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Mike's Ozone index - uses NOAA TOVS 1 degree grib data AND FROM mAY 2005 TOAST GRIB.
In Novemer 2002 there were data problems with TOVS. On 1st August 2001 the data source changed from NOAA 14 to NOAA 16.
In order to maintain a comparison the NOAA 16 data is increased by 3% (based on the change in average values on change over). This appears to maintain values closer to previus values. A cross check was attempted with TOMS (which also has data problems). FROM 8 Jan 2005 data swicthed to NOAA 15 due scan motor problems with NOAA 16 from which date no data correction applied by me from this date. TOAST data will be uncorrected in first instance but global values look low.
Calculations and graphics prepared using GRaDS for the PC.
Not adjusted Global Average April 2006 = 286 DU
Unadjusted values for 1 Deg GRIB 56N 5W.
Unadjusted Global Average 31/03/2006 = 285 DU
Unadjusted value GRIB 56N 5W 420 DU.
Unadjusted Global Average 28/02/2006 = 279 DU
Unadjusted value GRIB 56N 5W 409 DU.
Unadjusted Global Average 31/01/2006 = 276 DU
Unadjusted value GRIB 56N 5W 336 DU.
Not adjusted Global Average 15 Feb 2005 = 290 DU
Unadjusted values for 1 Deg GRIB 56N 5W.
Adjusted/unadjusted Global Average Jan 2005 = 288 DU
Unadjusted values for 1 Deg GRIB 56N 5W.
Adjusted (+3%) Global Average Dec 2004 = 287 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average Nov 2004 = 286 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average Oct 2004 = 285 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average Sept 2004 = 287 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average August 2004 = 292 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average July 2004 = 296 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average JUNE 2004 = 298 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average May 2004 = 299 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average April 2004 = 298 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average 22 March 2004 = 286 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average Feb 2004 = 294 DU
Adjusted +3% changes over Scotland (56N 5W).
Adjusted (+3%) Global Average Jan 2004 = 290 DU
Adjusted +3% changes over Scotland (56N 5W).
View previous years data for 56N 5W
Ozone hole values are quoted as below 220DU (see WMO ozone).
The graphic below shows ozone units minus 220. Antartic Ozone hole values are zero or less. Areas near or below this value a shaded purple. Data is 1 deg GRIB from the NOAA TOVs system.
Note: This data differs from TOMS and ERS2 at times. Low values over Indonesia were examined and the TOMS and ERS2 data has been confirmed as correct by the sources (personal E mail), however in my view TOVs could be night time/dawn data which is not availble from most other Ozone sources (except soundings). The temperature at 100hPa can be lower than -80C, so that dawn time destruction could be a reason for lower values rather than an error in TOVs data caused by high cloud - as suggested by TOMS.
These comments represent a laymans opion only.
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Has the reduction in CFC's started to take effect OR are there other factors which have led to an increase in Stratospheric Ozone (TOVS) since 1996/easing down again in 1999/Strong recovery in 2001 N Hemi
Comparing recent years S Pole
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