The Retrieval of Ozone Profile with Polarization

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The Retrieval of Ozone Profile with Polarization

• Guo, Xin
• ESE/Ge152 Final Project
• Mar 16th 2005

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Ozone

• Stratospheric ozone
• Photo chemistry
• Good
• Tropospheric ozone
• Human activities
• Bad

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Huggins Band

• Ozone absorbs ultraviolet radiation in three main
  regions known as the Hartley band, the Huggins
  band and the Chappuis band.
• The Huggins band is a spectral region from 310 -
  350nm

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Retrieval Method

• Problem
• Solution revised Levenberg-Marquardt Method
• Cost Function

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Retrieval Method cont.

• From Modeling
• Generate synthetic spectrum with noise
• Feed the retrieval code with synthetic data and
  try to obtain the original state vector
• Try different SNR
• Comparison between retrieval with and without
  polarization (current stage)
• From Real Data (future work)

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Results SNR1000
Scaled profiles
Number density profiles
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Results SNR1000
Without Polarization
With Polarization
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Results SNR1000
Residual spectra of the retrieved state
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Error Bar
SNR1000
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Information Content Increment
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Conclusion

• Polarization increases the information content
• Polarization improves the retrieval
• We need a polarimeter with sufficient SNR, and a
  super computer, of course, in order to perform
  the retrieval better

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Results SNR400
Without Polarization
With Polarization
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Results SNR400
Without Polarization
With Polarization
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Hardcore SNR100000 !!!
Without Polarization
With Polarization
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Spectrum