file dobson97.html with 1997 data
look at dobson98.html for 1998 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!
| latitude = 49°52' North | longitude = 6°10' East | altitude = 218 m a.s.l. |
| NEW: | 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 in DU | Sky Condition |
| Diekirch | 13 Dec 97 | 12:25 | 278.3 | hazy |
| Diekirch | 05 Dec 97 | 11:22 | 289.9 | light haze |
| Diekirch | 29 Nov 97 | 12:21 | 298.8 | hazy clouds |
| Diekirch | 26 Nov 97 | 12:03 | 282.8 | partially cloudy, light haze |
| Diekirch | 25 Nov 97 | 12:35 | 299.5 | strong haze |
| Diekirch | 19 Nov 97 | 11:22 | 273.6 | blue sky, light haze |
| Diekirch | 17 Nov 97 | 11:45 | 281.1 | blue sky, light haze |
| Diekirch | 08 Nov 97 | 11:32 | 276.9 | many clouds, blue patches |
| Diekirch | 23 Oct 97 | 12:08 | 258.7 | blue sky |
| Diekirch | 22 Oct 97 | 11:21 | 271.6 | blue sky |
| Diekirch | 21 Oct 97 | 11:20 | 286.0 | blue sky with hazy clouds |
| Diekirch | 19 Oct 97 | 13:32 | 292.4 | blue sky |
| Diekirch | 18 Oct 97 | 12:05 | 277.4 | blue sky |
| Diekirch | 12 Oct 97 | 09:50 | 287.8 | blue sky with clouds |
| Diekirch | 10 Oct 97 | 14:21 | 266.2 | blue sky |
| Diekirch | 07 Oct 97 | 11:07 | 281.9 | blue sky with heavy clouds |
| Diekirch | 06 Oct 97 | 10:45 | 262.7 | sun with light haze |
| Diekirch | 05 Oct 97 | 13:57 | 245.5 | light haze |
| Diekirch | 04 Oct 97 | 11:15 | 262.9 | sun with heavy clouds |
| Diekirch | 01 Oct 97 | 12:05 | 269.3 | blue sky with many clouds |
| Diekirch | 30 Sep 97 | 12:10 | 253 | hazy cloud-cover, take results w. caution! |
| Diekirch | 27 Sep 97 | 12:10 | 268 | blue sky |
| Diekirch | 23 Sep 97 | 11:16 | 300 | blue sky |
| Diekirch | 20 Sep 97 | 12:00 | 281 | blue sky |
| Diekirch | 16 Sep 97 | 12:00 | 307 | blue sky with some clouds |
| Diekirch | 15 Sep 97 | 11:45 | 303 | blue sky with some haze |
| Diekirch | 14 Sep 97 | 10:25 | 315 | blue sky with heavy clouds |
| Diekirch | 10 Sep 97 | 12:00 | 263 | blue sky with some haze |
| Diekirch | 08 Sep 97 | 15:00 | 263 | blue sky |
| Diekirch | 01 Sep 97 | 11:55 | 291 | blue sky with some clouds |
| Diekirch | 19 July 97 | 12:13 | 361 | many clouds |
| Diekirch | 16 July 97 | 12:00 | 323 | many clouds, slight haze |
| Diekirch | 13 July 97 | 12:00 | 335 | Blue sky, clouds, slight haze |
| Diekirch | 04 July 97 | 11:57 | 353 | heavy clouds, blue patches |
| Diekirch | 28 June 97 | 12:55 | 353 | clouds, only a few blue patches |
| Diekirch | 19 June 97 | 10:15 | 352 | many clouds |
| Diekirch | 18 June 97 | 14:45 | 338 | patchy blue with many clouds |
| Diekirch | 18 June 97 | 07:40 | 379 | blue sky, very light haze |
| Diekirch | 16 June 97 | 11:30 | 338 | blue sky, some hazy clouds |
| Diekirch | 13 June 97 | 12:00 | 333 | A few blue patches, many clouds |
| Diekirch | 10 June 97 | 12:20 | 329 | blue sky with a few clouds |
| Diekirch | 05 June 97 | 12:05 | 335 | blue sky with some clouds |
| Diekirch | 04 June 97 | 12:15 | 357 | blue sky with large cumuli |
| Diekirch | 31 May 97 | 12:00 | 356 | blue sky, very slight partial haze |
| Diekirch | 30 May 97 | 09:50 | 340 | blue sky, slight haze |
| Diekirch | 27 May 97 | 14:05 | 327 | blue sky with many clouds |
| Diekirch | 15 May 97 | 11:58 | 360 | blue sky, some very slight hazy clouds |
| Diekirch | 03 May 97 | 11:42 | 315 | blue sky, no clouds |
| Diekirch | 02 May 97 | 13:22 | 282 | blue sky, no clouds |
| Diekirch | 24 April 97 | 12:42 | 335 | blue sky with hazy clouds |
| Diekirch | 21 Apri 97 | 12:06 | 327 | blue sky, very few clouds |
| Diekirch | 17 April 97 | 11:43 | 374 | blue sky, some clouds |
| Diekirch | 27 March 97 | 12:07 | 301 | blue sky, many clouds |
| Diekirch | 22 March 97 | 12:19 | 360 | blue sky |
| Diekirch | 12 March 97 | 12:11 | 290 | blue sky, slight haze, sunny |
| Diekirch | 11 Mar 97 | 12:02 | 287 | clear blue sky, sunny |
| Diekirch | 10 Mar 97 | 12:03 | 278 | clear blue sky, sunny |
| Diekirch | 09 Mar 97 | 09:35 | 303 | clear blue sky, sunny |
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