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Article Dans Une Revue Atmospheric Chemistry and Physics Discussions Année : 2014

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

Résumé

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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Dates et versions

hal-01164674 , version 1 (13-04-2015)
hal-01164674 , version 2 (17-06-2015)

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S. Preunkert, Michel Legrand, M. Frey, Alexandre Kukui, Joël E Savarino, et al.. Formaldehyde (HCHO) in air, snow and interstitial air at Concordia (East Antarctic plateau) in summer. Atmospheric Chemistry and Physics Discussions, 2014, 14 (23), pp.32027-32070. ⟨10.5194/acpd-14-32027-2014⟩. ⟨hal-01164674v1⟩
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