Prsentation PowerPoint

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SMR versus MLS N2O B. Barret, P. Ricaud, E. Le
Flochmoën Laboratoire dAérologie / Observatoire
Midi-Pyrénées, Toulouse, France
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SMR radiances _at_ 501.8 GHz
Urban et al., JGR, 2005
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N2O _at_ 502.3 GHz
30.4N/346.1E
78.4S/143.8E
13-55 km
2 km
Urban et al., JGR, 2005
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SMR N2O validation
Satellites Envisat/MIPAS
Balloons/Aircrafts
Within 10-15 ppbv
Within 10 (vmr gt 15ppbv)
Urban et al., JGR, 2005
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SMR N2O /MLS selection of data

• SMR (ref. code version 222)
• Measurement response gt 0.75
• Good convergence
• MLS (V1.5 L2 data quality and description
  document)
• Status 0 clouds (p lt 100 hPa)
• Precision gt 0
• Quality gt 2.5
• Coincidence criteria
• Distance lt 500 km
• Dt lt 6 hours

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SMR N2O /MLS zonal means
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SMR N2O /MLS correlations
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SMR N2O /MLS summary

• Mean profiles
• Excellent agreement from 68.1 to 1 hPa
• MLS gt SMR below 68.1 hPa ? bias up to 60 at 147
  hPa
• MLS lt SMR above 68.1 hPa ? 10-15
• SMR noisier than MLS
• Correlations
• R gt 0.75 from 68.1 to 3.2 hPa
• Slope MLS/SMR gt 0.8 from 31.6 to 3.1 hPa