Water Circulation and Marine Environment in the Antarctic Traced by Speciation of I-129 and I-127

Emissions of anthropogenic I-129 from human nuclear activities are now detected in the surface water of the Antarctic seas. Surface seawater samples from the Drake Passage, Bellingshausen, Amundsen, and Ross Seas were analyzed for total I-129 and I-127, as well as for iodide and iodate of these two...

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Bibliographic Details
Published in:Scientific Reports
Main Authors: Xing, Shan, Hou, Xiaolin, Aldahan, Ala, Possnert, Göran, Shi, Keliang, Yi, Peng, Zhou, Weijian
Format: Article in Journal/Newspaper
Language:English
Published: Uppsala universitet, Luft-, vatten- och landskapslära 2017
Subjects:
Oceanography
Hydrology and Water Resources
Oceanografi
hydrologi och vattenresurser
Antarctic
Antarctic Peninsula
Drake Passage
The Antarctic
Antarc*
Iceberg*
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-334040
https://doi.org/10.1038/s41598-017-07765-w
Description
Summary:Emissions of anthropogenic I-129 from human nuclear activities are now detected in the surface water of the Antarctic seas. Surface seawater samples from the Drake Passage, Bellingshausen, Amundsen, and Ross Seas were analyzed for total I-129 and I-127, as well as for iodide and iodate of these two isotopes. The variability of I-127 and I-129 concentrations and their species (I-127(-)/(IO3-)-I-127, I-129(-)/(IO3-)-I-129) suggest limited environmental impact where ((1.15-3.15) x 10(6) atoms/L for I-129 concentration and (0.61-1.98) x 10(-11) for I-129/I-127 atomic ratios are the lowest ones compared to the other oceans. The iodine distribution patterns provide useful information on surface water transport and mixing that are vital for better understanding of the Southern Oceans effects on the global climate change. The results indicate multiple spatial interactions between the Antarctic Circumpolar Current (ACC) and Antarctic Peninsula Coastal Current (APCC). These interactions happen in restricted circulation pathways that may partly relate to glacial melting and icebergs transport. Biological activity during the warm season should be one of the key factors controlling the reduction of iodate in the coastal water in the Antarctic.

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