New study focuses on nitrogen in waterways as cause of nitrous oxide in the atmosphere | News | Notre Dame News | University of Notre Dame Skip To Content Skip To Navigation Skip To Search University of Notre Dame Notre Dame News Experts ND in the News Subscribe About Us Home Contact Search Menu Home › News › New study focuses on nitrogen in waterways as cause of nitrous oxide in the atmosphere New study focuses on nitrogen in waterways as cause of nitrous oxide in the atmosphere Published: December 21, 2010 Author: William G. Gilroy Jake Beaulieu, a postdoctoral researcher at the Environmental Protection Agency in Cincinnati, Ohio, who earned his doctorate at the University of Notre Dame, and Jennifer Tank, Galla Professor of Biological Sciences at the University, are lead authors of new paper demonstrating that streams and rivers receiving nitrogen inputs from urban and agricultural land uses are a significant source of nitrous oxide to the atmosphere. Nitrous oxide is a potent greenhouse gas that contributes to climate change and the loss of the protective ozone layer. Nitrogen loading to river networks from urban and agricultural activities is a potentially important source of nitrous oxide emission to the atmosphere. It occurs through a microbial process called denitrification, which converts dissolved nitrate-nitrogen to nitrous oxide and dinitorgen gases. In a paper appearing this week in the Proceedings of the National Academy of Sciences (PNAS), Beaulieu and Tank describe how they measured nitrous oxide production rates from denitrification in 72 streams draining multiple land-use types across the United States. They found that the amount of nitrous oxide produced in streams is related to human activities that release nitrogen into the environment, such as fertilizer use and sewage discharges. “Runoff from agricultural and urban watersheds has increased the availability of nitrogen in streams and rivers, greatly increasing nitrous oxide production rates,” Beaulieu said. “This research shows that river networks play an important role in how human nitrogen use affects climate change and ozone loss.” The new study reports that streams and river networks are the source of at least 10 percent of human-caused nitrous oxide emission to the atmosphere worldwide, which is three times the amount estimated by an earlier report from the Intergovernmental Panel on Climate Change (IPCC). Beaulieu and Tank suggest that reductions in nitrous oxide emissions from stream and river networks can be achieved through changes in urban and agricultural land use patterns, such as reduced agricultural fertilizer application. The study appearing in PNAS was funded by the National Science Foundation. Beaulieu and Tank conducted this research in collaboration with colleagues from Michigan State University, University of New Hampshire, University of Wyoming, Oak Ridge National Laboratory, University of Tennessee, Marine Biological Laboratory in Woods Hole, Mass., Oregon State University, Chesapeake Biological Laboratory, University of New Mexico, Kansas State University, Arizona State University, U.S. Forest Service., Montana State University, Virginia Polytechnic Institute and State University, Central Washington University, Ball State University, Wright State University, University of Georgia, Indiana University, University of Canterbury in Christchurch, New Zealand, U.S. Geological Survey and Washington State University. Contact: Jake Beaulieu, Environmental Protection Agency, 513-569-7842, beaulieu.jake@epamail.epa.gov Posted In: Research Home Experts ND in the News Subscribe About Us Related October 05, 2022 Astrophysicists find evidence for the presence of the first stars October 04, 2022 NIH awards $4 million grant to psychologists researching suicide prevention September 29, 2022 Notre Dame, Ukrainian Catholic University launch three new research grants September 27, 2022 Notre Dame, Trinity College Dublin engineers join to advance novel treatment for cystic fibrosis September 22, 2022 Climate-prepared countries are losing ground, latest ND-GAIN index shows For the Media Contact Office of Public Affairs and Communications Notre Dame News 500 Grace Hall Notre Dame, IN 46556 USA Facebook Twitter Instagram YouTube Pinterest © 2022 University of Notre Dame Search Mobile App News Events Visit Accessibility Facebook Twitter Instagram YouTube LinkedIn