气候变化领域集成服务门户(CCPortal): Hf-Nd-Sr isotopic fingerprinting for aeolian dust deposited on glaciers in the northeastern Tibetan Plateau region

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DOI	10.1016/j.gloplacha.2019.03.015
	Hf-Nd-Sr isotopic fingerprinting for aeolian dust deposited on glaciers in the northeastern Tibetan Plateau region
	Wei, Ting; Dong, Zhiwen; Kang, Shichang; Rostami, Masoud; Ulbrich, Sven; Shao, Yaping
发表日期	2019
ISSN	0921-8181
EISSN	1872-6364
卷号	177
英文摘要	This study investigated the isotopic compositions of Hf, Nd, and Sr in aeolian dust deposited in several glacier basins of the northeast Tibetan Plateau in order to trace the source and provenance of long-range transported (LRT) dust in the region. Transmission electron microscope (TEM) and energy dispersive X-ray spectrometer (EDX) measurements and dust size distributions both indicated that LRT dust was dominant in glacier cryoconite and snowpacks. Isotopes of Hf-Nd-Sr exhibited a generally heterogeneous geographic distribution that varied from north to south. The northern sites (e.g. Miaoergou Glacier) in the Tianshan Mountains showed much higher epsilon(Nd) and epsilon(Hf) values, whereas the southern sites (e.g. Yuzhufeng Glacier) in the Kunlun Mountains had lower epsilon(Nd), with the Hf isotope exhibiting two parts: one positive epsilon(Hf) section and one negative epsilon(Hf) section. Lower Sr-87/Sr-86 ratios were apparent in the Miaoergou Glacier compared to other locations. In general, the Miaoergou Glacier had similar Hf-Nd-Sr isotopic compositions to those of southern Mongolian Gobi and Taklimakan Deserts. By contrast, Qilian Mountain locations exhibited similar Hf, Nd, and Sr isotopic compositions to those of the north Tibetan Plateau soil crust and Chinese Gobi Deserts. However, the Yuzhufeng Glacier, located in the hinterland of the Tibetan Plateau, had LRT dust that was derived predominantly from the north Tibetan Plateau desert and surface crust, but also partly from the Taklimakan desert. Compared with Nd-Sr isotopes, Hf-Nd isotopes provided new evidence for LRT dust transport. For example, the Yuzhufeng and Miaoergou Glaciers had similar Hf-Nd isotopes to those of the Taklimakan Desert and Mongolian Gobi, respectively, implying the potential LRT dust source and atmospheric transport routes. The marked spatial differences in LRT dust source were mainly caused by large-scale atmospheric circulation interactions (e.g. the Mongolian High and Westerlies) during spring and summer. Wind stream analysis and MODIS AOD also demonstrated the potential differences in the sources of dust and the routes taken between northern and southern locations. This work provides new evidence and a more complete view of aeolian transport over the northeast Tibetan Plateau region under the current climate.
关键词	Hf-Nd-Sr isotope fingerprints TEM-EDX measurements Dust size distribution LRT dust routes Northeast Tibetan Plateau
学科领域	Physical Geography; Geology
语种	英语
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary
来源期刊	GLOBAL AND PLANETARY CHANGE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/112030
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wei, Ting,Dong, Zhiwen,Kang, Shichang,et al. Hf-Nd-Sr isotopic fingerprinting for aeolian dust deposited on glaciers in the northeastern Tibetan Plateau region[J]. 中国科学院西北生态环境资源研究院,2019,177.
APA	Wei, Ting,Dong, Zhiwen,Kang, Shichang,Rostami, Masoud,Ulbrich, Sven,&Shao, Yaping.(2019).Hf-Nd-Sr isotopic fingerprinting for aeolian dust deposited on glaciers in the northeastern Tibetan Plateau region.GLOBAL AND PLANETARY CHANGE,177.
MLA	Wei, Ting,et al."Hf-Nd-Sr isotopic fingerprinting for aeolian dust deposited on glaciers in the northeastern Tibetan Plateau region".GLOBAL AND PLANETARY CHANGE 177(2019).