Navigation Links
Researchers document acceleration of ocean denitrification during deglaciation
Date:6/3/2013

CORVALLIS, Ore. As ice sheets melted during the deglaciation of the last ice age and global oceans warmed, oceanic oxygen levels decreased and "denitrification" accelerated by 30 to 120 percent, a new international study shows, creating oxygen-poor marine regions and throwing the oceanic nitrogen cycle off balance.

By the end of the deglaciation, however, the oceans had adjusted to their new warmer state and the nitrogen cycle had stabilized though it took several millennia. Recent increases in global warming, thought to be caused by human activities, are raising concerns that denitrification may adversely affect marine environments over the next few hundred years, with potentially significant effects on ocean food webs.

Results of the study have been published this week in the journal Nature Geoscience. It was supported by the National Science Foundation.

"The warming that occurred during deglaciation some 20,000 to 10,000 years ago led to a reduction of oxygen gas dissolved in sea water and more denitrification, or removal of nitrogen nutrients from the ocean," explained Andreas Schmittner, an Oregon State University oceanographer and author on the Nature Geoscience paper. "Since nitrogen nutrients are needed by algae to grow, this affects phytoplankton growth and productivity, and may also affect atmospheric carbon dioxide concentrations."

"This study shows just what happened in the past, and suggests that decreases in oceanic oxygen that will likely take place under future global warming scenarios could mean more denitrification and fewer nutrients available for phytoplankton," Schmittner added.

In their study, the scientists analyzed more than 2,300 seafloor core samples, and created 76 time series of nitrogen isotopes in those sediments spanning the past 30,000 years. They discovered that during the last glacial maximum, the Earth's nitrogen cycle was at a near steady state. In other words, the
'/>"/>

Contact: Andreas Schmittner
aschmittner@coas.oregonstate.edu
541-737-9952
Oregon State University
Source:Eurekalert

Page: 1 2

Related biology news :

