Oxygen isotope mass balance of atmospheric nitrate at Dome C, East Antarctica, during the OPALE campaign

J. Savarino 1, 2 W. C. Vicars 3, 4, 1 M. Legrand 2, 1 S. Preunkert 2, 1 Benjamin Jourdain 2, 1 M. M. Frey 5 Alexandre Kukui 6, 7 N. Caillon 2, 1 J. Gil Roca 7
1 Université Grenoble Alpes [Saint Martin d'Hères]
2 LGGE - Laboratoire de glaciologie et géophysique de l'environnement
3 INSTAAR - Institute of Arctic and Alpine Research
4 Colorado Department of Public Health and Environment
5 BAS - British Antarctic Survey
6 TROPO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
7 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
Abstract : Variations in the stable oxygen isotope composition of atmospheric nitrate act as novel tools for studying oxidative processes taking place in the troposphere. They provide both qualitative and quantitative constraints on the pathways determining the fate of atmospheric nitrogen oxides (NO + NO2 = NOx). The unique and distinctive 17O-excess (Δ17O = δ17O − 0.52 × δ18O) of ozone, which is transferred to NOx via oxidation, is a particularly useful isotopic fingerprint in studies of NOx transformations. Constraining the propagation of 17O-excess within the NOx cycle is critical in polar areas where there exists the possibility of extending atmospheric investigations to the glacial/interglacial time scale using deep ice core records of nitrate. Here we present measurements of the comprehensive isotopic composition of atmospheric nitrate collected at Dome C (East Antarctic plateau) during the austral summer of 2011/12. Nitrate isotope analysis has been here combined for the first time with key precursors involved in nitrate production (NOx, O3, OH, HO2, RO2, etc.) and direct observations of the transferrable Δ17O of surface ozone, which was measured at Dome C throughout 2012 using our recently developed analytical approach. Assuming that nitrate is mainly produced in Antarctica in summer through the OH + NO2 pathway and using concurrent measurements of OH and NO2, we calculated a Δ17O signature for nitrate in the order of (21–22 ± 3) ‰. These values are lower than the measured values that ranged between 27 and 31 ‰. This discrepancy between expected and observed Δ17O(NO3−) values suggests the existence of an unknown process that contributes significantly to the atmospheric nitrate budget over this east Antarctic region.
Type de document :
Article dans une revue
Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2015, 15 (17), pp.24041-24083. 〈10.5194/acpd-15-24041-2015〉
Liste complète des métadonnées

Littérature citée [92 références]  Voir  Masquer  Télécharger
https://hal-insu.archives-ouvertes.fr/insu-01194525
Contributeur : Catherine Cardon <>
Soumis le : vendredi 13 mai 2016 - 17:17:35
Dernière modification le : jeudi 7 février 2019 - 17:19:01
Document(s) archivé(s) le : mardi 16 août 2016 - 10:16:16

Fichier

acp-16-2659-2016.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

OSUG | UPMC | UVSQ | LGGE | INSU | UGA | UNIV-ORLEANS | LATMOS | UNIV-PARIS-SACLAY | SORBONNE-UNIVERSITE | OSUC | LPC2E | PSL | OBSPM

Citation

J. Savarino, W. C. Vicars, M. Legrand, S. Preunkert, Benjamin Jourdain, et al.. Oxygen isotope mass balance of atmospheric nitrate at Dome C, East Antarctica, during the OPALE campaign. Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2015, 15 (17), pp.24041-24083. 〈10.5194/acpd-15-24041-2015〉. 〈insu-01194525〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

552

Téléchargements de fichiers

83

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD