Total Ozone Thickness 1998

file dobson98.html with 1998 data

look at dobson97.html for 1997 data

The complete files with all measurements as they are stored in the Microtops instrument

can be found in the data area under the name of mtopxxyy.dat

The total thickness of the (stratospheric) ozone layer is measured at unspecified, irregular intervals using the handheld Microtops II sensor manufactured by Solar Light Company of Philadelphia. This instrument measures the thickness of the ozone layer by computing the ratios of UVB irradiances measured at three different wavelengths, taking into account the water vapour content of the atmosphere, which is also measured by the instrument.
The measurement results are given in DU (Dobson Unit). 100 DU correspond to a total thickness of 1 mm, if the ozone layer were at a standard atmospheric presssure of 1013.25 [HPa]. Common values are in the 250..350 DU range.
Look for other total ozone measurements at the site of the Adeos Satellite, at the Climate Prediction Center (NOAA) total ozone maps of the whole earth and the polar caps, or at the Royal Meteorological Institute of Belgium which all display near-live or very recent data.

The Adeos spacecraft has been definitively lost since June 30 1997. ADEOS Ozone measurements are not available anymore! Look at the NASA EP site for O3 data!