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.
https://hal-insu.archives-ouvertes.fr/insu-01141793
Contributor : Nathalie Pothier <>
Submitted on : Monday, April 13, 2015 - 5:15:47 PM
Last modification on : Tuesday, March 17, 2020 - 2:14:48 AM
Document(s) archivé(s) le : Tuesday, April 18, 2017 - 5:50:45 PM
Contributor : Nathalie Pothier <>
Submitted on : Monday, April 13, 2015 - 5:15:47 PM
Last modification on : Tuesday, March 17, 2020 - 2:14:48 AM
Document(s) archivé(s) le : Tuesday, April 18, 2017 - 5:50:45 PM
File
acpd-14-32027-2014-print.pdf
Publisher files allowed on an open archive
