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Global Climate Change DigestArchives of the
Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999



Item #d94jul77

"Nitric and Nitrous Oxide Emissions and Soil Nitrate Distribution in a Center-Pivot-Irrigated Cornfield," W.D. Guenzi, G.L. Hutchinson (USDA ARS, POB E, Ft. Collins CO 80522), W.E. Beard, J. Environ. Qual., 23(3), 483-487, May-June 1994.

Field data suggest that, when the size and frequency of irrigations are efficiently managed, use of a low energy precision application (LEPA) irrigation system results in no nitrogen loss to groundwater and no significant loss of NO and N2O to the atmosphere.

Item #d94jul78

"Past and Projected Carbon Dioxide Emissions Due to Energy Utilization in Turkey," M. Tiris (Tubitak-Marmara Res. Ctr., POB 21, Gebze 41470, Kocaeli, Turkey), E. Alper, Energy, 19(4), 499-500, Apr. 1994.

Estimates long-term (1950-2010) CO2 emissions due to fossil-fuel and biomass burning, using energy consumption, energy-demand projections and emission data.

Item #d94jul79

"Trend of Methane Emission to the Atmosphere from Indian Coal Mining," B.D. Banerjee (Cent. Mining Res. Sta., Barwa Rd., Dhanbad-826001, India), A.K. Singh et al., Atmos. Environ., 28(7), 1351-1352, Apr. 1994.

Estimates that emissions from coal production increased from 0.06 to 0.40 million tons between 1951 and 1991, and may increase to 0.60 million tons by 2000.

Item #d94jul80

"Global Increase of SF6 Observed in the Atmosphere," M. Maiss (Inst. Umweltphys., Univ. Heidelberg, Neuenheimer Feld 366, D-69120 Heidelberg, Ger.), I. Levin, Geophys. Res. Lett., 21(7), 569-572, Apr. 1, 1994.

The global mean level of the anthropogenic gas SF6 increased from 0.03 pptv in 1970 to 2.8 pptv in 1992. A modeled atmospheric budget history leads to an extrapolated SF6 concentration of about 20 pptv for 2030.

Item #d94jul81

"Modeling Nitrous Oxide Emissions from Agriculture: A Florida Case Study," C. Li (Inst. Study Earth, Oceans & Space, Univ. New Hampshire, Durham NH 03824), S.E. Frolking et al., Chemosphere, 28(7), 1401-1415, 1994.

Applies the DNDC (denitrification-decomposition) model to agricultural lands in Florida, a state with significant agriculture on both organic and mineral soils. Such process-oriented biogeochemical models will be critical to developing an integrated framework to assess policies for reducing N2O emissions.

Item #d94jul82

"Greenhouse Gas Emissions from Hydroelectric Reservoirs," L.P. Rosa (Energy Planning Prog., COPPE, Univ. Fed. Rio de Janeiro, CP 68565, Cidade Univ., Ilha do Fundo, 21945-970 Rio de Janeiro, Brazil),R. Schaeffer, Ambio, 23(2), 164-165, Mar. 1994.

Comment on a paper by Rudd et al. (Ambio, 22(4), 1993). Agrees that hydroelectric reservoirs may be significant sources of greenhouse gases, but for the cases studied hydroelectricity would be better than thermal power generation with respect to global warming.

Item #d94jul83

"Origins and Variations of Fluoride in Greenland Precipitation," M. De Angelis (Lab. Glac. & Geophys. l'Environ., CNRS, Domaine Univ., BP 96, 38402 St.-Martin-d'Heres Cedex, France), M. Legrand, J. Geophys. Res., 99(D1), 1157-1172, Jan. 20, 1994.

A profile of fluoride levels for the last 27,000 years suggests that anthropogenic sources have dominated the fluoride budget for the last three decades. CFC degradation has been a possible source over the last 10 years, and it may be an increasingly significant part of anthropogenic fluoride input relative to coal burning.

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