Total Ozone Thickness

Location	Date	UTC Time	Thickness [DU]	Sky Condition	Ground ozone [ug/m³]
Diekirch	18Mar10	12:08	336.2	light haze	62.0
Diekirch	17Mar10	12:05	351.7	very hazy	62.2
Diekirch	13Mar10	12:29	402.8	light haze	51.4
Diekirch	12Mar10	12:30	402.8	many clouds	54.4
Diekirch	10Mar10	12:07	377.0	light haze	70.4
Diekirch	09Mar10	12:29	384.6	blue sky	69.2
Diekirch	08Mar10	12:26	409.1	blue sky	63.7
Diekirch	07Mar10	12:29	437.8	blue sky	60.7
Diekirch	06Mar10	13:17	437.1	heavy clouds	47.6
Diekirch	05Mar10	12:34	416.0	many clouds	69.5
Diekirch	03Mar10	12:18	398.2	light haze	58.6
Diekirch	02Mar10	12:32	407.7	many clouds	67.5
Diekirch	01Mar10	12:23	376.0	many clouds	57.9
Diekirch	27Feb10	12:25	367.7	some clouds	69.6
Diekirch	18Feb10	11:40	346.0	some clouds	NA
Diekirch	16Feb10	11:50	305.7	blue sky	114.1
Diekirch	13Feb10	11:22	357.4	heavy clouds	35.4
Diekirch	10Feb10	12:04	396.2	some clouds	55.6
Diekirch	08Feb10	12:48	381.5	very hazy	41.6
Diekirch	04Feb10	12:21	316.7	very hazy	23.8
Diekirch	01Feb10	12:14	344.8	many clouds	47.3
Diekirch	31Jan10	12:46	319.2	many clouds	56.7
Diekirch	27Jan10	11:48	285.3	some clouds	43.3
Diekirch	17Jan10	12:02	340.6	many clouds	48.0
Diekirch	14Jan10	11:20	350.8	heavy clouds	18.8
Diekirch	08Jan10	12:48	364.7	heavy clouds	28.7
Diekirch	04Jan10	12:53	334.5	some clouds	30.3
Diekirch	02Jan10	12:53	405.6	many clouds	34.8

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: blue lines correspond to measurements done using instrument #3012 (operator Mike Zimmer). The data in the table are the original readings multiplied by the calibration factor 0.908658 (new calibrated instrument_5375 = 0.908658*instrument_3012) . Comparison tests made from 15Sep to 02Oct 2009.

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.

Attention: dark green lines correspond to measurements done using instrument #3012 (operator Mike Zimmer) starting 19th Nov 09. The data in the table are the original readings multiplied by the calibration factor 0.9087
(instrument_5375 ~ 0.9087*instrument_3012) . Comparison tests made during Sep and Oct 2009.

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

Total Ozone Thickness 2010