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London, J.

Publications and source records attributed to London, J..

23 records · Page 2
All sourcesNASA NTRSDOE OSTI
NASA NTRS1977

Satellite observations of the global distribution of stratospheric ozone

Observations of backscattered radiation from an orbiting geophysical observatory (Ogo) satellite for the period September 1967 to February 1968 have been used to determine the global distribution of ozone at different levels in the middle and upper stratosphere (30-55 km). The derived distributions show significant seasonal and geographic variations with important differences indicated between winter and summer hemisphere distributions. The Ogo-derived distributions are compared with other observations (rocket and satellite) and with photochemical calculations. It is suggested that the increased ozone mixing ratio in the high-latitude winter hemisphere can be accounted for by transport processes up to about 40-45 km and by temperature-sensitive chemistry above.

London, J.↗
NASA NTRS1976

Observed and theoretical variations of atmospheric ozone

Results are summarized from three areas of ozone research: (1) continued analysis of the global distribution of total ozone to extend the global ozone atlas to summarize 15 years (1957-72) of ground based observations; (2) analysis of balloon borne ozonesonde observations for Arosa, Switzerland, and Hohenpeissenberg, Germany (GFR); (3) contined processing of the (Orbiting Geophysical Observatory-4) satellite data to complete the analysis of the stratospheric ozone distribution from the available OGO-4 data. Results of the analysis of the total ozone observations indicated that the long term ozone variation have marked regional patterns and tend to alternate with season and hemisphere. It is becoming increasingly clear that these long period changes are associated with large scale variations in the general upper atmosphere circulation patterns.

London, J.↗
NASA NTRS1976

Variations including possible solar cycle variations of stratospheric ozone over central Switzerland

The annual variation of the total amount of ozone over central Switzerland and the partial pressures in each of 7 layers from the surface to 7.8 m zeta shows the pattern representative of mid-latitude ozone: summer maximum in the troposphere, spring maximum in the lower stratosphere up to 30 mb and summer maximum in the middle stratosphere up to approx. mb. It was also shown that at the level of the ozone maximum the ozone partial pressure has a pronounced period of about 26 months. Total ozone and the ozone concentration in the different layers have marginally significant (at plus or minus sigma) correlations with relative sunspot number. The time lag for these correlations is long in the troposphere (about 36 months) but decreases with height to the level of ozone maximum (to about 2 months). A similar analysis of the data derived from the ozonesonde program at Hohenpeissenberg, Germany (GFR) gave completely consistent results with those discussed above.

London, J.↗
NASA NTRS1976

Satellite observations of the global distribution of stratospheric ozone

Observations of backscattered radiation from an Orbiting Geophysical Observatory (OGO) Satellite were used to determine the global distribution of ozone in different layers in the middle and upper stratosphere. The derived distributions show significant seasonal and geographic variations with important differences indicated between winter and summer hemisphere distributions. The OGO derived distributions are compared with other observations (rocket and satellite) and with photochemical calculations. It is suggested that the increased ozone mixing ratio in the high latitude winter hemisphere can be accounted for by transport processes up to about 40-45 km and by the effects of seasonal variations of NOX, HOX and temperature in the region above.

London, J.↗