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Preunkert , Suzanne; Legrand , Michel; Frey , Markus; Kukui , Alexandre; Savarino , Joël; Gallée , Hubert; King , M.; Jourdain , Bruno; Vicars , William; Helmig , Detlev (2015)
Publisher: European Geosciences Union
Journal: Atmospheric Chemistry and Physics Discussions
Languages: English
Types: Article
Subjects: [ PHYS.PHYS.PHYS-AO-PH ] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [ SDE ] Environmental Sciences, Chemistry, QD1-999, G, Geography. Anthropology. Recreation, [ SDU ] Sciences of the Universe [physics], QC801-809, Geophysics. Cosmic physics, Physics, GE1-350, Environmental sciences, QC1-999
International audience; 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 analyzer. Snow emission fluxes were estimated from vertical gradients of mixing ratios observed at 1 cm and 1 m above the snow surface as well as in interstitial air a few centimeters below the surface and in air just above the snowpack. Typical flux values range between 1 and 2 × 1012 molecules m-2 s-1 at night and 3 and 5 × 1012 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 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. Simulations indicate that the gas-phase production from CH4 oxidation largely contributes (66 %) to the observed HCHO mixing ratios. In addition, HCHO snow emissions account for ∼ 30 % at night and ∼ 10 % at noon to the observed HCHO levels.

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