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CAVIAR Meeting

CAVIAR Meeting. September 2010. Assessment of H 2 O Line Intensities. Assessment of H 2 O Line Intensities. Assessment of H 2 O Line Intensities. Accepted: JMS May 2010 “….compared to HITRAN2008 …. our values are higher by about 15% for intensities…”. HITRAN08 / Oudot. Oudot Example.

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CAVIAR Meeting

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  1. CAVIAR Meeting September 2010

  2. Assessment of H2O Line Intensities

  3. Assessment of H2O Line Intensities

  4. Assessment of H2O Line Intensities Accepted: JMS May 2010 “….compared to HITRAN2008 …. our values are higher by about 15% for intensities…”

  5. HITRAN08 / Oudot

  6. Oudot Example

  7. Average “a” Parameter

  8. Continuum Detection

  9. H2O Continuum Detection • Fit spectral lines to simulation (with no continuum) a τw + b τg+ τaero+ c • a, b, c can vary freely • τaero is obtained from handheld aerosol instrument • c is baseline shift, or continuum absorption

  10. H2O Continuum Detection

  11. H2O Continuum Detection

  12. H2O Continuum Detection

  13. H2O Continuum Detection

  14. H2O Continuum Detection (25 cm-1)

  15. H2O Continuum Detection (1 cm-1)

  16. Conclusions • H2O line intensities consistency analysis • 8000 - 9200 cm-1 spectral region is too weak in HITRAN08 by about 20% • New linelist by Oudot gives underestimation about 3% • Technique for continuum retrieval is currently being developed but initial results are promising • Revised calibration now available • Look for consistently across a number of days • Sensitivity tests to error in profile (e.g 1% ppmv how does retrieved continuum change) • Refine aerosol contribution • Compare retrieved continuum to new CAVIAR laboratory measurements

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