Prsentation PowerPoint

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Validation des mesures OSIRIS / ODIN à partir
des mesures SAOZ
Ariane Bazureau Service dAéronomie /
CNRS Verrières le Buisson
Réunion Validation ODIN Bordeaux, 21-22 Mars
2002
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SAOZ Spectrométrie dAbsorption par Observation
Zénithale

• UV-Visible spectrometer (3 versions)
• Standard (270 -620 nm, 1nm resolution)
• O3, NO2, O4, O2, OClO, Trop. H2O, extinction.
• GPS PTU Vaisala sensor (Z, T, P)

• Vertical profiles of O3, NO2 and aerosols
• Tropospheric O4, H2O
• Satellite validation/ comparison
• ODIN
• ENVISAT
• POAM III

Réunion Validation ODIN Bordeaux, 21 22 Mars
2002
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SAOZ Remote Sensing

• Light source Sun

• Profile during balloon
• ASCENT / evening
• DESCENT / morning

• Profile from constant float
• SUNSET / evening
• SUNRISE / morning

Réunion Validation ODIN Bordeaux, 21 22 Mars
2002
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OSIRIS / ODIN 22 Août 2001 Hémisphère Nord
OSIRIS / ODIN
Kiruna / SAOZ
POAM III / SPOT 4
Coïncidence Distance POAM / SAOZ 822
km Distance ODIN/ SAOZ 400 km
Réunion Validation ODIN Bordeaux, 21 22 Mars
2002
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Région dobservation
Réunion Validation ODIN Bordeaux, 21 22 Mars
2002
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Conclusion

• Altitude registration no shift
• Relative difference ODIN vs SAOZ
• Relative difference ODIN vs POAM

Relative difference Sunset -13.3 in 12
26 km range Sunrise -16.5 in 12 22 km
range

ODIN vs POAM -9.4 in 12 26 km range ODIN
vs POAM -32.4 above 26 km
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Validation des mesures SMR / ODIN à partir des
mesures de POAM III
Ariane Bazureau Service dAéronomie /
CNRS Verrières le Buisson
Réunion Validation ODIN Bordeaux, 21-22 Mars
2002
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POAM III Polar Ozone and Aerosol Measurements

• Launched on SPOT 4 satellite (CNES) on March 1998
• Heliosynchronous quasi-polar orbit HN (sunrise)
  HS (sunset)
• 14 profiles/ day in each hemisphere (at the same
  latitude)
• Between 55 72 N varying with season
• Solar occultation technique in UV- visible band
• Providing data since April 1998

between 354 and 1018 nm

• Degradation of azimuth drive motors
• New operationnal mode alternate between
• Sunrise and sunset occultation on a daily basis
• 14 profiles in N.H. every 2 days
• 14 profiles in S.H. every 2 days

Réunion Validation ODIN Bordeaux, 21 22 Mars
2002
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POAM III Polar Ozone and Aerosol Measurements

• O3 10-60 km altitude range
• 1 km vertical resolution.
• 7- 10 (14- 30 km)
• 15 above and below
• NO2 20 45 km altitude range
• 1.5 to 2.5 vertical resolution
• 5 (20 40 km)
• H2O 15 45 km altitude range
• 5 to 8 (15-45 km)

Compared with sondes, aircraft, balloon Lumpe et
al., 1997 Deniel et al., 1997
Chappuis 603 nm
Compared with HALOE, balloons Randall et al.,
2000 http//wvms.nrl.navy.mil/solve/valid/valid.ht
ml
439.6 nm
Compared with HALOE http//wvms.nrl.navy.mil/solve
/valid/valid.html
Réunion Validation ODIN Bordeaux, 21 22 Mars
2002
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SMR / ODIN 5 Août 2001 Hémisphère Nord
Moyenne des latitudes des mesures POAM III
Réunion Validation ODIN Bordeaux, 21 22 Mars
2002
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SMR / ODIN 5 Août 2001 Hémisphère Sud
Moyenne des latitudes des mesures POAM III
Réunion Validation ODIN Bordeaux, 21 22 Mars
2002
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Conclusion

• Altitude registration slight shift
• South hemispheric conditions strong
  perturbations which reflect on SMR profiles
  obtained.
• difficulties to have a definitive conclusion
• Relative difference SMR 501.6 GHz vs POAM
• Relative difference SMR 544.6 GHz vs POAM

H.N. H.S. 20 - 40 km range 1.3
-15 above 40 km -32. -
H.N. H.S. 20 - 40 km range -22.8 32
below 20 km -18.1 -
Réunion Validation ODIN Bordeaux, 21 22 Mars
2002