New tool differentiates between man-made and natural nitrogen-oxide pollutionMarch 26th, 2009 - 3:13 pm ICT by ANI
Washington, March 26 (ANI): Scientists have used a new tool to differentiate between man-made and natural nitrogen oxide emissions.
Nitrogen oxides in the atmosphere, which are produced by lightning, biomass burning, and soil outgassing, are converted into atmospheric nitrate through oxidation reactions.
Nitrogen oxide, itself a pollutant, controls the production of ozone, which in turn is a greenhouse gas and a pollutant at ground levels.
Atmospheric nitrate contributes to the load of atmospheric particulate matter and, along with sulfate, to acid rain.
Despite efforts to regulate and monitor emissions, nitrogen oxide and atmospheric nitrate burdens in the atmosphere are increasing in many regions.
To learn more, S. Morin and his team from Institut National des Sciences de l’Univers, CNRS, Grenoble, France, studied the stable isotopic composition of nitrate within aerosol samples.
These samples were collected along a shipborne transect, in the lower atmosphere over the Atlantic Ocean from 65 degrees South to 79 degrees North.
The researchers found that in nonpolar regions, nitrate derived from anthropogenically emitted nitrogen oxide had isotopic properties distinct from locations influenced by natural nitrogen oxide sources.
Further, air masses exposed to snow-covered areas have low nitrogen isotopic ratios, showing that snowpack emissions of nitrogen oxide from upwind regions can have a significant effect on the local surface budget of reactive nitrogen. (ANI)
- Global waterways fuelling growth of greenhouse gas nitrous oxide - Dec 21, 2010
- Fertiliser use spikes greenhouse gas - Apr 03, 2012
- China to cut 40 percent emission by 2015 - Feb 01, 2012
- Biochar may help suppress greenhouse gases - Mar 19, 2011
- Humans are disrupting the nitrogen cycle, say scientists - Jun 05, 2009
- Ocean acidification alters nitrogen cycling in world seas - Dec 21, 2010
- Beijing to shut polluting industries - May 10, 2012
- Excess light at night can contribute to air pollution: Study - Dec 16, 2010
- Volcanic eruptions in North America were more explosive in the past - Jun 17, 2010
- Court notice to centre on diesel-run vehicles (Lead) - Jul 20, 2012
- Delhi Metro gets UN certificate for reducing pollution - Sep 25, 2011
- Slashing meat intake vital for curbing emissions - Apr 16, 2012
- Chinese vehicles emitted 52 mn tonnes of pollutants - Dec 20, 2011
- Aircraft pollution 'to kill 8,000 people this year' - Sep 30, 2010
- Dental plaques help decode ancient diets - May 06, 2012
Tags: acid rain, aerosol samples, air masses, atlantic ocean, atmospheric particulate matter, burdens, cnrs, greenhouse gas, grenoble france, isotopic ratios, morin, nitrate, nitrogen oxide emissions, nitrogen oxides, outgassing, oxidation reactions, ozone, pollutant, stable isotopic composition, transect