Total Ozone Thickness 1999

file: dobson99.html

look at dobson97.html and dobson98.html for 1997 and 1998 data

click here for the meteo_lcd data superposed on the graph of RMI

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

NEW: now with ground (tropospheric) ozone concentrations measured at the same time!

jump straight-on to the data


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!


The coordinates of DIEKIRCH are:
latitude = 4952' North longitude = 610' East altitude = 218 m a.s.l.

also... a first intercomparison between the ozone measurements of the Microtops II and those made by the Brewer instrument at the RMI at Uccle!

Location Date UTC Time Thickness
[DU]
Sky Condition Ground ozone
[ug/m3]
Diekirch 20 Dec 99 11:37 291.8 many clouds 33
Diekirch 19 Dec 99 11:52 293.3 some clouds 45
Diekirch 16 Dec 99 12:30 354.9 light clouds 25
Diekirch 14 Dec 99 11:56 384.4 many clouds 58
Diekirch 04 Dec 99 11:53 325.8 blue with clouds 61
Diekirch 02 Dec 99 12:28 235.9 many clouds 57
Diekirch 15 Nov 99 12:21 276.6 blue sky 47
Diekirch 19 Oct 99 11:37 302.5 blue sky 54
Diekirch 18 Oct 99 11:00 295.9 blue sky 39
Diekirch 17 Oct 99 12:05 289.5 blue sky 68
Diekirch 13 Oct 99 10:35 294.0 blue sky 139
Diekirch 05 Oct 99 10:46 334.8 heavy clouds 101
Diekirch 04 Oct 99 11:15 342.1 some clouds 112
Diekirch 30 Sep 99 13:50 305.6 heavy clouds 72
Diekirch 23 Sep 99 11:35 293.2 blue sky with clouds 74
Diekirch 18 Sep 99 12:16 294.3 blue sky with clouds 68
Diekirch 11 Sep 99 12:20 306.7 blue sky 145
Diekirch 18 Jul 99 11:13 362.2 many clouds 101
Diekirch 17 Jul 99 12:05 397.5 blue, some haze 140
Diekirch 09 Jul 99 11:13 362.2 many clouds 101
Microtops II sensor back to Solar Light for recalibration
Diekirch 26 Feb 99 11:55 268.9 blue sky 42
Diekirch 25 Feb 99 12:38 307.3 blue sky 65.4
Diekirch 14 Feb 99 12:50 329.8 blue sky 78.6
Diekirch 11 Feb 99 12:08 423.9 many clouds 60.0
Diekirch 10 Feb 99 11:50 459.6 hazy, some clouds 45.3
Diekirch 09 Feb 99 12:12 458.3 many clouds 65.4
Diekirch 31 Jan 99 13:10 346.8 light haze 66.3
Diekirch 30 Jan 99 13:06 345.5 many clouds 49.1
Diekirch 27 Jan 99 12:23 373.1 many clouds 59.3
Diekirch 20 Jan 99 11:55 280.8 blue sky 19.3
Diekirch 19 Jan 99 12:10 276.9 light haze 42.7
Diekirch 12 Jan 99 11.45 335.0 hazy 31.8