Provenance of mineral dust deposited on Antarctica over the last sixty years by strontium isotopic analysis of snow from Dome C

被引：0
|
作者：
Vecchio, Maria Alessia [1 ,2 ]
Costas-Rodriguez, Marta [2 ,3 ]
Caiazzo, Laura [4 ,5 ]
Bruschi, Federica [6 ]
Hobin, Kasper [2 ]
Vanhaecke, Frank [2 ]
Grotti, Marco [1 ]
机构：
[1] Univ Genoa, Dept Chem & Ind Chem, Via Dodecaneso 31, I-16146 Genoa, Italy
[2] Univ Ghent, Dept Chem, Atom & Mass Spectrometry A&MS Res Grp, Campus Sterre,Krijgslaan 281-S12, B-9000 Ghent, Belgium
[3] Univ Vigo, Ctr Invest Marina, Dept Quim Analit & Alimentaria, Grp QA2, Vigo 36310, Spain
[4] Ente Nuove Tecnol Energia & Ambiente, Via Anguillarese 301, I-00123 Rome, Italy
[5] Univ Florence, Dept Chem Ugo Schiff, Via Lastruccia 13, I-50019 Florence, Italy
[6] Univ Perugia, Dept Chem Biol & Biotechnol, Via Elce Sotto 8, I-06123 Perugia, Italy
来源：
ATMOSPHERIC ENVIRONMENT | 2024年 / 338卷
关键词：
Strontium; Isotopic analysis; Snow; Antarctica; Mineral dust; ICE-CORE; EASTERN AUSTRALIA; MULTIPLE SOURCES; VICTORIA LAND; CLIMATE; SYSTEM; EPICA; IRON; SR; VARIABILITY;
D O I：
10.1016/j.atmosenv.2024.120850
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The strontium (Sr) concentration and Sr-87/Sr-86 isotope ratio have been determined in 132 snow pit samples collected at Dome C, on the East Antarctic Plateau, corresponding to the period 1958-2019, and in 12 surface snow samples collected at the same site in 2016-2017. The average Sr concentration was 8.1 +/- 5.7 pg g(-1) (mean +/- SD) in snow pit samples and 10.1 +/- 8.0 pg g(-1) (mean +/- SD) in surface snow, without any significant temporal trend. The Sr-87/Sr-86 isotope ratio showed small variations (<0.15%), with an average Sr-87/Sr-86 value of 0.7094 +/- 0.0010 (mean +/- SD) in snow pit and 0.7103 +/- 0.0004 (mean +/- SD) in surface snow samples. These results seem to suggest that no change in the source(s) of mineral dust has occurred throughout the period investigated. Comparison of the Sr-87/Sr-86 isotope ratio of the snow samples with those of potential source areas suggests that the mineral dust reaching the East Antarctic plateau over the last decades is of a mixed origin, with a contribution from Patagonia and one or more other source(s) having a more radiogenic Sr isotopic signature, with a major fraction coming from South Australia.
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