The iron records and its sources during 1990-2017 from the Lambert Glacial Basin shallow ice core, East Antarctica
The iron records and its sources during 1990-2017 from the Lambert Glacial Basin shallow ice core, East Antarctica
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1990-2017年东南极洲兰伯特冰川盆地浅冰芯的铁记录及其来源
DOI：
10.1016/j.chemosphere.2020.126399
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发表时间：
2020
期刊：
影响因子：
8.8
通讯作者：
Liu Ke
中科院分区：
文献类型：
--
作者：
Du Zhiheng;Xiao Cunde;Mayewski Paul A.;H;ley Mike J.;Li Chuanjin;Ding Minghu;Liu Jingfeng;Yang Jiao;Liu Ke
在这项研究中，在东南极的兰伯特冰川盆地钻探了一个12.5米的浅冰芯，称为LGB。在这个覆盖1990-2017年间的浅层岩心中，以5-6厘米的分辨率测量了主要离子和金属元素。因此，在这个浅冰芯重建了铁(Fe)浓度和通量的年度分辨率记录。尽管Fe数据与前人的结果具有可比性，但我们的结果强调，与Pinatubo火山事件(1991年6月)相比，Cerro Hudson火山事件(1991年8月)向南极东部冰盖输送的溶解Fe(DFE)要多得多。在1990-2017年间，风尘可能是DFE的主要来源。特别是，DFE的变化可能会受到两个时期(1990-1998年和2014-2017年)生物质燃烧排放的影响。而2000年以来，由于东极洲温度(δ~(18)O)的下降，总溶解铁(TDFe)的变化受控于气候条件。这些铁数据将有助于评估南极冰盖现代生物有效铁的释放。
In this study, a shallow ice core (12.5 m, called LGB) was drilled at the Lambert Glacial Basin, East Antarctica. The major ion and metal elements were measured at 5–6 cm resolution in this shallow core, which covered the period 1990–2017. Therefore, an annual-resolution record of iron (Fe) concentrations and fluxes were reconstructed in this shallow ice core. Although the Fe data is comparable to previous results, our results emphasized that much more dissolved Fe (DFe) from the Cerro Hudson volcanic event (August 1991) was transported to the East Antarctic ice sheet, in comparison with the Pinatubo volcanic event (June 1991). The aeolian dust may be the primary DFe source during 1990–2017. In particular, the DFe variations may be affected by the biomass burning emissions in two periods (1990–1998 and 2014–2017). While total dissolved Fe (TDFe) variations were controlled by the climatic conditions since 2000 because of the temperature (δ18O) decreasing at East Antarctica. These Fe data will be useful to assess the modern bioavailable Fe release for the Antarctica ice sheet.