State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China.
State Key Laboratory of Land Surface Processes and Resource Ecology, Beijing Normal University, Beijing, 100875, China.
Environ Pollut. 2019 Jul;250:762-772. doi: 10.1016/j.envpol.2019.04.068. Epub 2019 Apr 20.
To differentiate the source of aeolian dust between the desert sources from Pan-third pole and high mountain glaciers, therefore, we investigated the spatial variability of aeolian dust sources in the Pan-third polar region. The question of whether such changes reflect variable transport pathways from a unique source in the western China area was addressed. That is, the SrNd radiogenic isotope composition of modern desert samples do not support the hypothesis of a single dust provenance at higher elevation mountain glaciers by long-distance transport; regional sources also play a significant role. Based on previous studies and the data from this study, the five isotopic regions were divided, which are controlled by the geological characteristics in western China. The results suggest that mineral dust deposited into the high-mountain glaciers originated from the free ice region because of glacier melting and the physical and chemical erosion of rocks from the surrounding mountains by local wind systems. The Pb isotopic data further demonstrated that natural dust is the source of Pb for the high-mountain glaciers of Pan-third pole. These results provide an exhaustive documentation of the isotopic signature of the regional dust reaching the glacier regions.
为了区分来自泛第三极沙漠源和高山冰川的风尘来源，因此，我们调查了泛第三极地区风尘源的空间变异性。文中探讨了这些变化是否反映了来自中国西部独特源区的可变传输途径的问题。也就是说，现代沙漠样本的 SrNd 放射性同位素组成不支持远距离传输来自高海拔山区冰川单一尘源的假设；区域来源也起着重要作用。基于先前的研究和本研究的数据，划分了五个受中国西部地质特征控制的同位素区。结果表明，由于冰川融化和当地风系对周围山脉岩石的物理和化学侵蚀，沉积到高山冰川中的矿物质粉尘源自自由冰区。铅同位素数据进一步证明，自然尘埃是泛第三极高山冰川铅的来源。这些结果详尽记录了到达冰川地区的区域尘埃的同位素特征。
