February 28, 2007
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FROM VOLUME 6, NUMBER 3, MARCH 1993
ANTHROPOGENIC EMISSIONS AND CONTROL: NITROUS OXIDE
Two items from J. Geophys. Res., 97(D13), Sep. 20, 1992:
"Nitrous Oxide from Coal-Fired Power Plants: Experiments in the Plumes,"
M.A.K. Khalil (Dept. Environ. Sci., Oregon Grad. Inst., Beaverton OR 97006),
R.A. Rasmussen, 14,645-14,649. Measurements show there is very little excess N2O
within 100 m of the stack, and provide evidence that N2O is formed further
downwind. Estimates global direct emissions from power plants to be 0.05 tg/yr.
"The Global Sources of Nitrous Oxide," M.A.K. Khalil (addr. immed.
above), R.A. Rasmussen, 14,651-14,660. Uses atmospheric and ice core data to
show that present global anthropogenic emissions are 7 ± 1 tg/yr; natural
sources are about 15 tg/yr. N2O started increasing rapidly only during the last
century, and may be increasing faster in recent years than during the 1970s.
"Effects of Liming and Nitrogen Fertilization on Emissions of CO2
and N2O from a Temperate Forest," R. Brumme (Inst. Soil Sci. & Plant
Nutr., Buesgenweg 2, W-3400, Göttingen, Ger.), F. Beese, J. Geophys.
Res., 97(D12), 12,851-12,858, Aug. 20, 1992.
Flux measurements from experimental plots in a 145-year-old beech forest
show that liming drastically reduced the N2O emission and increased CO2
emission; fertilization increased N2O.
"Emissions of Nitrous Oxide from Combustion Sources," A.N.
Hayhurst (Dept. Chem. Eng., Univ. Cambridge, Cambridge CB2 3RA, UK), A.D.
Lawrence, Progress Energy & Combus. Sci., 18(6), 529-552,
1992. An extensive review with over 100 references, emphasizing fluidized bed
combustion of coal.
"Nitrous Oxide Emissions in Fluidized-Bed Combustion: Fundamental
Chemistry and Combustion Testing," M.D. Mann (Energy Res. Ctr., Univ. N.
Dakota, Grand Forks ND 58202), M.E. Collings, P.E. Botros, ibid., 18(5),
Analyzes factors influencing N2O emissions such as SOx/NOx control,
combustion temperature, and fuel type (wood, peat, lignite, subbituminous and
bituminous coal, petroleum coke). Discusses possible abatement strategies.
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