1. Researchers design sensitive new microphone modeled on fly ear
2. Researchers help threatened wheat crops in Asia, Africa
3. U of A medical researchers ID genetic marker for sporadic breast cancer
4. UCI researchers find sea anemone venom-derived compound effective in anti-obesity studies
5. MU researchers develop radioactive nanoparticles that target cancer cells
6. Genetic predictors of postpartum depression uncovered by Hopkins researchers
7. U of M researchers develop model for better testing, targeting of MPNST
8. Widespread but neglected disease a health threat in Africa, Virginia Tech researchers say
9. Penn Medicine researchers identify 4 new genetic risk factors for testicular cancer
10. Non-inherited mutations account for many heart defects, Yale researchers find
11. Researchers discover a missing link in signals contributing to neurodegeneration
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/13/2014)... New research raises the prospect of more effective ... muscle occurring in about half of all cancer patients, ... Dana-Farber Cancer Institute. , Many strategies have been tried ... that patients can,t endure potentially life-saving treatments, but none ... July 13 advanced online edition of Nature , ...
(Date:7/11/2014)... Society shows that no-take zones in Belize can ... lobster, conch, and fish recover from overfishing, but ... The reporttitled "Review of the Benefits of No-Take ... no-take areas around the world. The report was ... in marine protected areas and fisheries management. The ...
(Date:7/11/2014)... at the Department of Energy,s Oak Ridge National ... by R&D Magazine in recognition of the year,s ... the tremendous value of our National Labs," said ... at the National Labs continues to help our ... scientific and technological innovations necessary to remain globally ...
Breaking Biology News(10 mins):Antibody halts cancer-related wasting condition 2Antibody halts cancer-related wasting condition 3Belize's lobster, conch, and fish populations rebuild in no-take zones 2ORNL wins eight R&D 100s 2ORNL wins eight R&D 100s 3ORNL wins eight R&D 100s 4
... and under-diagnosed genetic disease in humans just may be ... College of Georgia researchers report. They are pursuing a ... wet form of macular degeneration, the leading cause of blindness ... iron, known to wreak cumulative havoc on the body,s organs, ...
... the tenth anniversary of the completion of the first draft of ... to complete the Wellcome Trust today launches a project to ... This will be one of the largest genome sequencing programmes ever ... in 6,000 people in the UK. The UK10K project is ...
... in German . , Missour/Leipzig. In ... African bird species with a very distinctive courtship behaviour, ... of the same species positively affects brooding females, improving ... birds in the experiment were more fertile and had ...
Cached Biology News:Link between iron overload and macular degeneration under study 2Link between iron overload and macular degeneration under study 3Ten years on, Wellcome Trust launches study of 10,000 human genomes in UK 2Ten years on, Wellcome Trust launches study of 10,000 human genomes in UK 3Pleasing to the eye 2Pleasing to the eye 3
(Date:7/10/2014)... Terascala, the industry leader in ... a former vice president of product management for Flexera ... of marketing. Terascala’s software when combined with leading compute ... highest performance and most reliable solutions for processing big ... channel expansion and broaden its product portfolio. His leadership ...
(Date:7/10/2014)... (PRWEB) July 10, 2014 OMICS Group’s ... techniques during 18-20 August, 2014 at Double Tree by ... the recent developments in Analytical & Bioanalytical research methods ... , Speaking on this occasion, Dr. Srinubabu Gedela, MD ... Acta conference is a remarkable one in bringing a ...
(Date:7/10/2014)... POINT, Ind. , July 10, 2014 ... expanded its use of capnography for respiratory ... growing group of healthcare leaders in embracing ... measures how effectively patients are breathing and ... depression occurs. By measuring the amount of ...
(Date:7/10/2014)... Utah , July 10, 2014 /PRNewswire-iReach/ ... annotation and interpretation, today announced an agreement ... (NGS) analytics for Lineagen,s NextStep Dx ... of neurodevelopmental and neurological disorders, currently offers ... microarray (CMA) testing service used by healthcare ...
Breaking Biology Technology:Terascala Expands Executive Team 2Terascala Expands Executive Team 3A Critical Review of Analytical Techniques for Improved Living Standards 2A Critical Review of Analytical Techniques for Improved Living Standards 3A Critical Review of Analytical Techniques for Improved Living Standards 4Franciscan St. Anthony Health-Crown Point Underscores Patient Safety Commitment Through Expanded Use of Capnography 2Tute Genomics Platform Selected to Provide Clinical Interpretation for Lineagen's NextStepDx PLUS Next-Generation Sequencing-Based Diagnostic Test 2Tute Genomics Platform Selected to Provide Clinical Interpretation for Lineagen's NextStepDx PLUS Next-Generation Sequencing-Based Diagnostic Test 3Tute Genomics Platform Selected to Provide Clinical Interpretation for Lineagen's NextStepDx PLUS Next-Generation Sequencing-Based Diagnostic Test 4
... Researchers in India have demonstrated that producing nanoscopic crystals of ... by the gut even if the drug is not soluble ... the medicinal drugs being developed by the pharmaceutical industry dissolve ... a major problem for administering such drugs as it means ...
... ANGELES, Oct. 6 Entertain and interact.  That,s ... . ( www.drfresh.com ), the creator of the ... company behind the successful revival of the ... http://photos.prnewswire.com/prnh/20101006/LA77977LOGO ) (Logo:   http://www.newscom.com/cgi-bin/prnh/20101006/LA77977LOGO ) ...
... Inc. Against the Company And Certain of Its Subsidiaries ... ... --> ... var s = ,; var first_result; // Results are keyed by longUrl, so we need to ...
Cached Biology Technology:Nano drugs 2A 'Fresh' Approach to Marketing: Dr. Fresh™, Inc. Goes Guerilla With Internet-Based Campaigns 2Angiotech Pharmaceuticals, Inc. Announces Commencement of Arbitration and Litigation Proceedings by QSR Holdings, Inc. Against the Company And Certain of Its Subsidiaries 2Angiotech Pharmaceuticals, Inc. Announces Commencement of Arbitration and Litigation Proceedings by QSR Holdings, Inc. Against the Company And Certain of Its Subsidiaries 3Angiotech Pharmaceuticals, Inc. Announces Commencement of Arbitration and Litigation Proceedings by QSR Holdings, Inc. Against the Company And Certain of Its Subsidiaries 4Angiotech Pharmaceuticals, Inc. Announces Commencement of Arbitration and Litigation Proceedings by QSR Holdings, Inc. Against the Company And Certain of Its Subsidiaries 5Angiotech Pharmaceuticals, Inc. Announces Commencement of Arbitration and Litigation Proceedings by QSR Holdings, Inc. Against the Company And Certain of Its Subsidiaries 6Angiotech Pharmaceuticals, Inc. Announces Commencement of Arbitration and Litigation Proceedings by QSR Holdings, Inc. Against the Company And Certain of Its Subsidiaries 7Angiotech Pharmaceuticals, Inc. Announces Commencement of Arbitration and Litigation Proceedings by QSR Holdings, Inc. Against the Company And Certain of Its Subsidiaries 8Angiotech Pharmaceuticals, Inc. Announces Commencement of Arbitration and Litigation Proceedings by QSR Holdings, Inc. Against the Company And Certain of Its Subsidiaries 9
... CTI Molecular Imaging's proprietary Focus™ detector ... and a large imaging volume that ... image multiple mice or large primateswithout ... dedicated small animal PET (Positron Emission ...
...
These 18x18 square No.1 Corning cover glasses are made from No. 0211 zinc titania glass and are 0.16 to 0.19mm thick....
...
Biology Products: