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.
2.
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.
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 23Nov21 11:20 297.4 blue sky 70.6
Diekirch 20Nov21 12:37 280.2 many clouds 65.6
Diekirch 11Nov21 12:09 270.0 blue sky 53.4
Diekirch 10Nov21 11:49 283.7 light haze 93.8
Diekirch 09Nov21 12:43 274.4 blue sky 66.8
Diekirch 06Nov21 12:04 249.4 some clouds 57.6
Diekirch 04Nov21 12:40 334.3 heavy clouds 48.9
Diekirch 03Nov21 13:42 325.3 heavy clouds 56.7
Diekirch 02Nov21 12:21 308.0 some clouds 67.5
Diekirch 01Nov21 12:19 304.0 some clouds 82.2
Diekirch 29Oct21 11:04 255.0 light haze 87.2
Diekirch 27Oct21 12:11 239.0 heavy clouds 66.0
Diekirch 26Oct21 11:06 275.1 heavy clouds 73.8
Diekirch 25Oct21 11:06 252.4 light haze 66.9
Diekirch 24Oct21 10:53 252.5 blue sky 57.1
Diekirch 22Oct21 11:29 268.9 some clouds 72.6
Diekirch 21Oct21 11:16 294.2 many clouds 78.2
Diekirch 19Oct21 12:42 236.3 some clouds 62.7
Diekirch 18Okt21 11:15 266.2 very hazy 45.2
Diekirch 17Oct21 11:51 269.9 heavy clouds 79.8
Diekirch 16Oct21 11:18 267.4 blue sky 71.2
Diekirch 15Oct21 11:33 281.6 some clouds 58.9
Diekirch 14Oct21 11:22 269.4 some clouds 81.1
Diekirch 13Oct21 13:03 279.2 many clouds 66.5
Diekirch 11Oct21 11:02 278.5 many clouds 87.0
Diekirch 08Oct21 11:01 247.4 blue sky 90.3
Diekirch 07Oct21 09:27 264.8 many clouds 59.6
Diekirch 05Oct21 11:54 285.4 heavy clouds 74.7
Diekirch 04Oct21 11:16 296.3 heavy clouds 70.8
Diekirch 02Oct21 11:57 273.9 many clouds 69.5
Diekirch 01Oct21 10:22 286.8 many clouds 74.0
Diekirch 30Sep21 10:17 295.5 many clouds 56.0
Diekirch 29Sep21 12:21 286.6 some clouds 94.4
Diekirch 25Sep21 10:48 278.5 blue sky 47.4
Diekirch 23Sep21 10:38 280.9 many clouds 74.6
Diekirch 22Sep21 11:03 277.6 some clouds 97.3
Diekirch 20Sep21 10:01 294.1 many clouds 73.2
Diekirch 19Sep21 11:57 286.0 many clouds 91.4
Diekirch 18Sep21 11:18 275.2 many clouds 112.1
Diekirch 17Sep21 09:25 287.5 some clouds 54.8
Diekirch 14Sep21 09:34 283.4 many clouds 87.2
Diekirch 13Sep21 11:48 270.9 many clouds 134.1
Diekirch 04Sep21 12:34 288.6 blue sky 141.6
Diekirch 03Sep21 12:30 278.1 blue sky 120.9
Diekirch 02Sep21 11:00 299.4 blue sky 122.7
Diekirch 01Sep21 11:00 310.5 many clouds 99.5
Diekirch 31Aug21 11:45 316.8 many clouds 110.4
Diekirch 25Aug21 11:07 301.7 many clouds 116.0
Diekirch 24Aug21 13:00 315.1 many clouds 113.8
Diekirch 23Aug21 11:10 308.0 blue sky 98.8
Diekirch 22Aug21 09:45 315.0 many clouds 67.0
Diekirch 21Aug21 10:05 311.6 some clouds 80.2
Diekirch 16Aug21 11:03 321.2 many clouds 72.3
Diekirch 15Aug21 11:05 300.7 many clouds 86.3
Diekirch 14Aug21 10:50 297.4 some clouds 109.4
Diekirch 13Aug21 12:55 283.1 many clouds 105.8
Diekirch 12Aug21 11:30 303.6 some clouds 114.5
Diekirch 11Aug21 11:40 298.9 many clouds 95.0
Diekirch 09Aug21 10.07 324.2 many clouds 79.4
Diekirch 08Aug21 11:06 345.1 many clouds 71.2
Diekirch 07Aug21 10:30 319.5 many clouds 69.3
Diekirch 06Aug21 10:25 337.4 many clouds 68.1
Diekirch 05Aug21 10:15 337.7 many clouds 89.9
Diekirch 04Aug21 11:40 338.5 many clouds 77.9
Dielirch 28Jul21 10:17 339.2 many clouds 68.8
Diekirch 26Jul21 10:12 350.8 many clouds 90.7
Diekirch 25Jul21 11:10 340.9 many clouds 64.3
Diekirch 24Jul21 12:00 348.0 many clouds 82.0
Diekirch 23Jul21 10:41 308.7 many clouds 135.6
Diekirch 22Jul21 11:15 323.1 many clouds 125.5
Diekirch 21Jul21 12:20 309.9 some clouds 119.2
Diekirch 20Jul21 10:05 306.0 some clouds 98.8
Diekirch 19Jul21 13:38 290.4 some clouds 90.3
Diekirch 17Jul21 12:15 309.8 many clouds 103.3
Diekirch 11Jul21 11:27 311.2 some clouds 78.9
Diekirch 10Jul21 11:22 307.2 heavy clouds 100.2
Diekirch 07Jul21 11:11 330.2 many clouds 88.1
Diekirch 06Jul21 10:12 324.2 heavy clouds 77.0
Diekirch 01Jul21 14:00 325.3 heavy clouds 87.9
Diekirch 28Jun21 11:11 311.5 many clouds 112.9
Diekirch 26Jun21 10:56 324.5 some clouds 108.3
Diekirch 25Jun21 11:26 321.3 light haze 112.23
Diekirch 21Jun21 11:17 318.4 heavy clouds 95.6
Diekirch 20Jun21 11:31 317.4 some clouds 95.3
Diekirch 19Jun21 09:34 308.8 some clouds 105.4
Diekirch 18Jun21 11:40 317.2 some clouds 111.7
Diekirch 17Jun21 11:25 316.3 light haze 147.3
Diekirch 16Jun21 11:19 311.0 some clouds 147.4
Diekirch 15Jun21 10:30 315.8 light haze 160.6
Diekirch 14Jun21 11:17 307.1 blue sky 101.7
Diekirch 13Jun21 11:08 302.5 blue sky 94.6
Diekirch 11Jun21 11:06 303.9 some clouds 109.7
Diekirch 10Jun21 11:17 317.3 some clouds 121.2
Diekirch 09Jun21 12:09 328.3 heavy clouds 107.6
Diekirch 08Jun21 09:57 324.0 heavy clouds 61.2
Diekirch 07Jun21 10:59 323.3 heavy clouds 130.9
Diekirch 02Jun21 10:38 337.4 some clouds 162.8
Diekirch 01Jun21 10:52 326.3 blue sky 145.0
Diekirch 31May21 11:30 317.8 blue sky 126.0
Diekirch 30May21 10:28 332.4 some clouds 105.8
Diekirch 29May21 10:50 347.0 many clouds 112.4
Diekirch 28May21 10:40 328.6 many clouds 85.1
Diekirch 26May21 12:08 392.6 many clouds 88.3
Diekirch 17May21 10:40 368.1 many clouds 48.9
Diekirch 16May21 10:20 374.9 many clouds 53.5
Diekirch 14May21 12:20 358.6 heavy clouds 90.8
Diekirch 12May21 11:19 360.6 many clouds 103.8
Diekirch 09May21 11:33 306.3 blue sky 115.5
Diekirch 08May21 14:10 320.1 very hazy 83.5
Diekirch 07May21 11:03 389.1 some clouds 92.5
Diekirch 05May21 10:12 393.4 some clouds 77.5
Diekirch 04May21 11:27 337.9 heavy clouds 68.6
Diekirch 02May21 11:23 378.9 heavy clouds 94.7
Diekirch 01May21 11:20 356.3 very hazy 99.1
Diekirch 30Apr21 11:04 366.5 very hazy 99.7
Diekirch 29Apr21 11:06 400.3 some clouds 112.6
Diekirch 28Apr21 11:02 362.3 blue sky 125.4
Diekirch 27Apr21 11:13 386.3 blue sky 98.5
Diekirch 26Apr21 10:25 363.4 blue sky 87.5
Diekirch 25Apr21 12:32 293.5 blue sky 99.4
Diekirch 24Apr21 11:06 293.4 light haze 105.1
Diekirch 23Apr21 11:17 326.3 blue sky 89.1
Diekirch 22Apr21 10:31 355.8 light haze 91.2
Diekirch 21Apr21 11:35 333.6 heavy clouds 126.3
Diekirch 20Apr21 10:05 358.5 some clouds 82.2
Diekirch 19Apr21 10:51 394.4 many clouds 78.3
Diekirch 18Apr21 09:18 395.2 some clouds 58.9
Diekirch 17Apr21 11:27 376.5 light haze 91.9
Diekirch 16Apr21 11:07 393.6 heavy clouds 83.7
Diekirch 15Apr21 11:00 437.8 many clouds 91.9
Diekirch 14Apr21 13:17 461.2 heavy clouds 98.5
Diekirch 13Apr21 10:57 427.2 heavy clouds 89.1
Diekirch 12Apr21 12:41 411.7 some clouds 96.2
Diekirch 09Apr21 11:10 366.1 hazy 91.1
Diekirch 08Apr21 12:23 344.8 many clouds 88.3
Diekirch 06Apr21 09:17 420.1 many clouds 78.2
Diekirch 04Apr21 15:19 361.7 light haze 111.1
Diekirch 03Apr21 11:33 362.5 some clouds 109.6
Diekirch 02Apr21 11:07 357.5 blue sky 88.9
Diekirch 01Apr21 11:02 308.8 light haze 133.1
Diekirch 31Mar21 11:14 335.8 blue sky 53.2
Diekirch 30Mar21 11:11 337.8 blue sky 69.0
Diekirch 29Mar21 11:03 333.8 blue sky 52.5
Diekirch 28Mar21 11:21 340.2 many clouds 53.8
Diekirch 27Mar21 11:22 350.6 heavy clouds 41.9
Diekirch 26Mar21 12:07 341.7 heavy clouds 50.5
Diekirch 25Mar21 11:57 353.3 heavy clouds 44.3
Diekirch 24Mar21 12:18 307.9 blue sky 35.1
Diekirch 23Mar21 12:05 336.8 blue sky 36.4
Diekirch 21Mar21 13:41 317.8 heavy clouds 40.6
Diekirch 20Mar21 12:09 334.1 blue sky 39.3
Diekirch 19Mar21 12:07 408.2 heavy clouds 47.1
Diekirch 18Mar21 12:29 372.7 some clouds 41.9
Diekirch 17Mar21 12:10 361.8 many clouds 42.3
Diekirch 15Mar21 11:18 409.4 many clouds 48.9
Diekirch 14Mar21 12:28 440.3 heavy clouds 36.4
Diekirch 13Mar21 11:14 387.7 heavy clouds 54.1
Diekirch 12Mar21 11:17 396.5 heavy clouds 44.8
Diekirch 11Mar21 13:15 304.7 heavy clouds 45.1
Diekirch 10Mar21 12:43 311.1 many clouds 43.8
Diekirch 08Mar21 11:04 368.7 some clouds 37.2
Diekirch 07Mar21 11:28 356.0 blue sky 40.2
Diekirch 06Mar21 11:12 345.7 blue sky 42.4
Diekirch 05Mar21 12:55 318.7 heavy clouds 32.6
Diekirch 04Mar21 14:31 314.6 light haze 37.7
Diekirch 03Mar21 09:11 335.6 hazy 15.6
Diekirch 02Mar21 12:20 339.2 blue sky 30.8
Diekirch 01Mar21 12:01 347.3 blue sky 43.0
Diekirch 28Feb21 11:32 310.3 blue sky 48.3
Diekirch 27Feb21 11:40 277.8 many clouds 52.3
Diekirch 25Feb21 11:53 255.4 light haze 21.5
Diekirch 24Feb21 11:24 260.8 light haze 29.6
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!

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.


Back to Home ............................................Please send all mail to francis.massen@education.lu