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ACVT-GBMCD subgroup GOMOS ozone profiles, analysis of comparison with GMBCD datasets (bright/dark, star magnitude, star temperature). Yasjka Meijer, RIVM [email protected] Validation Team O 3 profiles. Validation teamPI-nameInstituteInstrument AO 153S. PalSAAI/MSCLidar

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ACVT-GBMCD subgroup GOMOS ozone profiles, analysis of comparison with GMBCD datasets

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Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

ACVT-GBMCD subgroup

GOMOS ozone profiles, analysis of comparison with GMBCD datasets

(bright/dark, star magnitude, star temperature)

Yasjka Meijer, RIVM

[email protected]


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Validation Team O3 profiles

Validation teamPI-nameInstituteInstrument

  • AO 153S. PalSAAI/MSCLidar

  • AO 158J.-C. LambertBIRAMicrowave/lidar/sondes

  • AO 179A. MatthewsNIWAMicrowave/sondes

  • AO 191T. BlumenstockINTAFTIR

  • AO 300 D. De MuerRMISondes

  • AO 360P. KeckhutCNRSLidar

  • AO 429E. KyroFMISondes

  • AO 1103A. PetritoliISACSondes

  • AO 9003D. SwartRIVMLidar


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Intercomparison of Ozone Profiles

GOMOS data:

  • from ACRI prototype processor

  • added solar zenith angle at tangent point

GBMCD data:

  • collocations provided by AO-teams

  • all files available from NILU database

  • all data converted to ozone number density vs altitude

Geolocation criteria:

  • lidar (< 24 hrs, 1000 km)

  • sonde (< 24 hrs, 1000 km)

  • microwave radiometer (< 4 hrs, 1000 km)


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Geolocation of GOMOS & GBMCD data

  • Total collocated GOMOS-GBMCD

  • paired profiles:226

  • no altitude overlap: - 13

  • missing files GOMOS:- 82

  • available for analysis 131


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Example 1

Lauder lidar


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Example 2

Toronto lidar


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Example 3

Uccle sonde


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Important GOMOS parameters

Sun position (SZA)

  • dark (110o-180o)

  • twilight (90o-110o)

  • bright (0o-90o)

Star magnitude (MV)

  • strong (-2 to 1)

  • weak (1 to 5)

Star temperature (K)

  • hot (7,000-100,000)

  • cold (1,000-7,000)

More straylight

Less signal from weaker stars

Less UV in colder stars


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

LIDAR measurements

vs GOMOS


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Lidar

All data

N = 57


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Lidar

BRIGHT

N = 4


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Lidar

TWILIGHT

N = 13


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Lidar

DARK

N = 40


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Lidar

DARK

STRONG

N = 5


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Lidar

DARK

weak

N = 35


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Lidar

DARK

COLD

N = 19


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Lidar

DARK

HOT

N = 21


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Conclusions vs LIDAR:

  • bright limb ozone profiles: poor results

  • twilight limb ozone profiles: better than bright limb, but still large deviations (cause to be determined)

  • dark limb ozone profiles: good results

    • no systematic biases between 18-45 km

    • no clear influence of star magnitude or temperature


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

SONDE measurements

vs GOMOS


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Sonde

All data

N = 39


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Sonde

BRIGHT

N = 26


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Sonde

DARK

N = 13


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Sonde

Only 1 strong STAR (of 13), with MV<1


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Sonde

DARK

COLD

N = 9


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Sonde

DARK

HOT

N = 4


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Conclusions vs SONDE:

  • bright limb ozone profiles: poor results

  • twilight limb ozone profiles: no cases

  • dark limb ozone profiles: good results

    • small systematic bias of 5-10% between 18-35 km (GOMOS lower)

    • star magnitude: no info

    • star temperature: below 22 km cold better than hot and above vice versa(?, more statistics needed)


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

MICROWAVE measurements

vs GOMOS


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Microwave

Note: lower mesosphere included

All data

N = 35


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Microwave

BRIGHT

N = 23


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Microwave

DARK

N = 12


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Microwave

NO strong STARS, with MV<1


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Microwave

DARK

COLD

N = 4


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Microwave

DARK

HOT

N = 8


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Conclusions vs MICROWAVE:

  • bright limb ozone profiles: poor results

  • twilight limb ozone profiles: no cases

  • dark limb ozone profiles:

    • (all stars) 20-45 km bias within 20%

    • (cold stars) 45-65 km : poor results

    • (hot stars) 45-65 km bias within 20%

    • (hot stars) 45-65 km significant non-random bias suggests possibility for improvement

    • star magnitude: no info


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

All instruments

compared to GOMOS


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

All instruments

All data

N = 131


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

All instruments

BRIGHT

N = 53


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

All instruments

BRIGHT

STRONG

N = 9


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

All instruments

DARK

N = 65


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

All instruments

DARK

STRONG

N = 6


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

All instruments

DARK

weak

N = 59


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

All instruments

DARK

COLD

N = 32


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

All instruments

DARK

HOT

N = 33


Acvt gbmcd subgroup gomos ozone profiles analysis of comparison with gmbcd datasets

Conclusions vs all GBMCD instruments:

  • bright limb ozone profiles:

    • only for bright (MV<1) stars and only above 30 km

    • GOMOS lower by 10 to 15% (30-50 km)

  • twilight limb ozone profiles:

    • needs further research

  • dark limb ozone profiles:

    • star magnitude: no clear influence

    • below 18 km: poor results

    • 18-45 km: bias 5 to 10% (all stars)

    • 45-65 km :  cold stars: poor results

      • hot stars: bias within 20%, significant non-random bias suggests possibility for improvement


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