Climatology and comparison of ozone from ENVISAT/GOMOS and SHADOZ/balloon-sonde observations in the southern tropics

Nahoudha Mzé (1) , Alain Hauchecorne (2) , Hassan Bencherif (1) , Francis Dalaudier (2) , Jean-Loup Bertaux (2)

1 LACy - Laboratoire de l'Atmosphère et des Cyclones
2 STRATO - LATMOS

In this paper, the stellar occultation instrument GOMOS is compared with ozonesondes from the SHADOZ network. We only used nighttime O3 profiles and a requirement selection at 8 Southern Hemisphere stations. 7 years of GOMOS datasets (GOPR 6.0cf and IPF 5.0) and 11 years of balloon-sondes are used in this study. A monthly distribution of GOMOS O3 mixing ratios is performed in the upper-troposphere and in the stratosphere (15-50 km). A comparison with SHADOZ is done in the altitude range from 15 km to 30 km. In the 21-30 km altitude range, a satisfactory agreement is observed between GOMOS and SHADOZ although some differences are observed depending on the station. The range for monthly differences is generally decreasing with increasing height and is within ±15%. It is found that the agreement between GOMOS and SHADOZ degrades below ~20 km. The median differences are nearly within ±5% particularly above 23 km. But a large positive bias is found below 21 km compared to SHADOZ.

Domaines: Physique Atmosphérique et Océanique [physics.ao-ph]

Nahoudha Mzé, Alain Hauchecorne, Hassan Bencherif, Francis Dalaudier, Jean-Loup Bertaux. Climatology and comparison of ozone from ENVISAT/GOMOS and SHADOZ/balloon-sonde observations in the southern tropics. Atmospheric Chemistry and Physics, 2010, 10 (16), pp.8025-8035. ⟨10.5194/acp-10-8025-2010⟩. ⟨hal-00449101⟩