Total Ozone Thickness 2018

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. Overplot of 2017 (
new!) Uccle and meteoLCD total ozone measurements.
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!)
Ozone Distribution (NH + SH) Global Ozone maps from Environment Canada 
Northern Hemisphere Ozone Map 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
Sky Condition Ozone&NO2
Diekirch 24Mar18 11:34 380.5 many clouds 60.5
Diekirch 06Mar18 13:33 429.4 heavy clouds 59.7
Diekirch 05Mar18 11:42 421.0 hazy 51.5
Diekirch 03Mar18 13:10 408.3 hazy 50.9
Diekirch 28Feb18 12:00 480.3 blue sky 55.7
Diekirch 27Feb18 13:01 460.1 blue sky 63.4
Diekirch 26Feb18 12:29 456.8 some clouds na
Diekirch 25Feb18 12:08 382.4 blue sky 61.3
Diekirch 24Feb18 11:42 334.3 blue sky 63.0
Diekirch 23Feb18 12:28 345.8 blue sky 63.2
Diekirch 20Feb18 11:43 340.3 light haze 43.4
Diekirch 18Feb18 12:04 360.3 blue sky 43.8
Diekirch 16Feb18 12:07 361.5 blue sky 48.6
Diekirch 15Feb18 12:08 361.5 some clouds 42.9
Diekirch 13Feb18 12:11 383.2 blue sky 69.8
Diekirch 12Feb18 11:45 398.3 heavy clouds 69.6
Diekirch 11Feb18 10:36 418.0 heavy clouds 56.0
Diekirch 10Feb18 12:22 432.0 heavy clouds 41.1
Diekirch 08Feb18 12:35 422.1 light haze 52.5
Diekirch 07Feb18 12:10 386.4 heavy clouds 38.4
Diekirch 05Feb18 12:25 381.6 many clouds 41.0
Diekirch 04Feb18 12:01 372.5 many clouds 44.6
Diekirch 03Feb18 12:22 335.1 heavy clouds 51.8
Diekirch 02Feb18 12:58 366.7 heavy clouds 51.7
Diekirch 21Jan18 11:15 329.9 many clouds 56.5
Diekirch 18Jan18 10:36 291.4 many clouds 76.3
Diekirch 16Jan18 11:19 294.6 many clouds 76.2
Diekirch 10Jan18 12:10 333.7 heavy clouds 43.8
Diekirch 09Jan18 13:11 367.8 heavy clouds 20.7
Diekirch 03Jan18 11:09 377.6 heavy clouds na
Diekirch 02Jan18 11:41 355.8 heavy clouds na

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!


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!

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