PROFFIT

PROFFIT (PROFILE FIT) is the retrieval tool used at IMK to analyse the solar absorption spectra measured with high-resolution ground-based FTIR spectrometers. It uses the forward code KOPRA, also developed at IMK.

Various retrieval options are implemented, that can be chosen individually for each gas to be retrieved in a joint fit of several MWs:

• Scaling of a-priori profile
• Tikhonov-Phillips (TP) method
• Optimal Estimation (OE) method
• Scaling of a-priori profile in restricted height regime (used for evaluation of ClO)

The next figure shows an example of an O3 profile retrieved with PROFFIT. The corresponding fit result is shown in data analysis:
 

The averaging kernels show the response of the resulting profile due to a change of the profile at a single height level.
The example for O3 show a sensitive height range of up to 35 km and approx. 4 independent layers:
 

For further details please see proffit.pdf or contact Frank Hase .

Atmospheric Trace Constituents and Remote Sensing  Atmosphärische Spurenstoffe und Fernerkundung