Dynamic recycling of gaseous elemental mercury in the boundary layer of the Antarctic Plateau - Archive ouverte HAL Access content directly
Journal Articles Atmospheric Chemistry and Physics Year : 2012

Dynamic recycling of gaseous elemental mercury in the boundary layer of the Antarctic Plateau

(1) , (1) , (1) , (2) , (1) , (1)
1
2

Abstract

Gaseous elemental mercury (Hg0) was investigated in the troposphere and in the interstitial air extracted from the snow at Dome Concordia station (alt. 3320 m) on the Antarctic Plateau during January 2009. Measurements and modeling studies showed evidence of a very dynamic and daily cycling of Hg0 inside the mixing layer with a range of values from 0.2 ng m−3 up to 2.3 ng m−3. During low solar irradiation periods, fast Hg0 oxidation processes in a confined layer were suspected. Unexpectedly high Hg0 concentrations for such a remote place were measured under higher solar irradiation due to snow photochemistry. We suggest that a daily cycling of reemission/oxidation occurs during summer within the mixing layer at Dome Concordia. Hg0 concentrations showed a negative correlation with ozone mixing ratios, which contrasts with atmospheric mer- cury depletion events observed during the Arctic spring. Un- like previous Antarctic studies, we think that atmospheric Hg0 removal may not be the result of advection processes. The daily and dramatic Hg0 losses could be a consequence of surface or snow induced oxidation pathways. It remains however unclear whether halogens are involved. The cycling of other oxidants should be investigated together with Hg species in order to clarify the complex reactivity on the Antarctic plateau.
Fichier principal
Vignette du fichier
acp-12-11027-2012.pdf (653.55 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

insu-00843620 , version 1 (11-07-2013)

Identifiers

Cite

A. Dommergue, M. Barret, J. Courteaud, P. Cristofanelli, C. P. Ferrari, et al.. Dynamic recycling of gaseous elemental mercury in the boundary layer of the Antarctic Plateau. Atmospheric Chemistry and Physics, 2012, 12, pp.11027- 11036. ⟨10.5194/acp-12-11027-2012⟩. ⟨insu-00843620⟩
46 View
137 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More