Trend of Ozone in the Free Troposphere above Europe

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,