Pu-239,Pu-240 and U-236 records of an ice core from the eastern Tien Shan (Central Asia)
Radioisotopes (239Pu, 240Pu, 236U) formed during atmospheric nuclear weapons testing (NWT) can be used for dating and therefore be applied as markers of the beginning of the Anthropocene Epoch. Moreover, 240Pu/239Pu ratios enable source identification (general fallout, local emission sources). Ice c...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/227394 2023-05-15T16:38:45+02:00 Pu-239,Pu-240 and U-236 records of an ice core from the eastern Tien Shan (Central Asia) Wang, Chaomin Hou, Shugui Pang, Hongxi Liu, Yaping Gaggeler, Heinz W. Christl, Marcus Synal, Hans-Arno 2017-10 application/application/pdf https://hdl.handle.net/20.500.11850/227394 https://doi.org/10.3929/ethz-b-000227394 en eng International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2017.59 info:eu-repo/semantics/altIdentifier/wos/000418851100015 http://hdl.handle.net/20.500.11850/227394 doi:10.3929/ethz-b-000227394 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International CC-BY-NC-SA Journal of Glaciology, 63 (241) glacier chemistry ice core mountain glaciers info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftethz https://doi.org/20.500.11850/227394 https://doi.org/10.3929/ethz-b-000227394 https://doi.org/10.1017/jog.2017.59 2022-04-25T13:21:49Z Radioisotopes (239Pu, 240Pu, 236U) formed during atmospheric nuclear weapons testing (NWT) can be used for dating and therefore be applied as markers of the beginning of the Anthropocene Epoch. Moreover, 240Pu/239Pu ratios enable source identification (general fallout, local emission sources). Ice core segments from a 57.6 m ice core to bedrock from eastern Tien Shan, China were selected for 239,240Pu and 236U analyses by using compact low-energy accelerator mass spectrometry. The observed 240Pu/239Pu atom ratios were 0.18 ± 0.02, with one exception, indicating global fallout. No evidence for emissions from the nearby local sources Lop Nor was observed. The total deposition rates during NWT for 239Pu and 240Pu amount to 1.55 × 109 atoms·cm−2 and 3.1 × 108 atoms·cm−2, respectively. With the higher undisturbed fallout of 239Pu compared with values reported for glaciers from European Alps at Col du Dome and Colle Gnifetti as well as from the polar region, the eastern Tien Shan glacier would be an ideal site for defining the start of the Anthropocene. 236U is a rather new environmental tracer, while little is known about its global fallout from NWT. The observed deposition flux of 236U during NWT amounts to 3.5 × 108 atoms·cm−2 at the drill site. The average 236U/239Pu ratio of 0.27 ± 0.09 is in good agreement with literature values from global fallout. ISSN:0022-1430 ISSN:1727-5652 Article in Journal/Newspaper ice core Journal of Glaciology ETH Zürich Research Collection Core Mountain ENVELOPE(-127.187,-127.187,53.466,53.466) |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
glacier chemistry ice core mountain glaciers |
spellingShingle |
glacier chemistry ice core mountain glaciers Wang, Chaomin Hou, Shugui Pang, Hongxi Liu, Yaping Gaggeler, Heinz W. Christl, Marcus Synal, Hans-Arno Pu-239,Pu-240 and U-236 records of an ice core from the eastern Tien Shan (Central Asia) |
topic_facet |
glacier chemistry ice core mountain glaciers |
description |
Radioisotopes (239Pu, 240Pu, 236U) formed during atmospheric nuclear weapons testing (NWT) can be used for dating and therefore be applied as markers of the beginning of the Anthropocene Epoch. Moreover, 240Pu/239Pu ratios enable source identification (general fallout, local emission sources). Ice core segments from a 57.6 m ice core to bedrock from eastern Tien Shan, China were selected for 239,240Pu and 236U analyses by using compact low-energy accelerator mass spectrometry. The observed 240Pu/239Pu atom ratios were 0.18 ± 0.02, with one exception, indicating global fallout. No evidence for emissions from the nearby local sources Lop Nor was observed. The total deposition rates during NWT for 239Pu and 240Pu amount to 1.55 × 109 atoms·cm−2 and 3.1 × 108 atoms·cm−2, respectively. With the higher undisturbed fallout of 239Pu compared with values reported for glaciers from European Alps at Col du Dome and Colle Gnifetti as well as from the polar region, the eastern Tien Shan glacier would be an ideal site for defining the start of the Anthropocene. 236U is a rather new environmental tracer, while little is known about its global fallout from NWT. The observed deposition flux of 236U during NWT amounts to 3.5 × 108 atoms·cm−2 at the drill site. The average 236U/239Pu ratio of 0.27 ± 0.09 is in good agreement with literature values from global fallout. ISSN:0022-1430 ISSN:1727-5652 |
format |
Article in Journal/Newspaper |
author |
Wang, Chaomin Hou, Shugui Pang, Hongxi Liu, Yaping Gaggeler, Heinz W. Christl, Marcus Synal, Hans-Arno |
author_facet |
Wang, Chaomin Hou, Shugui Pang, Hongxi Liu, Yaping Gaggeler, Heinz W. Christl, Marcus Synal, Hans-Arno |
author_sort |
Wang, Chaomin |
title |
Pu-239,Pu-240 and U-236 records of an ice core from the eastern Tien Shan (Central Asia) |
title_short |
Pu-239,Pu-240 and U-236 records of an ice core from the eastern Tien Shan (Central Asia) |
title_full |
Pu-239,Pu-240 and U-236 records of an ice core from the eastern Tien Shan (Central Asia) |
title_fullStr |
Pu-239,Pu-240 and U-236 records of an ice core from the eastern Tien Shan (Central Asia) |
title_full_unstemmed |
Pu-239,Pu-240 and U-236 records of an ice core from the eastern Tien Shan (Central Asia) |
title_sort |
pu-239,pu-240 and u-236 records of an ice core from the eastern tien shan (central asia) |
publisher |
International Glaciological Society |
publishDate |
2017 |
url |
https://hdl.handle.net/20.500.11850/227394 https://doi.org/10.3929/ethz-b-000227394 |
long_lat |
ENVELOPE(-127.187,-127.187,53.466,53.466) |
geographic |
Core Mountain |
geographic_facet |
Core Mountain |
genre |
ice core Journal of Glaciology |
genre_facet |
ice core Journal of Glaciology |
op_source |
Journal of Glaciology, 63 (241) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2017.59 info:eu-repo/semantics/altIdentifier/wos/000418851100015 http://hdl.handle.net/20.500.11850/227394 doi:10.3929/ethz-b-000227394 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International |
op_rightsnorm |
CC-BY-NC-SA |
op_doi |
https://doi.org/20.500.11850/227394 https://doi.org/10.3929/ethz-b-000227394 https://doi.org/10.1017/jog.2017.59 |
_version_ |
1766029082118586368 |