Formaldehyde (HCHO) in air, snow and interstitial air at Concordia (East Antarctic plateau) in summer

Abstract : During the 2011/12 and 2012/13 austral summers HCHO was investigated for the first time in ambient air, snow, and interstitial air at the Concordia site located near Dome C on the East Antarctic plateau by deploying an Aerolaser AL-4021 analyser. Snow emission fluxes were estimated from vertical gradients of mixing ratios observed between 5 1 cm and 1 m above the snow surface as well as between interstitial air a few cm below the surface and in air just above the snow-pack. Typical flux values range between 1 to 2 × 10 12 molecules m −2 s −1 at night and 3 to 5 × 10 12 molecules m −2 s −1 at noon. Shading experiments suggest that the photochemical HCHO production in the snowpack at Concordia remains negligible compared to temperature-driven air–snow exchanges. At 10 1 m above the snow surface, the observed mean mixing ratio of 130 pptv and its diurnal cycle characterized by a slight decrease around noon are quite well reproduced by 1-D simulations that include snow emissions and gas phase methane oxidation chemistry.
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S. Preunkert, Michel Legrand, M. Frey, Alexandre Kukui, J. Savarino, et al.. Formaldehyde (HCHO) in air, snow and interstitial air at Concordia (East Antarctic plateau) in summer. Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2014, 14 (23), pp.32027-32070. ⟨10.5194/acpd-14-32027-2014⟩. ⟨insu-01141793⟩

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