...
(Date:5/22/2013)... MA (PRWEB) May 22, 2013 ... in Alexandria, VA for the Oak Ridge ... which will take place at the Hilton Alexandria ... Biodetection Technologies 2013 conference on June ... Already Participating: , AdSave, American Elements, Applied Research ...
Breaking Biology Technology:Bed Bug Exterminator Service Could Cost AHA $250K, My Cleaning Products Gives Tips How to Save Apartments from Costly Bed Bug Treatment 2Watlow Introduces Its New Industrial Heater Catalog 2Biodetection Technologies 2013 and Oak Ridge National Lab’s Biosurveillance Symposium to Bring Together Leading Organizations in Alexandria, VA from June 17-19, 2013 2Biodetection Technologies 2013 and Oak Ridge National Lab’s Biosurveillance Symposium to Bring Together Leading Organizations in Alexandria, VA from June 17-19, 2013 3Biodetection Technologies 2013 and Oak Ridge National Lab’s Biosurveillance Symposium to Bring Together Leading Organizations in Alexandria, VA from June 17-19, 2013 4Biodetection Technologies 2013 and Oak Ridge National Lab’s Biosurveillance Symposium to Bring Together Leading Organizations in Alexandria, VA from June 17-19, 2013 5
... Health Care Forum discusses the future of Continuing ... ... Accredited online nursing courses,are replacing traditional classroom-based courses, offering nurses ... options., Ann Johnson, CEO of Wild Iris Medical Education took ...
... June 2 RainDance Technologies, Inc.,a provider ... and,disease research, today announced the appointment of ... immediately., "As RainDance solutions enter commercial ... establish our manufacturing and financial capabilities,",said Chris ...
... The following release was,issued today by Thomas P. DiNapoli, Comptroller ... York State Common Retirement Fund, the Lead Plaintiff,in the In ... DISTRICT COURT NORTHERN DISTRICT OF CALIFORNIA SAN JOSE ... ) SECURITIES LITIGATION, Master File No. 99-CV-20743 RMW (PVT) ...
Cached Biology Technology:Modernizing Continuing Education With Online Courses 2RainDance Appoints Kelly Chief Operating Officer 2Notice of Initial Distribution of Net Settlement Funds 2Notice of Initial Distribution of Net Settlement Funds 3
Olig2 Immunogen: Synthetic peptide from rat. Available Date: 9-19-2006...
Proteinase K Buffer 3.9 ml...
Anti-Indolamine (Indoleamine) 2,3-dioxygenase Immunogen: Recombinant human IDO. Available Date: 38454...
...
Biology Products: