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Article

High Resolution Chemical Stratigraphies of Atmospheric Depositions from a 4 m Depth Snow Pit at Dome C (East Antarctica)

1
National Institute for Nuclear Physics (INFN)-Florence Division, 50019 Sesto Fiorentino, Italy
2
Department of Chemistry “Ugo Schiff”, University of Florence, 50019 Sesto Fiorentino, Italy
3
Institute of Polar Sciences, ISP-CNR, 30172 Venice-Mestre, Italy
4
Department of Chemistry and Industrial Chemistry, University of Genoa, 16146 Genoa, Italy
5
Department of Physics and Astronomy, University of Florence, 50019 Sesto Fiorentino, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Paulo Artaxo
Atmosphere 2021, 12(7), 909; https://doi.org/10.3390/atmos12070909
Received: 22 June 2021 / Revised: 9 July 2021 / Accepted: 12 July 2021 / Published: 14 July 2021
(This article belongs to the Special Issue Air Pollution in the Polar Regions: Levels, Sources and Trends)
In this work, we present chemical stratigraphies of two sampling lines collected within a 4 m depth snow pit dug in Dome C during the Antarctic summer Campaign 2017/2018, 12 years after the last reported snow pit. The first sampling line was analyzed for nine anionic and cationic species using Ion Chromatography (IC); the second sampling line was analyzed for seven major elements in an innovative way with Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) after sample pre-concentration, allowing the study of deposition processes of new markers especially related to crustal source. This coupled analysis, besides confirming previous studies, allowed us to investigate the depositions of the last decades at Dome C, enriching the number of the detected chemical markers, and yielding these two techniques complementary for the study of different markers in this kind of matrix. As a result of the dating, the snow layers analyzed covered the last 50 years of snow depositions. The assessment of the accumulation rate, estimated about 9 cm yr−1, was accomplished only for the period 1992–2016, as the eruption of 1992 constituted the only tie-point found in nssSO42− depth profile. Na, the reliable sea salt marker, together with Mg and Sr, mainly arose from marine sources, whereas Ca, Al and Fe originated from crustal inputs. Post-depositional processes occurred on Cl as well as on NO3 and methanesulfonic acid (MSA); compared to the latter, Cl had a more gradual decrease, reporting a threshold at 2.5 m for the post-depositional process completion. For NO3 and MSA, instead, the threshold was shallower, at about 1 m depth, with a loss of 87% for NO3 and of 50% for MSA. View Full-Text
Keywords: dome C; snow pit; ion chromatography; ICP-OES; chemical stratigraphies; post-depositional processes; dating; primary aerosol dome C; snow pit; ion chromatography; ICP-OES; chemical stratigraphies; post-depositional processes; dating; primary aerosol
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MDPI and ACS Style

Caiazzo, L.; Becagli, S.; Bertinetti, S.; Grotti, M.; Nava, S.; Severi, M.; Traversi, R. High Resolution Chemical Stratigraphies of Atmospheric Depositions from a 4 m Depth Snow Pit at Dome C (East Antarctica). Atmosphere 2021, 12, 909. https://doi.org/10.3390/atmos12070909

AMA Style

Caiazzo L, Becagli S, Bertinetti S, Grotti M, Nava S, Severi M, Traversi R. High Resolution Chemical Stratigraphies of Atmospheric Depositions from a 4 m Depth Snow Pit at Dome C (East Antarctica). Atmosphere. 2021; 12(7):909. https://doi.org/10.3390/atmos12070909

Chicago/Turabian Style

Caiazzo, Laura, Silvia Becagli, Stefano Bertinetti, Marco Grotti, Silvia Nava, Mirko Severi, and Rita Traversi. 2021. "High Resolution Chemical Stratigraphies of Atmospheric Depositions from a 4 m Depth Snow Pit at Dome C (East Antarctica)" Atmosphere 12, no. 7: 909. https://doi.org/10.3390/atmos12070909

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