Prsentation PowerPoint

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The Odin/SMR Experiment and SMR versus MLS
CO B. Barret, P. Ricaud, E. Leflochmoën Laboratoi
re dAérologie / Observatoire Midi-Pyrénées,
Toulouse, France
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The Odin satellite

• Mini-satellite
• Swedish-led project, France, Canada and Finland
• 50 aeronomy, 50 astronomy
• 250 kg
• Sun synchronous orbit 1800 hour ascending node
• 620 km altitude
• Latitude coverage 83S-83N
• 2 instruments
• Microwave (SMR) 119 and 480-580 GHz
• UV/VIS and IR (OSIRIS) 200-700 nm and 1.27 mm
• Target Molecules
• Ozone, chlorine monoxide, water vapour, daytime
  NO2, N2O, HNO3, Isotopes of H2O and O3, CO
• Launch in Feb. 2001 (START-1)

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SMR instrument setup
541-558 GHz
486-504 GHz
563-581 GHz
547-564 GHz
118-119 GHz
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(No Transcript)
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SMR molecules
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Antarctic Vortex Split 2002
O3
ClO
N2O
N2O
ClO
O3
19-20/09/02
25-26/09/02
1-2/10/02
4-5/10/02
Odin
REPROBUS
Ricaud et al. JGR, 2005
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Antarctic Vortex Split 2002
4-5 October 2002
ClO
N2O
O3
NO2
HNO3
Odin
Reprobus
Ricaud et al. JGR, 2005
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CO in the stratosphere and mesosphere
ACE/SMR CO intercomparison
High lat. NH (03/2004)
High lat. SH (05-2004)
Tropics SH (01-04/2004)
Dupuy et al. GRL, 2004
Jin et al. GRL, 2005
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SMR radiances _at_ 576.4 GHz
Mid-latitude SH 32.7S / 48.2E
High latitude SH 80.9S / 105.2E
2004-25-08
20 km
31 km
42 km
CO 576.268 GHz
O3 576.515 GHz
70 km
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CO _at_ 576.3 GHz
Mid-latitude SH 32.7S / 48.2E
High latitude SH 80.9S / 105.2E
2004-25-08
Res. 6 km
18-90 km
Res. 2 km
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SMR/MLS CO selection of data

• SMR (ref. code version 225)
• Measurement response 0.75
• Good convergence
• MLS (V1.5 L2 data quality and description
  document)
• Status 0 clouds (p
• Precision 0
• Quality 0.05
• Coincidence criteria
• Distance
• Dt

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SMR/MLS CO single profiles
25/26 August 2004
SH/Mid. Lat.
SH/High Lat.
NH/Mid. Lat.
NH/High Lat.
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SMR/MLS CO zonal means
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SMR/MLS CO correlations
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SMR/MLS CO summary

• Mean profiles
• Good agreement from 14.6 to 0.1 hPa
• MLS SMR above 0.1 hPa ? bias up to 100
• MLS very noisy
• MLS has strong permanent negative oscillations
  (tropics and high norhern latitudes)
• Correlations
• High correlations in the upper stratosphere
  (around 6.8 hPa)
• Slope MLS/SMR 1 in this region