Radiocesium in the Taiwan Strait and the Kuroshio east of Taiwan from 2018 to 2019

Abstract The release of anthropogenic radiocesium to the North Pacific Ocean (NPO) has occurred in the past 60 years. Factors controlling 137Cs (half-life, 30.2 year) and 134Cs (half-life, 2.06 year) activity concentrations in the Kuroshio east of Taiwan and the Taiwan Strait (latitude 20° N–27° N,...

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Autores principales:	Wei-Jen Huang, Ming-Ta Lee, Kuei-Chen Huang, Kai-Jung Kao, Ming-An Lee, Yiing-Jang Yang, Sen Jan, Chen-Tung Arthur Chen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e10cc5b44b42484f86a2a3027e10497f
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spelling	oai:doaj.org-article:e10cc5b44b42484f86a2a3027e10497f2021-11-21T12:20:30ZRadiocesium in the Taiwan Strait and the Kuroshio east of Taiwan from 2018 to 201910.1038/s41598-021-01895-y2045-2322https://doaj.org/article/e10cc5b44b42484f86a2a3027e10497f2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01895-yhttps://doaj.org/toc/2045-2322Abstract The release of anthropogenic radiocesium to the North Pacific Ocean (NPO) has occurred in the past 60 years. Factors controlling 137Cs (half-life, 30.2 year) and 134Cs (half-life, 2.06 year) activity concentrations in the Kuroshio east of Taiwan and the Taiwan Strait (latitude 20° N–27° N, longitude 116° E–123° E) remain unclear. This study collected seawater samples throughout this region and analyzed 134Cs and 137Cs activity concentrations between 2018 and 2019. A principal component analysis (PCA) was performed to analyze the controlling factors of radiocesium. Results of all 134Cs activity concentrations were below the detection limit (0.5 Bq m−3). Analyses of water column 137Cs profiles revealed a primary concentration peak (2.1–2.2 Bq m−3) at a depth range of 200–400 m (potential density σθ: 25.3 to 26.1 kg m−3). The PCA result suggests that this primary peak was related to density layers in the water column. A secondary 137Cs peak (1.90 Bq m−3) was observed in the near-surface waters (σθ = 18.8 to 21.4 kg m−3) and was possibly related to upwelling and river-to-sea mixing on the shelf. In the Taiwan Strait, 137Cs activity concentrations in the near-surface waters were higher in the summer than in the winter. We suggest that upwelling facilitates the vertical transport of 137Cs at the shelf break of the western NPO.Wei-Jen HuangMing-Ta LeeKuei-Chen HuangKai-Jung KaoMing-An LeeYiing-Jang YangSen JanChen-Tung Arthur ChenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Wei-Jen Huang Ming-Ta Lee Kuei-Chen Huang Kai-Jung Kao Ming-An Lee Yiing-Jang Yang Sen Jan Chen-Tung Arthur Chen Radiocesium in the Taiwan Strait and the Kuroshio east of Taiwan from 2018 to 2019
description	Abstract The release of anthropogenic radiocesium to the North Pacific Ocean (NPO) has occurred in the past 60 years. Factors controlling 137Cs (half-life, 30.2 year) and 134Cs (half-life, 2.06 year) activity concentrations in the Kuroshio east of Taiwan and the Taiwan Strait (latitude 20° N–27° N, longitude 116° E–123° E) remain unclear. This study collected seawater samples throughout this region and analyzed 134Cs and 137Cs activity concentrations between 2018 and 2019. A principal component analysis (PCA) was performed to analyze the controlling factors of radiocesium. Results of all 134Cs activity concentrations were below the detection limit (0.5 Bq m−3). Analyses of water column 137Cs profiles revealed a primary concentration peak (2.1–2.2 Bq m−3) at a depth range of 200–400 m (potential density σθ: 25.3 to 26.1 kg m−3). The PCA result suggests that this primary peak was related to density layers in the water column. A secondary 137Cs peak (1.90 Bq m−3) was observed in the near-surface waters (σθ = 18.8 to 21.4 kg m−3) and was possibly related to upwelling and river-to-sea mixing on the shelf. In the Taiwan Strait, 137Cs activity concentrations in the near-surface waters were higher in the summer than in the winter. We suggest that upwelling facilitates the vertical transport of 137Cs at the shelf break of the western NPO.
format	article
author	Wei-Jen Huang Ming-Ta Lee Kuei-Chen Huang Kai-Jung Kao Ming-An Lee Yiing-Jang Yang Sen Jan Chen-Tung Arthur Chen
author_facet	Wei-Jen Huang Ming-Ta Lee Kuei-Chen Huang Kai-Jung Kao Ming-An Lee Yiing-Jang Yang Sen Jan Chen-Tung Arthur Chen
author_sort	Wei-Jen Huang
title	Radiocesium in the Taiwan Strait and the Kuroshio east of Taiwan from 2018 to 2019
title_short	Radiocesium in the Taiwan Strait and the Kuroshio east of Taiwan from 2018 to 2019
title_full	Radiocesium in the Taiwan Strait and the Kuroshio east of Taiwan from 2018 to 2019
title_fullStr	Radiocesium in the Taiwan Strait and the Kuroshio east of Taiwan from 2018 to 2019
title_full_unstemmed	Radiocesium in the Taiwan Strait and the Kuroshio east of Taiwan from 2018 to 2019
title_sort	radiocesium in the taiwan strait and the kuroshio east of taiwan from 2018 to 2019
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e10cc5b44b42484f86a2a3027e10497f
work_keys_str_mv	AT weijenhuang radiocesiuminthetaiwanstraitandthekuroshioeastoftaiwanfrom2018to2019 AT mingtalee radiocesiuminthetaiwanstraitandthekuroshioeastoftaiwanfrom2018to2019 AT kueichenhuang radiocesiuminthetaiwanstraitandthekuroshioeastoftaiwanfrom2018to2019 AT kaijungkao radiocesiuminthetaiwanstraitandthekuroshioeastoftaiwanfrom2018to2019 AT minganlee radiocesiuminthetaiwanstraitandthekuroshioeastoftaiwanfrom2018to2019 AT yiingjangyang radiocesiuminthetaiwanstraitandthekuroshioeastoftaiwanfrom2018to2019 AT senjan radiocesiuminthetaiwanstraitandthekuroshioeastoftaiwanfrom2018to2019 AT chentungarthurchen radiocesiuminthetaiwanstraitandthekuroshioeastoftaiwanfrom2018to2019
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Radiocesium in the Taiwan Strait and the Kuroshio east of Taiwan from 2018 to 2019

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