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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 #d88nov42

"European Sources of Halocarbons and Nitrous Oxide: Update 1986," M. Prather (NASA/GSFC, Inst. Space Studies, 2880 Broadway, New York NY 10025 ), J. Atmos. Chem., 6(4), 375-406, May 1988.

Semi-continuous measurements of CFCl3, CF2Cl2, CCl4, CH3CCl3 and N2O were made at Adrigole, Ireland as part of the Atmospheric Lifetime Experiment (ALE). This paper extends previous work on the relative enhancements of trace gases during pollution episodes and presents 1) unambiguous identification of elevated levels of N2O concurrent with halocarbon pollution events, 2) detection of trends in emission of CH3CCl3, 3) discovery of seasonal variations in emission of CF2Cl2, CCl4 and CH3CCl3, 4) characterization of typical summer and winter pollution episodes, and 5) identification of weather patterns over Europe that are associated with high concentrations of CFCs at Adrigole. The source of nitrous oxide correlated with halocarbons is 0.8 Tg(N)/yr from Europe alone and represents approximately 10% of the global stratospheric loss.

Item #d88nov43

"Antarctic Ozone: Meteoric Control of HNO3," M.J. Prather (Goddard Inst. Space Studies, NASA/GSFC, 2880 Broadway, New York NY 10025), J.M. Rodriguez, Geophys. Res. Letters, 15(1), 1-4, Jan. 1988.

Ablation of meteoroids provides a source of alkalinity for stratospheric aerosols. The largest concentrations of meteoric material in the stratosphere occur in the Antarctic spring in amounts sufficient to neutralize parts per billion of acidic vapor, remove nitric acid from the gas phase and bond it as metal nitrates in the aerosol phase. Removal of nitric acid vapor allows increased catalytic loss from chlorine and bromine. This is a critical link in the photochemical depletion of ozone.

Item #d88nov44

"Comparison of Total Ozone Amounts Derived from Satellite and Ground-Based Measurements," W.G. Planet (Nat. Environ. Satellite, Data & Info. Svc., NOAA), ibid., 5-8.

Presents results of qualitative comparisons of the data sets from TOVS, SBUV and the Dobson systems over the period 1978-1986. The global trends of the data show qualitative agreement until mid-1984, when the data diverge with the TOVS-derived data showing higher values. After 1984 there is a drift apart, especially of the TOVS and SBUV data records, which is clearly evident in the north and south temperate zones. There is overall qualitative agreement between the TOVS measurements and the Dobson data record.

Item #d88nov45

"Isotopic Fractionation in Ozone Decomposition," S.K. Bhattacharya (Dep. Chem., B-017, Univ. Calif., La Jolla CA 92093), M.H. Thiemens, ibid., 9-12.

Provides measurements of the isotopic fractionation during O3 destruction, which complement details previously obtained for the O3 production process. The fractionation magnitude is required for modeling the steady-state isotopic composition of stratospheric ozone.

Item #d88nov46

"Laboratory Studies of Sticking Coefficients and Heterogeneous Reactions Important in the Antarctic Stratosphere," M.T. Leu (MS 183-301 Jet Propulsion Lab., Calif. Inst. Tech., Pasadena CA 91109), ibid., 17-20.

Measured sticking coefficients of H2O, HCl, Cl2 and HNO3 on ice, and heterogeneous reactions of ClONO2 with ice or HCl/ice. With HCl present in ice, the reaction probability of ClONO2 is greatly enhanced, while molecular chlorine was found to be the major gas phase product. Nitric acid, another reaction product, remained in the solid phase. Results should be a major factor in producing observed springtime ozone depletion.

Item #d88nov47

"Airborne Lidar Observations of Arctic Polar Stratospheric Clouds: Indications of Two Distinct Growth Stages," L.R. Poole (NASA Langley Res. Ctr., Atmos. Sci. Div., Hampton VA 23665), M.P. McCormick, ibid., 21-23.

Observations show two distinct PSC growth stages delineated by the frost-point temperature. Results at 2-6 ° K above the frost point indicate a stage of significant particle growth such as proposed in models of PSC formation by co-deposition of HNO3 and H2O vapors. Results near frost point show the formation of larger crystalline particles.

Item #d88nov48

"A Ground-Based Intercomparison of NO, NOx, and NOy Measurement Techniques," F.C. Fehsenfeld (Aeronomy Lab, NOAA, Boulder CO 80307), R.R. Dickerson et al., J. Geophys. Res., 92(D12), 14,710-14,722, Dec. 20, 1987.

Simultaneous atmospheric measurements were made in a field intercomparison of instruments involving two currently employed techniques of NOx and NOy measurement. Conclusions drawn from results are 1) the two NO instruments agreed on NO mixing ratios that were measured during the daytime hours over a range from the limits of detection to 35 ppbv, 2) the two NOy instruments gave similar estimates of NOy in ambient air over a wide range of mixing ratios (0.4-10 ppbv), 3) the ferrous sulfate converter used for NOx detection showed a significant interference from NPN and PAN.

