Universität zu Köln

Dong, Zhiwen ORCID: 0000-0003-4871-219X, Shao, Yaping ORCID: 0000-0002-2041-5479, Qin, Dahe, Zhang, Luyuan ORCID: 0000-0001-9972-0742, Hou, Xiaolin ORCID: 0000-0002-4851-4858, Wei, Ting, Kang, Shichang and Qin, Xiang (2018). Insight Into Radio-Isotope I-129 Deposition in Fresh Snow at a Remote Glacier Basin of Northeast Tibetan Plateau, China. Geophys. Res. Lett., 45 (13). S. 6726 - 6734. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Dong, Zhiwen UNSPECIFIED orcid.org/0000-0003-4871-219X UNSPECIFIED Shao, Yaping UNSPECIFIED orcid.org/0000-0002-2041-5479 UNSPECIFIED Qin, Dahe UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhang, Luyuan UNSPECIFIED orcid.org/0000-0001-9972-0742 UNSPECIFIED Hou, Xiaolin UNSPECIFIED orcid.org/0000-0002-4851-4858 UNSPECIFIED Wei, Ting UNSPECIFIED UNSPECIFIED UNSPECIFIED Kang, Shichang UNSPECIFIED UNSPECIFIED UNSPECIFIED Qin, Xiang UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-179657
DOI:	10.1029/2018GL078480
Journal or Publication Title:	Geophys. Res. Lett.
Volume:	45
Number:	13
Page Range:	S. 6726 - 6734
Date:	2018
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	1944-8007
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Institute for Geophysics and Meteorology
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ATMOSPHERIC FALLOUT; FUKUSHIMA; PRECIPITATION; RADIONUCLIDES; SPECIATION; SEAWATER; JAPAN; LEVEL; CL-36 Multiple languages Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17965