Ozone observation were made one century ago by the Schoenbein technique at meteorological observatories in the alpine region.Within the intrinsic limitations of the technique,historical readings have been converted to present-time concentrations(ppbv). The evalueted ozone level in the free trposphere(17 ppbv) was twice as large as at the surface;comparable values were obtained by chemical and spectroscopic techniques in the first half of our century.Furthermore,the reconstrued ozone trend in the free troposphere shows a sharp increase after the '50s,as already observed at the surface at mid-latitudes of the northern hemisphere.
ANFOSSI Domenico;
1995-03-15
JRC11416
https://publications.jrc.ec.europa.eu/repository/handle/JRC11416,
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