Item #d88nov49

"Atmospheric Infrared Emission of ClONO2 Observed by a Balloon-Borne Fourier Spectrometer," S.T. Massie (NCAR, Boulder CO 80307), J.A. Davidson et al., ibid., 14,806-14,814.

Spectral simulations were used in an analysis incorporating line-by-line calculations and new ClONO2 cross sections to determine the mixing ratios of ClONO2. The inferred mixing ratios of ClONO2 are 1.3 + or - 0.45 ppb and 0.98 + or - 0.35 ppb at 14 and 34 mbar. Comparisons with observations taken near 0300 LT at a latitude of 35 ° N show agreement at 14 mbar, but the ClONO2 mixing ratio at 34 mbar is larger than the model prediction.

Item #d88nov50

Comment and reply on "An Intercomparison of Nitrogen-Containing Species in Nimbus 7 LIMS and SAMS Data," ibid., 14,869.

Item #d88nov51

"An Important Uncertainty in Coupled Chlorine-Carbon Dioxide Studies of Atmospheric Ozone Modification," R.S. Ekman (Dept. Phys., Cambridge Univ., UK), J.D. Haigh, J.A. Pyle, Nature, 329(6140), 616-619, Oct. 15, 1987.

Presents calculations of the effect on stratospheric ozone of increased amounts of CO2 and Cl compounds. Changes in the kinetic data used in the two dimensional model have led to significant differences in the calculated ozone modification. The lower stratosphere now plays a more crucial role in the vertically integrated ozone depletion. Uncertainties in the thermal response of the lower stratosphere may represent a significant limitation in current ability to predict future states of the middle atmosphere.

Item #d88nov52

"Antarctic Stratospheric Chemistry of Chlorine Nitrate, Hydrogen Chloride, and Ice: Release of Active Chlorine," M.J. Molina (Jet Propulsion Lab., Calif. Inst. Tech., Pasadena CA 91109), T-L. Tso et al., Science, 238(4831), 1253-1257, Nov. 27, 1987.

The reaction rate between atmospheric HCl and ClONO2 is greatly enhanced in the presence of ice particles. Cl2 is released into the gas phase in a few milliseconds while HNO3 remains in the condensed phase. This reaction releases photolytically active chlorine from its most abundant reservoir species, promotes the formation of HNO3 and removes NO2 from the gas phase. This establishes the necessary conditions for the efficient catalytic destruction of ozone by halogenated free radicals.

Item #d88nov53

"Reactions of Chlorine Nitrate with Hydrogen Chloride and Water at Antarctic Stratospheric Temperatures," M.A. Tolbert (Chem. Phys. Lab., SRI Internat., Menlo Pk CA 94025), M.J. Rossi et al., ibid., 1258-1260.

Results of laboratory studies of heterogeneous reactions important to ozone depletion, performed on surfaces that simulate polar stratospheric clouds, show that the reaction of ClONO2 on ice and of certain mixtures of HNO3 and ice proceed rapidly. Also nearly all of the HCl in the bulk of the ice can react with ClONO2 on the ice surface. The gaseous products, HOCl, Cl2O and Cl2 could all photolyze to produce active chlorine for ozone depletion. The formation of condensed-phase HNO3 could also serve as a sink for odd nitrogen species that would otherwise scavenge the active chlorine, adding further to ozone depletion.

Item #d88nov54

"Tropospheric Latitudinal Distributions of CF2Cl2, CFCl3, N2O, CH3CCl3 and CCl4 Over the Remote Pacific Ocean," D.C. DeLorey (Lab. Atmos. Res., Washington State Univ., Pullman WA 99164), D.R. Cronn, J.C. Farmer, Atmos. Environ., 22(7), 1481-1494, 1988.

These trace gas latitudinal distributions were used to calculate Northern and Southern Hemisphere mean concentrations, annual time trends, total atmospheric burdens, and lifetimes. Normalizing these hemispheric annual time trends with the October-November 1980 mean hemispheric concentrations shows CH3CCl3 mean hemispheric concentrations increased the fastest at about 9% yr-1, while N2O increased the slowest at about 0.3% yr-1. The October-November 1980 trace gas total atmospheric burdens were: 5.81 Mton for CF2Cl2, 3.95 Mton for CFCl3, 2.47 Mton for CH3CCl3, 3.50 Mton for CCl4, and 2283 Mton for N2O. The atmospheric lifetimes obtained for CF2Cl2, CFCl3 and CH3CCl3 were 174 + or - 89, 202 + or - 149, and 14.5 + or - 2.2 yr, respectively.

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