Total Ozone Thickness 2019

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: Plots of 2018 Uccle and meteoLCD total ozone measurements: series and calibration factor (Brewer MKIII_178 and Microtops 5375, same day direct sun measurements (180 days)
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
[ug/m3] **
Diekirch 15Feb19 12:03 279.5 blue sky 44.6
Diekirch 14Feb19 11:43 267.2 blue sky 40.2
Diekirch 13Feb19 14:05 262.6 very hazy 55.6
Diekirch 12Feb19 12:29 300.5 many clouds 40.9
Diekirch 11Feb19 11:03 427.9 many clouds 75.7
Diekirch 07Feb19 11:51 373.3 heavy clouds 71.5
Diekirch 06Feb19 12:47 276.3 hazy 55.8
Diekirch 04Feb19 12:12 344.4 hazy 41.7
Diekirch 03Feb19 10:33 368.5 many clouds 57.4
Diekirch 31Jan19 13:33 327.0 heavy clouds 67.2
Diekirch 29Jan19 12:10 324.8 heavy clouds 67.2
Diekirch 28Jan19 11:37 351.0 heavy clouds 73.8
Diekirch 21Jan19 12:14 339.9 blue sky 42.7
Diekirch 20Jan19 10:02 353.4 blue sky 36.9
Diekirch 19Jan19 12:00 337.4 blue sky 62.5
Diekirch 18Jan19 13:58 344.3 many clouds 76.2
Diekirch 17Jan19 11:10 309.4 heavy clouds 76.1
Diekirch 16Jan19 13:12 270.7 heavy clouds 72.7
Diekirch 14Jan19 11:50 299.2 heavy clouds 82.3
Diekirch 03Jan19 12:59 283.8 many clouds 71.2

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!

(**) The O3&NO2 concentration is given for the actual temperature and pressure conditions. It is NOT corrected for STP conditions!

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