Total Ozone Thickness 2021

jump straight-on to the data

Look here: 1. Intercomparison between the ozone measurements of the Microtops II and those made by the Brewer instruments at the RMI at Uccle: 2017, 2016, 2012, 2011, previous years.
New: Overplot of 2020 readings at Uccle and meteoLCD
3. 3D plot of total ozone column for latitude region [45 to 50] from 1964 to 2007 and  maps of all of meteoLCD measurements (from WOUDC, many years missing!)
4. Older dobson files are in the data archive

other near-live or very recent total ozone data:
Thickness of the ozone layer at Uccle Measured by the Royal Meteorological Institute (RMI) of Belgium; shows mean and variance of all data from 1971 on (link has changed again!)
Ozone Distribution (NH + SH) Global Ozone maps from NASA
Northern Hemisphere Ozone Map (not available) Ozone map generated from all Northern Hemisphere stations by the WOUDC

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

Location Date UTC Time Thickness [DU] Sky Condition Ozone&NO2 [ug/m3] **
Diekirch 23Feb21 12:06 301.2 light haze 47.4
Diekirch 22Feb21 12:55 277.9 hazy 24.9
Diekirch 21Feb21 12:21 281.4 blue sky 62.5
Diekirch 20Feb21 12:19 282.5 light haze 52.5
Diekirch 19Feb21 11:48 325.3 heavy clouds 38.4
Diekirch 16Feb21 14:10 300.0 heavy clouds 28.0
Diekirch 15Feb21 13:38 310.3 heavy clouds 13.5
Diekirch 14Feb21 11:36 334.8 blue sky 33.9
Diekirch 12Feb21 12:17 324.5 blue sky 41.1
Diekirch 11Feb21 12:07 318.0 many clouds 38.4
Diekirch 10Feb21 12:18 329.3 blue sky 39.9
Diekirch 04Feb21 12:06 336.2 many clouds 50.1
Diekirch 03Feb21 13:28 358.2 heavy clouds 60.4
Diekirch 02Feb21 12:30 324.3 heavy clouds 35.1
Diekirch 29Jan21 11:52 382.8 heavy clouds 58.1
Diekirch 26Jan21 12:44 329.0 heavy clouds 41.1
Diekirch 24Jan21 10:41 368.0 many clouds 43.3
Diekirch 22Jan21 12:09 325.1 heavy clouds 47.7
Diekirch 21Jan21 12:46 291.3 heavy clouds 49.9
Diekirch 20Jan21 12:52 271.3 some clouds 38.8
Diekirch 17Jan21 12:10 333.0 heavy clouds 33.8
Diekirch 15Jan21 11:57 295.9 some clouds 32.7
Diekirch 13Jan21 12:43 262.8 many clouds 43.5
Diekirch 11Jan21 12:28 264.3 hazy 23.8
Diekirch 09Jan21 12:36 294.4 many clouds 28.8

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; the water vapour content of the atmosphere and the AOT (aerosol optical thickness) are 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 pressure of 1013.25 [HPa]. Common values are in the 250..350 DU range.

The previous years dobsonyy.html files and the Microtops measurement files can be found in the data area!


1. Starting 01-May-2020 a new calibration factor of 0.9321 is applied to #3012 measurements by Mike Zimmer. This new factor is the result of a comparison made from 18 to 26 April 2020. #3012 readings multiplied by this factor are given in blue.

2. Green DU's correspond to a new calibration factor of 0.9422 applied to #3012 measurements by Mike Zimmer starting 02Jun16 ! This new calibration factor has been found by a new comparison over several measurements made from March to July 2016.

Starting 15 Sep 2009, Microtops #5375 is back from calibration at Mauna Loa. Purple data correspond to the new calibrated readings. There is a big difference between the readings before and after calibration. For some time, measurements will be made with both Microtops, and a conclusion drawn thereafter.

Green ground ozone data should be considered unreliable!

(**) The O3&NO2 concentration is given for the actual temperature and pressure conditions. It is NOT corrected for STP conditions! As the NO2 concentrations is practically negligible (below the sensor threshold of 40 ug/m3, the readings should be taken as O3 concentration.

The "old" CAIRSENS O3&NO2 has been replaced by a new model the 15th May 2020. This new Cairsens seems to have a strong positive bias. As our O3 values are very close to those measured by the official station at Beckerich (confirmed by several comparisons), a calibration function will be applied in the datalogger starting 1st July. Correct_O3 = 1.074*reading - 36.309. This function as been applied to all the ground ozone values from 16 May to 29 June (numbers in red) which have not been corrected by the logger. Please read the NEWS from 1 July 20 for the various graphs.

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