Fe variation characteristics and sources in snow samples along a traverse from Zhongshan Station to Dome A, East Antarctica.
Fe variation characteristics and sources in snow samples along a traverse from Zhongshan Station to Dome A, East Antarctica.
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DOI：
10.1016/j.scitotenv.2019.04.139
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Z. Du;C. Xiao;M. Handley;P. Mayewski;Chuanjin Li;Shiwei Liu;Xiangyu Ma;Jiao Yang
中科院分区：
文献类型：
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作者：
Z. Du;C. Xiao;M. Handley;P. Mayewski;Chuanjin Li;Shiwei Liu;Xiangyu Ma;Jiao Yang
南大洋中的铁浓度被认为是大气二氧化碳(CO2)中有规律的冰川-间冰期循环的驱动因素。研究了生物有效铁(溶解Fe和总溶解Fe)、主要离子(Na+、K+、Mg~(2+)、Ca~(2+)、Cl-−、NO_3~-、SO_4~(2-)和甲烷磺酸)、重金属元素(锶、铅、钒、钛和镉)和稀土元素(稀土元素)的含量。其中，La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb和Lu)以及2017年1月22日至2月5日沿南极东部中山站至冰穹A导线采集的一系列地表雪样的氧、氢同位素组成(δ18O和δD)。结果反映了南极表面雪铁和其他微量元素在东南极冰盖上的浓度。特别是，使用电感耦合等离子体扇区场质谱(SF-ICPMS)测量了DFE和TDFe的浓度。DFE和TDFe的浓度分布沿该样带呈现三个不同的阶段。首先，随着内陆距离海岸的距离急剧减小，然后随着海拔的升高而略有减小的趋势。最大浓度出现在距海岸450-600 公里处，表明存在不同的潜在气源和/或输送气团。这些变化表明，沿该样带输送生物有效铁的来源和过程有所不同。这些数据对评估南极冰盖生物有效铁的释放是有用的。
Iron concentrations in the Southern Ocean are thought to act as a driver of the regular glacial–interglacial cycles in atmospheric carbon dioxide (CO2). This study presents the concentrations of bioavailable Fe (dissolved Fe (DFe) and total dissolved Fe (TDFe)), major ions (Na+, K+, Mg2+, Ca2+, Cl−,NO3‐,SO42‐and methanesulfonic acid (MSA)), heavy metal elements (Sr, Pb, V, Ti and Cd), and rare earth elements (REEs; specifically, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) and the oxygen and hydrogen isotopic compositions (δ18O and δD) from a series of surface snow samples collected during from January 22 to February 5, 2017 along a traverse from Zhongshan Station to Dome A in East Antarctica. The results reflect the Antarctic surface snow Fe and the other trace element concentrations on the East Antarctica ice sheet. In particular, the DFe and TDFe concentrations were measured using inductively coupled plasma sector field mass spectrometry (SF-ICP-MS). The concentration patterns of DFe and TDFe show three different stages along this transect. First, there is an abrupt decrease with distance inland from the coast and then a slight decreasing trend with increasing elevation. The maximum concentrations were observed at distances of 450–600 km from the coast, indicating that there are different potential sources and/or transporting air masses. The variations show that the sources and processes that deliver bioavailable Fe differ along this transect. These data are useful for assessing bioavailable Fe release from the Antarctic ice sheet.