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Traversi R, Becagli S, Brogioni M, Caiazzo L, Ciardini V, Giardi F, Legrand M, Macelloni G, Petkov B, Preunkert S, Scarchilli C, Severi M, Vitale V, Udisti R. Multi-year record of atmospheric and snow surface nitrate in the central Antarctic plateau. CHEMOSPHERE 2017; 172:341-354. [PMID: 28088024 DOI: 10.1016/j.chemosphere.2016.12.143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2016] [Revised: 12/26/2016] [Accepted: 12/28/2016] [Indexed: 06/06/2023]
Abstract
Continuous all year-round samplings of atmospheric aerosol and surface snow at high (daily to 4-day) resolution were carried out at Dome C since 2004-05 to 2013 and nitrate records are here presented. Basing on a larger statistical data set than previous studies, results confirm that nitrate seasonal pattern is characterized by maxima during austral summer for both aerosol and surface snow, occurring in-phase with solar UV irradiance. This temporal pattern is likely due to a combination of nitrate sources and post-depositional processes whose intensity usually enhances during the summer. Moreover, it should be noted that a case study of the synoptic conditions, which took place during a major nitrate event, showed the occurrence of a stratosphere-troposphere exchange. The sampling of both matrices at the same time with high resolution allowed the detection of a an about one-month long recurring lag of summer maxima in snow with respect to aerosol. This result can be explained by deposition and post-deposition processes occurring at the atmosphere-snow interface, such as a net uptake of gaseous nitric acid and a replenishment of the uppermost surface layers driven by a larger temperature gradient in summer. This hypothesis was preliminarily tested by a comparison with surface layers temperature data in the 2012-13 period. The analysis of the relationship between the nitrate concentration in the gas phase and total nitrate obtained at Dome C (2012-13) showed the major role of gaseous HNO3 to the total nitrate budget suggesting the need to further investigate the gas-to-particle conversion processes.
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Affiliation(s)
- R Traversi
- Dept. of Chemistry "Ugo Schiff", University of Florence, Sesto F.no, Florence, Italy
| | - S Becagli
- Dept. of Chemistry "Ugo Schiff", University of Florence, Sesto F.no, Florence, Italy
| | | | - L Caiazzo
- Dept. of Chemistry "Ugo Schiff", University of Florence, Sesto F.no, Florence, Italy
| | - V Ciardini
- ENEA, Laboratory for Observations and Analyses of the earth and Climate (SSPT-PROTER-OAC), Rome
| | - F Giardi
- Dept. of Chemistry "Ugo Schiff", University of Florence, Sesto F.no, Florence, Italy
| | - M Legrand
- Université Grenoble Alpes, CNRS, Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE), Grenoble, France
| | | | | | - S Preunkert
- Université Grenoble Alpes, CNRS, Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE), Grenoble, France
| | - C Scarchilli
- ENEA, Laboratory for Observations and Analyses of the earth and Climate (SSPT-PROTER-OAC), Rome
| | - M Severi
- Dept. of Chemistry "Ugo Schiff", University of Florence, Sesto F.no, Florence, Italy
| | | | - R Udisti
- Dept. of Chemistry "Ugo Schiff", University of Florence, Sesto F.no, Florence, Italy; ISAC-CNR, Bologna, Italy
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Size distributions of atmospheric trace elements at dye 3, Greenland — I. Distribution characteristics and dry deposition velocities. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/0960-1686(93)90311-l] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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