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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 #d89may39

"Errors in Grab Sample Measurements of N2O from Combustion Sources," L.J. Muzio (Fossil Energy Res. Corp., 23342C South Pointe, Laguna Hills CA 92653), M.E. Teague et al., JAPCA, 39(3), 287-293, Mar. 1989.

Discovered that storing combustion products containing SO2, NOx and water for periods as short as two hours can lead to the formation of several hundred parts per million of N2O where none originally existed. Questions the validity of the existing data base of N2O emissions from fossil fuel systems obtained from grab sampling techniques, and the role of combustion as a major anthropogenic source of atmospheric N2O.

Item #d89may40

"Meridional and Vertical CO and CH4 Distributions in the Background Troposphere (70° N-60° S; 0-12 km Altitude) from Scientific Aircraft Measurements during the Stratoz III Experiment (June 1984)," A. Marenco (Lab. d'Aerologie (CNRS-LA 354), Univ. Paul Sabatier, 31062 Toulouse Cedex, France), M. Macaigne, S. Prieur, Atmos. Environ., 23(1), 185-200, 1989.

Preliminary results show that the CO and CH4 mixing ratios are higher in the Northern Hemisphere than in the Southern, which reflects the meridional distribution of their sources and the influence of tropospheric chemistry. A prominent CO difference between the two hemispheres is observed in the continental air (NH: 100-200 ppb; SH: 80-90 ppb) while the oceanic air is much more homogeneous (NH: 80-90 ppb; SH: 60-70 ppb). In the case of CH4, a regular decrease is observed between the high latitudes of the Northern Hemisphere and those of the Southern. The CH4 results suggest the possible existence of natural sources in the Southern Hemisphere. There is also evidence in the SH that CH4 is increasing at the rate of 1.2 + or - 0.3 % per year.

Item #d89may41

"Meridional and Vertical Ozone Distribution in the Background Troposphere (70° N-60° S; 0-12 km Altitude) from Scientific Aircraft Measurements during the Stratoz III Experiment (June 1984)," A. Marenco (address immed. above), F. Said, ibid., 201-214.

Initial results indicate significantly higher stratospheric and tropospheric O3 contents in the Northern Hemisphere than in the Southern. The data indicate an important photochemical formation of tropospheric O3 at this time of year, resulting from the anthropogenic pollution of industrialized areas.

Item #d89may42

"Evaluation of an Improved Set of Predictors for Derivation of Total Ozone from TOVS Measurements," J.H. Lienesch (NESDIS, NOAA, Washington, D.C.), J. Atmos. Ocean. Technol., 5(5), 625-630, Oct. 1988.

Evaluates three improvements to the operational regression procedures used at NOAA/NESDIS to derive total ozone. Found that the following improved the accuracy of ozone determination: 1) an additional predictor, 2) substitution of one stratospheric channel for another, and 3) the deletion of isothermal cases from the dependent data sets used to derive regression coefficients.

Item #d89may43

"Retrieving of Vertical Ozone Distribution on the Circulation Effect by Statistical Approach," A.D. Frolov, I.V. Rozenberg, E.V. Dorofeev, Izv. Akad. Nauk SSSR Fiz. Atmos. Okeana, 24(10), 1049-1057, Oct. 1988. In Russian.

Develops an inference method for vertical ozone profiles from Dobson ozone spectrophotometer Umkehr observations. Achieves optimization of the calculation procedure on the basis of optical measurement computer simulations. Compares results of retrieved profiles with ozone-probe data from two American stations.

Item #d89may44

"The Chemistry of the Stratosphere," B.A. Thrush (Dept. Chem., Cambridge Univ., Cambridge, UK), Rep. Prog. Phys. (UK), 51(10), 1341-1371, Oct. 1988.

Considers sources, sinks and interconversion reactions that control the concentrations of trace species in stratospheric chemistry. Discusses the measurement of trace species in the stratosphere as a test of our understanding of atmospheric chemistry and the ozone hole.

Item #d89may45

"Zeeman Modulation Contrasted with Pressure Modulation in Its Use in Measuring Atmospheric NO from the Ground," R.L. McKenzie (Dept. Atmos. Phys., Oxford Univ., Oxford, UK), H.K. Roscoe, Appl. Opt., 27(19), 3988-3993, Oct. 1988.

Found that PMR is better suited than ZMR for measuring NO from the ground. The vertical resolution is 10 km between 10 and 25 km and PMR can measure the total column above 25 km. This is useful in the Antarctic because 10-25 km is the altitude region at which the ozone disappears in the spring.

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