February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 1, NUMBER 6, DECEMBER 1988
"Ancient Carbon Sources of Atmospheric Methane,"
(correspondence), T. Gold, Nature, 335(6188), 404, Sep. 29,
Methane has a far larger greenhouse effect than a similar quantity of carbon
in the form of CO2. The gas-producing industry may be helping to restrain the
greenhouse effect by burning methane to CO2 and water.
"Measurements of Atmospheric Methyl Bromide and Bromoform,"
R.J. Cicerone (NCAR, POB 3000, Boulder CO 80307), L.E. Heidt, W.H. Pollock, J.
Geophys. Res., 93(D4), 3745-3749, Apr. 20, 1988.
Summarizes the results of about 750 measurements of CH3Br and 900
measurements of CHBr3 from ground-level sites in Alaska, Hawaii, Samoa and New
Zealand. Methyl bromide concentrations were typically 10-11 ppt by volume with
no clear indications of temporal increases. Bromoform concentrations were
typically 2-3 ppt, but large seasonal variations were seen at Point Barrow.
"Enhanced Biogenic Emissions of Nitric Oxide and Nitrous Oxide
Following Surface Biomass Burning," I.C. Anderson (NASA Langley Res. Ctr.,
MS 401B, Hampton VA 23665), J.S. Levine et al., ibid., 3893-3898.
For the first time measurements indicate that fires in a natural ecosystem
can result in significantly enhanced biogenic emissions of both N2O and NO from
soils, which persist for at least six months. Enhanced levels of exchangeable
ammonium in the soil also follow a surface burn.
"Diurnal Variation of Nitric Oxide at 32 km: Measurements and
Interpretation," Y. Kondo (Res. Inst. Atmos., Nagoya Univ., Honohara 3-13,
Toyokawa 442, Japan), W.A. Matthews et al., ibid., 93(D3),
2451-2460, Mar. 20, 1988.
Presents the results of the NO and ozone measurements obtained from two
balloon flights at Aire sur l'Adour, France. The observed temporal variation of
NO is interpreted quantitatively in terms of current photochemistry in relation
"Far-Infrared Measurement of Stratospheric Carbon Monoxide,"
M.M. Abbas (Space Sci. Lab., NASA, Huntsville, Alabama), M.J. Glenn et al., Geophys.
Res. Letters, 15(2), 140-143, Feb. 1988.
Presents for the first time the vertical profile of stratospheric CO
obtained from infrared thermal emission spectra. The results of 24.6 + or - 7.6
ppbv at 21 km and 34.4 + or - 10.1 ppbv at 37 km are compared with the remote
sensing and in situ measurements by other groups and with
photochemical-dynamical model calculations.
"Midlatitude ClO Below 22 Km Altitude: Measurements with a New
Aircraft-Borne Instrument," W.H. Brune (Dept. Chem., Harvard Univ.,
Cambridge MA 02138), E.M. Weinstock, J.G. Anderson, ibid., 144-147.
Midlatitude stratospheric ClO was measured for the first time. ClO mixing
ratio increases from less than 0.5 pptv at 16.8 km to 2.0 pptv at 18.3 km and
10.1 pptv at 21 km. As ClO is only a small fraction of the total inorganic
chlorine at these altitudes, concludes that 1) catalytic chlorine chemistry is
not an important odd-oxygen loss mechanism below 22 km in the northern
midlatitudes, as predicted by the photochemical models, and 2) heterogeneous
chemistry does not dramatically perturb the partitioning of inorganic chlorine.
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