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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2010

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Microorganisms in Dry Polar Snow Are Involved in the Exchanges of Reactive Nitrogen Species with the Atmosphere

Anno di pubblicazione: 2010

Formato: Elettronico

Autori: Amoroso A. (1); Domine F. (2,3); Esposito G. (1); Morin S.(2,3,4); Savarino J. (2,3); Nardino M. (5); Montagnoli M. (1); Bonneville J.M.(3,6); Clement J.C. (3,6); Ianniello A. (1); Beine H.J (1,7);

Affiliazioni autori: 1) CNR-IIA; 2) Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS; 3) Université Joseph Fourier-Grenoble 1; 4) CNR-IBIMET; 5) Laboratoire d'Ecologie Alpine, CNRS; 6) Present address:Météo-France/CNRS,CNRM-GAME,CEN, Saint Martin d'Hères, France; 7) Present address: Department of Land, Water & Air Resources, University of California, Davis, CA;

Autori CNR:


Lingua: inglese

Abstract: The snowpack is a complex photochemical reactor that emits a wide variety of reactive molecules to the atmosphere. In particular, the photolysis of nitrate ions, NO(3)(-), produces NO, NO(2), and HONO, which affects the oxidative capacity of the atmosphere. We report measurements in the European High Arctic where we observed for the first time emissions of NO, NO(2), and HONO by the seasonal snowpack in winter, in the complete or near-complete absence of sunlight and in the absence of melting. We also detected unusually high concentrations of nitrite ions, NO(2)(-), in the snow. These results suggest that microbial activity in the snowpack is responsible for the observed emissions. Isotopic analysis of NO(2)(-) and NO(3)(-) in tie snow confirm that these ions, at least in part do not have an atmospheric origin and are most likely produced by the microbial oxidation of NH(4)(+) coming from clay minerals into NO(2)(-) and NO(3)(-). These metabolic pathways also produce NO. Subsequent dark abiotic reactions lead to NO(2) and HONO production. The snow cover is therefore not only an active photochemical reactor but also a biogeochemical reactor active in the cycling of nitrogen and it can affect atmospheric composition all year round.

Pagine da: 714

Pagine a: 719

Pagine totali: 6


Environmental science & technology American Chemical Society,
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 0013-936X

Numero volume: 44

Numero fascicolo: 2

DOI: 10.1021/es902730

Referee: Sì: Internazionale

Indicizzato da: ISI Web of Science (WOS) [000273433200029]

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