Comparisons of topsoil geochemical elements from Northwest China and eastern Tibetan Plateau identify the plateau interior as Tibetan dust source
Comparisons of topsoil geochemical elements from Northwest China and eastern Tibetan Plateau identify the plateau interior as Tibetan dust source
复制标题
西北地区与青藏高原东部表土地球化学元素对比确定高原内部为青藏高原沙尘源
DOI：
10.1016/j.scitotenv.2021.149240
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发表时间：
2021
影响因子：
9.8
通讯作者：
Liu Xiaojing
中科院分区：
文献类型：
--
作者：
Yang Shengli;Luo Yuanlong;Li Qiong;Liu Weiming;Chen Zixuan;Liu Li;Liu Xiaojing
青藏高原高海拔地区是一个潜在的沙尘源，对全球沙尘循环具有重要影响，并可能导致环境变化。青藏高原上的风成黄土是研究沙尘活动历史的珍贵档案。识别TP尘源将加深对粉尘输送和大气环流模式及其环境影响的认识。然而，TP黄土的来源还没有达成共识，这阻碍了对粉尘传输和古环境解释的理解。以中国西北地区和东部TP地区的表土和黄土样品为研究对象，系统研究了TP黄土地球化学组成的空间变异性，并利用TP黄土的元素特征识别了其沙尘源。与中国西北地区相比，东部TP表层土壤和黄土中TiO2、MnO、Cr、Co、Y、Zr、Nb、La、Ce和Hf相对富集，而Na2O、MgO、CaO、Sr和Pb相对亏损。地球化学成分和物源分析表明，柴达木盆地、河西走廊和塔里木盆地的降尘不是TP黄土的主要来源。然而，TP黄土的元素特征大致一致，元素含量与TP上的表层沉积物中的常量和微量元素相似。因此，东部TP黄土主要来自TP内部，揭示了TP作为亚洲重要的粉尘源。
The high-altitude Tibetan Plateau (TP) is a potential substantial source of dust that could have major effects on the global dust cycle and lead to environmental change. Aeolian loess on the TP is a valuable archive for studying the history of dust activities. Identification of TP dust sources will deepen understanding of dust transport and atmospheric circulation patterns and their environmental impacts. However, consensus on the source of TP loess has not been reached, which hinders understanding of dust transport and paleoenvironmental explanations. In this study, topsoil and loess samples from Northwest (NW) China and eastern TP were used to systematically investigate the spatial variability in geochemical composition, and the element characteristics of the TP loess were used to identify its dust source. Compared with samples from NW China, the eastern TP topsoil and loess were relatively enriched in TiO2, MnO, Cr, Co, Y, Zr, Nb, La, Ce, and Hf, but relatively depleted in Na2O, MgO, CaO, Sr, and Pb. The geochemical composition and source analyses indicated that the dust from the Qaidam Basin, Hexi Corridor, and Tarim Basin in NW China was not the main contributing source to the TP loess. However, the elemental characteristics of the TP loess were broadly consistent, and element contents were similar to those of major and trace elements in surface sediments on the TP. Thus, the eastern TP loess was sourced primarily from the TP interior, revealing the TP as an important dust source in Asia.