Measurements of hydrogen cyanide (HCN) and acetylene (C₂H₂) from the Infrared Atmospheric Sounding Interferometer (IASI)

Valentin Duflot (1) , D. Hurtmans (2) , L. Clarisse (2) , Y. R'Honi (2) , C. Vigouroux (3) , M. de Mazière (3) , E. Mahieu (4) , C. Servais (4) , Cathy Clerbaux (5, 2) , Pierre-François Coheur (2)

1 Équipe Troposphère
2 Spectroscopie de l'atmosphère, Service de Chimie Quantique et Photophysique
3 BIRA-IASB - Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique
4 Institut d'Astrophysique et de Géophysique [Liège]
5 TROPO - LATMOS

Hydrogen cyanide (HCN) and acetylene (C₂H₂) are ubiquitous atmospheric trace gases with medium lifetime, which are frequently used as indicators of combustion sources and as tracers for atmospheric transport and chemistry. Because of their weak infrared absorption, overlapped by the CO₂ Q-branch near 720 cm⁻¹, nadir sounders have up to now failed to measure these gases routinely. Taking into account CO₂ line mixing we provide for the first time extensive measurements of HCN and C₂H₂ total columns at Reunion Island (21° S; 55° E) and Jungfraujoch (46° N; 8° E) in 2009-2010 using observations from the Infrared Atmospheric Sounding Interferometer (IASI). These are compared with local ground-based Fourier Transform InfraRed (FTIR) measurements and we demonstrate that the seasonality is well captured, except for HCN at Jungfraujoch. We also examine a nonspecific biomass burning plume over austral Africa and show that the emission ratios with respect to CO agree with previously reported values.

Domaines: Physique Atmosphérique et Océanique [physics.ao-ph]; Océan, Atmosphère; Sciences de l'environnement

Valentin Duflot, D. Hurtmans, L. Clarisse, Y. R'Honi, C. Vigouroux, et al.. Measurements of hydrogen cyanide (HCN) and acetylene (C₂H₂) from the Infrared Atmospheric Sounding Interferometer (IASI). Atmospheric Measurement Techniques, 2013, 6 (4), pp.917-925. ⟨10.5194/amt-6-917-2013⟩. ⟨hal-00742702⟩