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

Unknown, Article, Other literature type English OPEN
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: (issn: 1680-7324)
  • Related identifiers: doi: 10.5194/acpd-14-32027-2014, doi: 10.5194/acp-15-6689-2015
  • Subject: [ PHYS.PHYS.PHYS-AO-PH ] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] | [ SDE ] Environmental Sciences | [ SDU ] Sciences of the Universe [physics]

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 × 10<sup>12</sup> molecules m<sup>-2</sup> s<sup>-1</sup> at night and 3 and 5 × 10<sup>12</sup> molecules m<sup>-2</sup> s<sup>-1</sup> 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 CH<sub>4</sub> 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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