Welcome to Mike's Ozone resource Spreadsheet bar graphs, 56N 5W data, NW Europe graphics, comparison with average (dist.gif) and ozone hole value (ho220.gif) were calculated by Mike Trigger mainly using GRaDS for the PC. Ozone values are based on 1 deg TOVS GRIB data. This data was chosen because it estimates Ozone during the polar darkness whereas the available near real time TOMS data requires daylight to obtain O3 values. TOAST data used following demise of TOVS in MAY 2005.
These pages provide links to Ozone data sources and UK UV. O3 values calculated by Mike made use of TOVS data (corrected as shown) until May 2005. From May 2005 TOAST smoothed GRIB data is available but this does not fit well with TOVs - No futher local charts produced.
DATA changes for TOVS: 1 AUGUST 2001 CPC TOVS DATA NOAA14 TO NOAA 16.
This change according to Mike resulted in a decrease in averaged OZONE values by about 3%. TOAST data from May 05 used uncorrected, combines TOVS and backscatter UV data.
TOVS values appeared to be lower than GOME, TOMS and other NOAA sources. The cause may be the method of calculation of the total ozone and possibly related to the NOAA 14 night time cold temperature bias.
The TOVS Total Ozone algorithm was changed June 4, 2003 to eliminate low ozone values caused by cirrus contamination. This change will be most noticable in the tropics (source NOAA).
DATA CHANGE NOAA 16 changed to NOAA 15 in 9 Jan 2005.
Both NOAA 15 and 16 have scan motor problems in AVHRR. TOMS also has problems.MAY 2005 SAT FAILURE TOVS GRIB NOT UPDATED. TOAST GRIB DATA USED FROM APRIL 2006 for UK and Global trend by Mike. OMI replaces TOMS 2006.
NOTE GOME / ERS2 restricted coverage due to on board satellite tape failure.
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KNMI data |
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OMI N Pole link |  |
| WMO 2011 Ozone Bulletins NASA OZONE watch |
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Health Protection Agency UV |
TEMIS home |
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