气候变化领域集成服务门户(CCPortal): Insight Into Radio-Isotope I-129 Deposition in Fresh Snow at a Remote Glacier Basin of Northeast Tibetan Plateau, China

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DOI	10.1029/2018GL078480
	Insight Into Radio-Isotope I-129 Deposition in Fresh Snow at a Remote Glacier Basin of Northeast Tibetan Plateau, China
	Dong, Zhiwen; Shao, Yaping; Qin, Dahe; Zhang, Luyuan; Hou, Xiaolin; Wei, Ting; Kang, Shichang; Qin, Xiang
发表日期	2018
ISSN	0094-8276
EISSN	1944-8007
卷号	45 期号:13
英文摘要	We present data of I-129 deposition in fresh snow in the Laohugou glacier basin, northeast Tibetan Plateau, in summer 2016 and 2017, and trace its source and elevational distribution in the troposphere. Our results show that the I-129/I-127 atomic ratios in the fresh snow on the glacier surface are about 2 orders of magnitude larger than those in the Antarctic fresh snow and 4 orders the prenuclear level, indicating a predominantly anthropogenic source of the I-129 in the mountain glacier environment of northeast Tibetan Plateau. The I-129 level in the Laohugou glacier basin is 1-2 orders of magnitude lower than at representative European locations, and not significantly higher than that observed at other sites in Asia. The I-129/I-127 atomic ratio and I-129 level show clear increases with elevation from 4,300 to 5,100m above sea level. The I-129 in the Laohugou glacier basin is probably deposited from the upper troposphere where there exists a local maximum of I-129. A conceptual model for interpretation of the observed I-129 concentration and profile in Laohugou is provided. Thus, this work is of importance in providing a more complete view on the transport, dispersion, and removal of I-129 in the atmosphere. Plain Language Summary We measured the concentration measurements of I-129, together with I-129/I-127 atomic ratios, deposited in the fresh snow at various altitudes, in the Laohugou glacier basin, western Qilian Mountains, northeast Tibetan Plateau. This unique dataset provides the first evidence how I-129 deposition varies with height in the middle troposphere, and a glimpse on the dispersion and pathway of anthropogenic radioiodine pollutants to the remote Tibetan Plateau glaciers. The dataset is thus an important addition to the global I-129 database. The observations at Laohugou show that I-129 increases, in contrast to I-127 and heavy metals Pb and Ni which decrease, with height in the middle troposphere. This suggests that the source of the deposited I-129 is located in the upper troposphere. A hypothetic interpretation of the observed I-129 profile is provided.
关键词	I-129 human nuclear activities elevational distribution glacier snowpack pollution transport in troposphere
学科领域	Geology
语种	英语
WOS研究方向	Geosciences, Multidisciplinary
来源期刊	GEOPHYSICAL RESEARCH LETTERS
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/111953
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryosphere Sci, Lanzhou, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Dong, Zhiwen,Shao, Yaping,Qin, Dahe,et al. Insight Into Radio-Isotope I-129 Deposition in Fresh Snow at a Remote Glacier Basin of Northeast Tibetan Plateau, China[J]. 中国科学院西北生态环境资源研究院,2018,45(13).
APA	Dong, Zhiwen.,Shao, Yaping.,Qin, Dahe.,Zhang, Luyuan.,Hou, Xiaolin.,...&Qin, Xiang.(2018).Insight Into Radio-Isotope I-129 Deposition in Fresh Snow at a Remote Glacier Basin of Northeast Tibetan Plateau, China.GEOPHYSICAL RESEARCH LETTERS,45(13).
MLA	Dong, Zhiwen,et al."Insight Into Radio-Isotope I-129 Deposition in Fresh Snow at a Remote Glacier Basin of Northeast Tibetan Plateau, China".GEOPHYSICAL RESEARCH LETTERS 45.13(2018).