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Outline Objectives Results

Outline Objectives Results. SAOZ at Eureka. Florence Goutail Service d’Aeronomie / CNRS, France. OBJECTIVES. Ozone and NO2 monitoring O3, NO2 Slant columns - One reference spectrum for the whole campaign Converted  Vertical columns - Using an Arctic winter AMF

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Outline Objectives Results

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  1. Outline Objectives Results SAOZ at Eureka Florence Goutail Service d’Aeronomie / CNRS, France Post campaign Meeting - Eureka 2005,- 30 May 2005

  2. OBJECTIVES • Ozone and NO2 monitoring • O3, NO2 Slant columns - One reference spectrum for the whole campaign • Converted  Vertical columns - Using an Arctic winter AMF (from SAOZ balloon profile at 67 °N) - SZA selection: 86 - 91 ° • Ozone loss during winter 2004/05 • Using REPROBUS and/or SLIMCAT 3D CTM Post campaign Meeting - Eureka 2005,- 30 May 2005

  3. Instrument Ground-based SAOZ UV-Visible spectrometerlooking at zenith (270 -620 nm, 1nm resolution) Columns:O3, NO2, ( Color index - clouds) Post campaign Meeting - Eureka 2005,- 30 May 2005

  4. O3 and NO2 AMF Post campaign Meeting - Eureka 2005,- 30 May 2005

  5. O3 and NO2 vertical columns • Ozone: • Large day to day variations • Between day 55 and day 72 difference between morning and evening why? • NO2: • After day 69, more sunlight, NO2 is increasing and diurnal variation is observed Post campaign Meeting - Eureka 2005,- 30 May 2005

  6. Why O3 sunset larger than O3 sunrise ? One explanation could be because Eureka is located at the edge of the vortex. Here is a map of PV at 475K (by Mimosa contour advection model) yellow inside vortex and red outside. Eureka is represented by blue star Mimosa: A. Hauchecorne, CNRS/SA Post campaign Meeting - Eureka 2005,- 30 May 2005

  7. Why O3 sunset larger than O3 sunrise ? As an example: On day 69,March 10, 2005 O3sr = 364 DU O3ss = 439 DU Sunrise: SAOZ is looking toward east that is inside vortex Sunset: SAOZ is looking toward west that is outside vortex Post campaign Meeting - Eureka 2005,- 30 May 2005

  8. Ozone loss during Arctic winter Method: Difference between measurements and passive ozone from a 3D CTM in which ozone is considered as a passive tracer Model 3D CTM (chemical transport model): Reprobus (F. Lefevre) Slimcat (M. Chipperfield, W Feng) Post campaign Meeting - Eureka 2005,- 30 May 2005

  9. Ozone loss above Eureka - Slimcat 3D CTM correctly reproduces day to day variations -A large difference is observed between transported passive Ozone (black) and SAOZ (pink): it is attributed to chemical loss. At the end of winter the difference reach 135 DU= ~25% Post campaign Meeting - Eureka 2005,- 30 May 2005

  10. Eureka (Canada) Zhigansk (CNRS/CAO) Zhigansk (CNRS/CAO) Salekhard (CNRS/CAO) Salekhard (CNRS/CAO) Thule (DMI) Thule (DMI) NyAlesund (NILU) NyAlesund (NILU) Sodankyla (CNRS/FMI) Sodankyla (CNRS/FMI) ScoresbySund (CNRS/DMI) ScoresbySund (CNRS/DMI) Harestua (BIRA) Harestua (BIRA) Comparison to other SAOZ Arctic stations Measurements and associated model data are selected only when the station is located inside vortex. Post campaign Meeting - Eureka 2005,- 30 May 2005

  11. Comparison to other SAOZ stations -Loss above Eureka (green) seems similar to that of other Stations -Cumulative loss at the end of winter: 25% according to Slimcat -with REPROBUS 3D CTM 22% Post campaign Meeting - Eureka 2005,- 30 May 2005

  12. Conclusion • Ozone and NO2 morning and evening vertical columns recorded for the whole campaign. • Ozone loss during winter 2004/05 • above SAOZ stations 25% • at Eureka: 25% -> 135 DU Post campaign Meeting - Eureka 2005,- 30 May 2005

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