干旱区生态环境知识资源中心(Arid): Provenance of Aeolian Dust Revealed by (234U/238U) Activity Ratios in Cryoconites From High-Altitude Glaciers in Western China and Its Transport and Settlement Mechanisms

Arid

DOI	10.1029/2023JF007227
	Provenance of Aeolian Dust Revealed by (234U/238U) Activity Ratios in Cryoconites From High-Altitude Glaciers in Western China and Its Transport and Settlement Mechanisms
	Jiao, Xiaoyu; Dong, Zhiwen; Baccolo, Giovanni; Chen, Xuejiao; Qin, Xiang; Shao, Yaping
通讯作者	Dong, ZW
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
ISSN	2169-9003
EISSN	2169-9011
出版年	2023
卷号	128 期号:8
英文摘要	Asian dust has significant impacts on atmospheric systems and global biogeochemical cycles. In this study, we applied the U isotopic method to trace sediments based on their comminuting age, analyzing the uranium isotopes of cryoconite samples from various glaciers in western China, including the Tibetan Plateau (TP) and Tianshan Mountains. We aimed to explore the spatial variability of the (U-234/U-238) activity ratio and residence time, as well as the transport mechanism of the dust cycle in the region. Additionally, we used Nd-Sr isotopes data from our previous work to jointly determine the provenance. Our results indicate that the average (U-234/U-238) activity ratios in southern TP glaciers are higher, with mean range of 0.981-0.993, while those in northeastern TP locations are lower, with mean of 0.974. This suggests a decreasing trend from south to north. In the Tianshan region, the (U-234/U-238) activity ratio is higher in central areas compared to eastern areas, with a mean range of 0.984-0.996, indicating a decreasing trend from west to east. U-Sr-Nd isotopes analysis showed that dust provenance is from multiple sources, including long-range transported and local dust inputs from the glacier basins, mainly originating from the TP surface and central Asian arid regions. Using the end-member mixing model analysis and meteorological data, we interpret that the cryoconite dust in eastern Tianshan and Qilian Mountains comes from a complex mixture of the southern Gobi, northern TP surface dust, and Taklimakan and Alxa arid deserts. In contrast, the glacial dust in southern TP locations originates mainly from the plateau surface dust. Our findings suggest that the uranium isotopes in high-altitude glaciers are primarily influenced by the origins of dust, which are affected by related atmospheric circulation. We also developed a conceptual model to illustrate the complete process of U isotopic fragmentation and migration changes during dust production, transport, and deposition in the TP region.
英文关键词	(U-234???????/U-238) activity ratio long range transported dust provenance and sources central Asian glaciers transport and settlement mechanisms
类型	Article
语种	英语
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:001052610600001
WOS关键词	ALPHA-RECOIL DAMAGE ; SEDIMENT RESIDENCE TIMES ; SR ISOTOPIC COMPOSITION ; U-SERIES NUCLIDES ; TIBETAN PLATEAU ; ICE CORE ; TAKLIMAKAN DESERT ; INTERCONTINENTAL TRANSPORT ; ANTHROPOGENIC AEROSOLS ; SUMMER DUST
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397360
推荐引用方式 GB/T 7714	Jiao, Xiaoyu,Dong, Zhiwen,Baccolo, Giovanni,et al. Provenance of Aeolian Dust Revealed by (234U/238U) Activity Ratios in Cryoconites From High-Altitude Glaciers in Western China and Its Transport and Settlement Mechanisms[J],2023,128(8).
APA	Jiao, Xiaoyu,Dong, Zhiwen,Baccolo, Giovanni,Chen, Xuejiao,Qin, Xiang,&Shao, Yaping.(2023).Provenance of Aeolian Dust Revealed by (234U/238U) Activity Ratios in Cryoconites From High-Altitude Glaciers in Western China and Its Transport and Settlement Mechanisms.JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,128(8).
MLA	Jiao, Xiaoyu,et al."Provenance of Aeolian Dust Revealed by (234U/238U) Activity Ratios in Cryoconites From High-Altitude Glaciers in Western China and Its Transport and Settlement Mechanisms".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 128.8(2023).