In a previous study in 2016, we presented how ¹²⁹I in coral cores from the east (Baler) and west (Parola) sides of the Philippines recorded the impacts of human nuclear activities, including nuclear weapons testing, nuclear fuel reprocessing, and nuclear accidents. However, the 2016 Baler dataset only had a two-year time resolution and a crude age model based on growth band counting. Here we present a new 2020 Baler ¹²⁹I/¹²⁷I atomic ratio dataset that features at least annual time resolution and a more accurate age model constructed using 3D X-ray Computed Tomography. Results show that the bomb peaks in Baler primarily came from the Pacific Proving Grounds or PPG with a time lag of about 1.8 years (or more specifically, between 1.3 and 2.4 years). Moreover, a review of the Parola dataset shows that PPG signals may have been transported to Parola in the West Philippine Sea via two pathways: the northward and southward bifurcations of the North Equatorial Current, reaching Parola about 4.5 and 8.5 years after detonation, respectively. Moreover, a prominent peak in the year 2014.7 in Baler possibly came from the 2011 Fukushima Accident, transported by the Kuroshio Recirculation Gyre and the North Pacific Mode Waters with a 3.5-year time lag. This study contributes to the understanding of the impact and transport of human-made radionuclides to the Philippines and the relevant oceanographic processes in the Western Equatorial Pacific region.

在2016年的先前研究中，我们介绍了菲律宾东部（Baler）和西部（Parola）两侧珊瑚核中的¹²⁹ I如何记录人类核活动的影响，包括核武器测试，核燃料后处理和核事故。但是，2016年的Baler数据集只有两年的时间分辨率和基于增长带计数的粗略年龄模型。在这里，我们提出了一种新的2020 Baler ¹²⁹ I / ¹²⁷我的原子比率数据集至少具有年度时间分辨率和使用3D X射线计算机断层扫描构造的更准确的年龄模型。结果表明，Baler的炸弹高峰主要来自太平洋试验场或PPG，时滞约为1.8年（或更具体地，介于1.3到2.4年之间）。此外，对Parola数据集的审查显示，PPG信号可能已经通过两种途径被传输到西菲律宾海的Parola：北赤道洋流的北和南分叉，分别在爆炸后4.5年和8.5年到达Parola。此外，2014年7月Baler峰的高峰可能来自2011年的福岛事故，该事故是由黑潮循环水道和北太平洋模式水域运送的，时滞为3.5年。