INTRUSION OF RECENT AIR IN POLAR STRATOSPHERE DURING SUMMER 2009 REVEALED BY BALLOON-BORNE IN SITU CO MEASUREMENTS

Gisèle Krysztofiak (1) , Rémi Thiéblemont (1) , Valéry Catoire (1) , Nathalie Huret (1) , Sébastien Payan (2) , Fabrice Jegou (1) , Marc-Antoine Drouin (1) , C Robert (1)

1 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
2 LPMAA - Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique

The SPIRALE (Spectroscopie Infa-Rouge par Absorption de Lasers Embarqués) balloon-borne instrument has been launched twice within 17 days in the polar region (Kiruna, Sweden, 67.9°N-21.1°E) during summer, at the beginning and at the end of August 2009. In situ measurements of several trace gases have been performed including CO and O 3 between 10 and 34 km height, with very high vertical resolution (~5 m). The both flight results are compared and the CO stratospheric profile of the first flight presents specific structures associated with mid-latitude intrusion in the lowest stratospheric levels. Their interpretation is made with the help of results from several modeling tools (MIMOSA and FLEXTRA) and available satellite data (IASI). We also used the O 3 profile correlated with CO to calculate the proportion of recent air in the polar stratosphere. The results indicate the impact of East Asia urban pollution on the chemistry of polar stratosphere in summer.

Domaines: Océan, Atmosphère; Physique Atmosphérique et Océanique [physics.ao-ph]

Gisèle Krysztofiak, Rémi Thiéblemont, Valéry Catoire, Nathalie Huret, Sébastien Payan, et al.. INTRUSION OF RECENT AIR IN POLAR STRATOSPHERE DURING SUMMER 2009 REVEALED BY BALLOON-BORNE IN SITU CO MEASUREMENTS. 20th ESA Symposium on European Rocket and Balloon Programmes and Related Research, May 2011, Hyères, France. pp.91-98. ⟨insu-01323350⟩