February 28, 2007
GCRIO Program Overview
Our extensive collection of documents.
Archives of the
Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 2, NUMBER 7, JULY 1989
"Continuous Infrared Analysis of N2O in Combustion Products,"
T.A. Montgomery (UCI Combustion Lab., Univ. Calif., Irvine CA 92717), G.S.
Samuelsen, L.J. Muzio, JAPCA, 39(5), 721-726, May 1989.
Evaluates a prototype continuous N2O analyzer and studies the N2O emissions
from a pulverized coal-fired boiler. Found the analyzer is capable of measuring
N2O down to a few ppm; N2O levels were substantially lower than levels
previously attributed to such sources. This suggests that N2O levels are not a
substantial fraction of NOx levels, as previously suggested by analysis
techniques that were subject to error.
"Fluxes of N2O at the Sediment-Water and Water-Atmosphere Boundaries
of a Nitrogen-Rich River," H.F. Hemond (Dept. Civil Eng., Mass. Inst.
Technol., Cambridge MA 02139), A.P. Duran, Water Resour. Res., 25(5),
839-846, May 1989.
Fluxes of N2O were measured using a mass-balance approach in a small river
in Massachusetts where it receives wastewater treatment plant effluent. The
observed atmospheric flux averaged 0.25 mg N2O m-2h-1, and was among the highest
reported fluxes for aquatic systems on a per-area basis. The largest fraction of
the N2O released to the atmosphere was produced in the treatment plant per se.
During the cold season, N2O was produced in the river sediment; during the warm
season, the sediment was a sink for N2O.
"Evolutionary Pressures on Planktonic Production of Atmospheric
Sulphur," K. Caldeira (Dept. Appl. Sci., New York Univ., 26 Stuyvesant St.,
New York NY 10003), Nature, 337(6209), 732-734, Feb. 23, 1989.
Calculations of relative evolutionary pressure in models of individual
selection and group selection suggest that neither climate modulation nor
altruism could have been the primary factors in the evolution of mid-ocean DMS
production. Although a DMS/climate feedback loop may have a role in modulating
fluctuations in the earth's climate, mid-ocean DMS production can be explained
by selection on local interactions and not in evolutionary feedbacks from
proposed climate modulation.
"Production of Dimethylsulfonium Propionate and Dimethlsulfide by
Phytoplankton in Estuarine and Coastal Waters," R.L. Iverson (Dept.
Oceanog., Florida State Univ., Tallahassee FL 32306), F.L. Nearhoof, M.O.
Andreae, Limnol. Oceanog., 34(1), 53-67, Jan. 1989.
Determined the concentrations of dimethylsulfide (DMS) and its metabolic
precursor, dimethylsulfonium (DMSP), in water and particulate samples obtained
along transects through Delaware Bay, Chesapeake Bay and Florida's Ochlockonee
Bay. Observed positive correlations between the concentrations of the biogenic
sulfur species and salinity, particularly when the concentrations of the sulfur
compounds were normalized to chlorophyll a as a measure of phytoplankton
biomass. In contrast the sharp increases in chlorophyll a-normalized
biogenic sulfur concentrations from the estuarine to the coastal and shelf
environments were most strongly correlated with differences in the species
composition of the phytoplankton community between environments, and appear to
reflect differences in DMSP production between oceanic,
coccolithophore-dominated communities and estuarine, diatom-dominated
"Processes Involved in Formation and Emission of Methane in Rice
Paddies," H. Schütz (Fraunhofer Inst. für Atmos. Umweltforschung,
Kreuzeckbahnstr. 19, D-8100 Garmisch-Partenkirchen, FRG), W. Seiler, R. Conrad,
Biogeochem., 7(1), 35-53, Jan. 1989.
The seasonal change of the rates of production and emission of methane were
determined under in-situ conditions in an Italian rice paddy in 1985 and
1986. Both production and emission of CH4 increased during the season and
reached a maximum in August. However, the numbers of methanogenic bacteria did
not change. As the rice plants grew and the contribution of plant-mediated CH4
emission increased, the percentage of the produced CH4 which was reoxidized and
thus was not emitted, also increased.
"Effect of Volcanic Eruptions on the Gas Composition of the
Atmosphere," S.G. Zvenigorodskii (Leningrad Geol. Inst., USSR), S.P.
Smyshlyaev, Meteorol. Gidrol., No. 3, 119-123, 1988 (English trans. from
Russian, Sov. Meteorol. Hydrol., No. 3, 1988).
Discusses possible mechanisms of the action of volcanic aerosol clouds on
concentrations of minor gases in the stratosphere. Based on a one-dimensional
photochemical model of the atmosphere, numerical experiments were carried out to
study the effect of heterogeneous reactions at the surface of aerosol particles
of different chemical composition on the balance of ozone and ozone active
components. Shows that the heterogeneous flow of OH radicals at the surface of
sulfate aerosol may be the cause of the generation of local minimums in vertical
profiles of ozone concentration in zones of localization of volcanic aerosol
Guide to Publishers
Index of Abbreviations