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

IF 4.2 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Environment Pub Date : 2024-09-29 DOI:10.1016/j.atmosenv.2024.120850

Maria Alessia Vecchio , Marta Costas-Rodríguez , Laura Caiazzo , Federica Bruschi , Kasper Hobin , Frank Vanhaecke , Marco Grotti

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Abstract

The strontium (Sr) concentration and ⁸⁷Sr/⁸⁶Sr 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 ⁸⁷Sr/⁸⁶Sr isotope ratio showed small variations (<0.15%), with an average ⁸⁷Sr/⁸⁶Sr 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 ⁸⁷Sr/⁸⁶Sr 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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通过对穹顶 C 的雪进行锶同位素分析了解过去六十年沉积在南极洲的矿物尘埃的来源

研究人员测定了1958-2019年期间在东南极高原圆顶C采集的132个雪坑样本和2016-2017年在同一地点采集的12个表层雪样本中的锶（Sr）浓度和87Sr/86Sr同位素比值。雪坑样品中的平均 Sr 浓度为 8.1 ± 5.7 pg g-1（平均值±标度），表层雪中的平均 Sr 浓度为 10.1 ± 8.0 pg g-1（平均值±标度），没有明显的时间趋势。87Sr/86Sr 同位素比值变化较小（<0.15%），雪坑样品中 87Sr/86Sr 的平均值为 0.7094 ± 0.0010（平均值 ± SD），表层雪样品中 87Sr/86Sr 的平均值为 0.7103 ± 0.0004（平均值 ± SD）。雪样的 87Sr/86Sr 同位素比值与潜在来源地区的 87Sr/86Sr 同位素比值的比较表明，过去几十年中到达南极东部高原的矿物尘埃是混合来源的，其中一部分来自巴塔哥尼亚，另一部分或更多的来源具有更具放射性的 Sr 同位素特征，其中主要部分来自南澳大利亚。

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来源期刊

Atmospheric Environment 环境科学-环境科学

CiteScore

9.40

自引率

8.00%

发文量

458

审稿时长

53 days

期刊介绍： Atmospheric Environment has an open access mirror journal Atmospheric Environment: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Atmospheric Environment is the international journal for scientists in different disciplines related to atmospheric composition and its impacts. The journal publishes scientific articles with atmospheric relevance of emissions and depositions of gaseous and particulate compounds, chemical processes and physical effects in the atmosphere, as well as impacts of the changing atmospheric composition on human health, air quality, climate change, and ecosystems.