Time series study of a 17-year record of 7Be and 210Pb fluxes in northern Taiwan using ensemble empirical mode decomposition

NCUIR > Research Center > Cognitive Intelligence & Precision Healthcar > journal & Dissertation > Item 987654321/107850

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/107850

Title:	Time series study of a 17-year record of 7Be and 210Pb fluxes in northern Taiwan using ensemble empirical mode decomposition
Authors:	黃鍔;Lee, H-I;Huh, C-A;Lee, T;Huang, N E
Contributors:	認知智慧與精準健康照護研究中心
Keywords:	Beryllium - analysis;Lead Radioisotopes - analysis;Radiation Monitoring;Radioisotopes - analysis;Seasons;Taiwan
Date:	2015-09-01
Issue Date:	2026-04-23 14:27:12 (UTC+8)
Publisher:	Elsevier Ltd.;England
Abstract:	摘要： Using the ensemble empirical mode decomposition (EEMD) and a significance test method, we have analyzed time series data on the fluxes of (7)Be and (210)Pb collected over a span of 17 y in Northern Taiwan. Among nine intrinsic mode functions (IMFs) extracted from the method five (IMF4-8) are non-trivial for (210)Pb and have adequate S/N with significant power in localized windows around the periodicities of 0.5 y, 1 y, 2 y, 5 y, and 11 y, respectively. For (7)Be, IMF5 and IMF8 with periods around 1 y and 11 y, respectively, have adequate S/N. The semi-annual and annual cycles represented by IMF4 and IMF5, respectively, are dominated by East Asian monsoon. The sum of IMF6 and IMF7 reveals an inter-annual cycle where both (7)Be and (210)Pb fluxes are well-correlated with the East Asian winter monsoon index (EAWMI). The close tracking of the (210)Pb and (7)Be in IMF8 cases may reflect an 11 y cycle; implying that it is caused by common climatologic factors, likely related to solar cycle, rather than their distinct production modes. 其他題名： J Environ Radioact 出版者： England 出版日期： 2015-09 出處： Journal of environmental radioactivity, 2015-09, Vol.147, p.14 版權： Copyright © 2015 Elsevier Ltd. All rights reserved. 識別號： EISSN: 1879-1700 識別號： DOI: 10.1016/j.jenvrad.2015.04.017 識別號： PMID: 26005772
Appears in Collections:	[Cognitive Intelligence & Precision Healthcar] journal & Dissertation

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