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! |
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. |
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 |