Shepster
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December 2, 2014 | Marcie Grabowski
Human-induced changes to Earth’s carbon cycle—for example, rising atmospheric carbon dioxide and ocean acidification—have been observed for decades. However, a study published in Science showed human activities, in particular industrial and agricultural processes, have also had significant impacts on the upper ocean nitrogen cycle.
The rate of deposition of reactive nitrogen (i.e., nitrogen oxides from fossil fuel burning and ammonia compounds from fertilizer use) from the atmosphere to the open ocean has more than doubled globally over the last 100 years. This anthropogenic addition of nitrogen has reached a magnitude comparable to about half of global ocean nitrogen fixation (the natural process by which atmospheric nitrogen gas becomes a useful nutrient for organisms).
David Karl, professor of oceanography and director of the Daniel K. Inouye Center for Microbial Oceanography at the University of Hawaiʻi at Mānoa, teamed up with researchers from Korea, Switzerland and the U.S. National Oceanic and Atmospheric Administration to assess changes in nitrate concentration between the 1960s and 2000s across the open North Pacific Ocean.
http://www.hawaii.edu/news/2014/12/02/human-activity-impacts-oceans-nitrogen-cycle/
http://www.scienceclarified.com/Mu-Oi/Nitrogen-Cycle.html
http://www.hngn.com/articles/51169/20141201/ocean-nitrates.htm
Human-induced changes to Earth’s carbon cycle—for example, rising atmospheric carbon dioxide and ocean acidification—have been observed for decades. However, a study published in Science showed human activities, in particular industrial and agricultural processes, have also had significant impacts on the upper ocean nitrogen cycle.
The rate of deposition of reactive nitrogen (i.e., nitrogen oxides from fossil fuel burning and ammonia compounds from fertilizer use) from the atmosphere to the open ocean has more than doubled globally over the last 100 years. This anthropogenic addition of nitrogen has reached a magnitude comparable to about half of global ocean nitrogen fixation (the natural process by which atmospheric nitrogen gas becomes a useful nutrient for organisms).
David Karl, professor of oceanography and director of the Daniel K. Inouye Center for Microbial Oceanography at the University of Hawaiʻi at Mānoa, teamed up with researchers from Korea, Switzerland and the U.S. National Oceanic and Atmospheric Administration to assess changes in nitrate concentration between the 1960s and 2000s across the open North Pacific Ocean.
http://www.hawaii.edu/news/2014/12/02/human-activity-impacts-oceans-nitrogen-cycle/
http://www.scienceclarified.com/Mu-Oi/Nitrogen-Cycle.html
http://www.hngn.com/articles/51169/20141201/ocean-nitrates.htm
