GATS has contributed significantly to the improvement in the data product from the original LIMS data reduction. The most important improvements are:

• The new retrievals also use a greatly improved radiative transfer model developed by GATS.
• Higher Resolution Retrievals: The new retrievals are performed at a spacing of 0.375 km using an interleave methodology. The original retrievals were done on a 1.5 km spacing. Though we are retrieving data on a much finer spacing, the resolution for each point is also improved. Our new product achieves about 2.5 km resolution for temperature, ozone and HNO3 and 4.5 km resolution for H2O and NO2.
• Jitter Reduction: The quality of the LIMS data was reduced because of severe jitter induced by operation of the ERB spacecraft. In the new processing we average up/down radiance pairs to reduce the effects of the jitter and improve the signal apodization.
• All Data Used In The Retrievals: In the original LIMS data analysis, only one scan every 4 degrees in latitude was used and only every 4th point in the Z. In the new effort, all the scans and all the data points are used to achieve both high resolution and reduced uncertainty.
• New Spectral Line Parameters: The line intensities, half widths, etc. for the various species have been improved since the LIMS data was first analyzed. The best available parameters are being used in the current retrievals.
• Attitude Adjustment: The reprocessing software does a scan by scan attitude adjustment to improve the registration of the signals with altitude.
• Additional Interfering Species: The latest version of the retrieval code includes aerosols, freons and CH4 as interfering species.
• Oblateness: The effects of a non-spherical earth have been included.