Total Ozone Thickness 2023

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.
2. New: Overplot of 2022 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.
Click here for .xls file of same-day values of meteoLCD and Uccle's Website (irregular updates!)
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 = 49°52' North 
longitude = 6°10'
altitude = 218 m a.s.l. 		click to enlarge!
 
Location Date UTC Time Thickness [DU] Sky Condition Ozone&NO2 [ug/m3] **
Diekirch 04Jun23 12:53 351.7 blue sky 128.3
Diekirch 30May23 12:32 323.5 blue sky 120.9
Diekirch 28May23 12:30 338.5 blue sky 123.6
Diekirch 27May23 12:43 344.3 blue sky 108.8
Diekirch 25May23 10:18 346.1 blue sky 87.4
Diekirch 24May23 10:24 379.0 blue sky 80.0
Diekirch 22May23 10:30 328.3 some clouds 86.3
Diekirch 19May23 11:20 355.7 some clouds 97.4
Diekirch 18May23 11:11 350.2 blue sky 88.6
Diekirch 17May23 13:18 359.9 some clouds 91.8
Diekirch 16May23 11:19 351.3 heavy clouds 76.3
Diekirch 15May23 11:04 355.7 some clouds 122.7
Diekirch 14May23 8.55 351.7 blue sky 77.5
Diekirch 13May23 11:03 357.3 some clouds 107.6
Diekirch 12May23 13:10 330.5 many clouds 78.5
Diekirch 08May23 11:07 329.7 some clouds 87.6
Diekirch 07May23 11:16 334.1 heavy clouds 100.2
Diekirch 05May23 12:07 358.2 heavy clouds 76.6
Diekirch 04May23 11:20 340.0 light haze 103.6
Diekirch 03May23 11:28 339.5 blue sky 93.4
Diekirch 02May23 10:30 351.2 many clouds 76.0
Diekirch 30Apr23 10:04 317.7 many clouds 89.2
Diekirch 27Apr23 11:30 320.8 hazy 70.9
Diekirch 26Apr23 11:21 333.3 many clouds 78.1
Diekirch 25Apr23 11:19 378.0 heavy clouds 77.4
Diekirch 24Apr23 14:37 362.6 heavy clouds 83.7
Diekirch 20Apr23 12:33 390.0 many clouds 80.3
Diekirch 18Apr23 11:28 391.5 many clouds 73.0
Diekirch 16Apr23 12:12 377.3 many clouds 54.1
Diekirch 14Apr23 10:15 386.3 some clouds 80.3
Diekirch 12Apr23 11:30 354.9 many clouds 69.8
Diekirch 11Apr23 10:25 343.3 many clouds 82.0
Diekirch 09Apr23 09:30 364.2 many clouds 44.4
Diekirch 04Apr23 12:35 352.2 many clouds 73.3
Diekirch 03Apr23 11:35 383.8 many clouds 79.3
Diekirch 31Mar23 10:50 367.3 heavy clouds 76.7
Diekirch 30Mar23 11:33 337.1 many clouds 92.2
Diekirch 29Mar23 10:56 327.1 many clouds 54.7
Diekirch 28Mar23 11:12 340.2 some clouds 73.3
Diekirch 27Mar23 10:08 368.3 many clouds 71.2
Diekirch 26Mar23 11:13 381.2 many clouds 88.6
Diekirch 25Mar23 12:08 350.1 some clouds 84.4
Diekirch 24Mar23 11:02 328.3 some clouds 93.8
Diekirch 22Mar23 12:02 319.9 heavy clouds 82.7
Diekirch 18Mar23 13:06 346.9 heavy clouds 70.0
Diekirch 17Mar23 12:48 325.7 heavy clouds 74.5
Diekirch 16Mar23 12:01 327.2 light haze 75.8
Diekirch 15Mar23 12:30 358.6 many clouds 72.7
Diekirch 14Mar23 11:07 362.8 heavy clouds 73.3
Diekirch 11Mar23 12:08 376.8 many clouds 66.4
Diekirch 07Mar23 13:18 393.4 heavy clouds 53.1
Diekirch 03Mar23 12:05 352.6 blue sky 55.0
Diekirch 02Mar23 12:03 368.7 blue sky 61.9
Diekirch 01Mar23 12:01 329.4 blue sky 66.7
Diekirch 28Feb23 12:42 312.9 many clouds 56.9
Diekirch 27Feb23 11:02 336.5 blue sky 64.7
Diekirch 24Feb23 11:30 365.3 blue sky 67.4
Diekirch 22Feb23 11:02 323.5 some clouds 54.3
Diekirch 21Feb23 10:43 319.5 blue sky 29.5
Diekirch 20Feb23 10:45 288.2 some clouds 64.0
Diekirch 15Feb23 12:07 272.1 many clouds 30.2
Diekirch 14Feb23 14:35 230.4 many clouds 48.5
Diekirch 13Feb23 11:28 225.6 some clouds 53.9
Diekirch 10Feb23 15:00 233.3 hazy 52.2
Diekirch 09Feb23 12:51 296.9 light haze 49.2
Diekirch 08Feb23 10:49 280.0 blue sky 54.1
Diekirch 07Feb23 12:27 256.9 blue sky 53.6
Diekirch 06Feb23 11:59 266.3 blue sky 63.9
Diekirch 05Feb23 10:45 323.8 many clouds 74.1
Diekirch 02Feb23 12:59 318.5 heavy clouds 69.6
Diekirch 01Feb23 12:44 334.5 heavy clouds 72.1
Diekirch 30Jan23 12:08 264.9 some clouds 47.4
Diekirch 29Jan23 12:10 272.1 light haze 38.9
Diekirch 21Jan23 12:36 370.6 light haze 59.7
Diekirch 18Jan23 12:16 465.2 light haze 48.4
Diekirch 17Jan23 11:16 399.1 some clouds 57.6
Diekirch 15Jan23 09:54 371.7 many clouds 83.3
Diekirch 13Jan23 10:31 342.1 many clouds 83.6
Diekirch 11Jan23 14:00 295.8 heavy clouds 81.9
Diekirch 05Jan23 12:53 298.1 many clouds 73.3
Diekirch 03Jan23 12:23 370.4 many clouds 73.8

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!

Attention:

1. Starting 01-Apr-2021 a new calibration factor of 0.9466 is applied to #3012 measurements by Mike Zimmer. This new factor is the result of a comparison made from 08 to 23 March 2021. #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!

(**)  Ground ozone:
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.
Update 01-Apr-2021: The calibration factor used in the logger has been changed to 1/0.6656 and the offset to -27.8 (see the NEWS from 31-Mar-2021). This will apply to all readings from 01-Apr-2021 on.

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