State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China.
The State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, 100875, China.
Chemosphere. 2020 Jul;251:126399. doi: 10.1016/j.chemosphere.2020.126399. Epub 2020 Mar 4.
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 (δO) decreasing at East Antarctica. These Fe data will be useful to assess the modern bioavailable Fe release for the Antarctica ice sheet.
在这项研究中，在东南极的 Lambert 冰川盆地钻取了一个浅层冰芯（12.5 米，称为 LGB）。在这个浅层核心中，以 5-6 厘米的分辨率测量了主要离子和金属元素，该核心涵盖了 1990-2017 年的时期。因此，在这个浅层冰芯中重建了铁（Fe）浓度和通量的年度分辨率记录。尽管 Fe 数据与之前的结果相当，但我们的结果强调，与 Pinatubo 火山事件（1991 年 6 月）相比，来自 Cerro Hudson 火山事件（1991 年 8 月）的更多溶解态铁（DFe）被输送到东南极冰盖。风成粉尘可能是 1990-2017 年期间 DFe 的主要来源。特别是，DFe 的变化可能受到两个时期（1990-1998 年和 2014-2017 年）生物质燃烧排放的影响。而总溶解铁（TDFe）的变化则受自 2000 年以来的气候条件控制，因为东南极的温度（δO）下降。这些 Fe 数据将有助于评估现代南极冰盖可利用铁的释放量。
