To demonstrate a synergy between radionuclide (RN) and infrasound observations and Atmospheric Transport Modelling (ATM), the volcanic activity of Bogoslof in Alaska, USA, is used as an example. The study period covers 3 months of intense eruptive activity, from 19 December 2016 to 8 March 2017. During that period, the International Monitoring System (IMS) infrasound station located in Alaska, USA, recorded signals from three eruptive sequences. The second sequence was reported in the International Data Centre (IDC) Reviewed Event Bulletin (REB) with 3 infrasound stations: in Alaska, USA, in Kamchatka, Russian Federation and in Hawaii, USA. As reported by The Alaska Volcano Observatory (AVO), during each of these events ash plumes reaching the altitude of more than 10 km were observed for several consecutive days. These observations were used to identify the length of each eruptive episode. To demonstrate the influence of volcanic ash on the berillium-7 (Be-7) activity concentration values measured by two IMS RN stations in Alaska, the ATM was used. To monitor the arrival time of a volcanic ash plume at the IMS stations, a series of 14 days forward simulations released daily from Bogoslof during each of these events, was generated. Comparison of Be-7 daily surface values with the seasonal median for the period of 9 years (2009–2017), revealed that an influx of volcanic ash up to the tropopause (1.5–12 km) tends to locally increase surface Be-7 concentrations in area under the influence of subsiding ash plume. It is also demonstrated that with the arrival of volcanic ash at the surface level, the enrichment in radioactive particulates like uranium, thorium, and potassium was observed.

中文翻译：

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放射性核素和次声观测与大气传输建模模拟之间的协同作用：Bogoslof 案例

为了证明放射性核素 (RN) 和次声观测以及大气传输建模 (ATM) 之间的协同作用，我们以美国阿拉斯加州博戈斯洛夫的火山活动为例。研究期间涵盖了从 2016 年 12 月 19 日到 2017 年 3 月 8 日的 3 个月强烈喷发活动。在此期间，位于美国阿拉斯加的国际监测系统 (IMS) 次声站记录了来自三个喷发序列的信号。国际数据中心 (IDC) 审查事件公报 (REB) 报告了第二个序列，其中有 3 个次声站：美国阿拉斯加、俄罗斯联邦堪察加和美国夏威夷。正如阿拉斯加火山天文台 (AVO) 报告的那样，在这些事件中的每一个事件中，连续几天都观察到达到 10 公里以上高度的灰羽。这些观察结果用于确定每个喷发事件的长度。为了证明火山灰对阿拉斯加的两个 IMS RN 站测量的铍 7 (Be-7) 活动浓度值的影响，使用了 ATM。为了监测火山灰羽流到达 IMS 站的时间，在这些事件中的每一个期间，Bogoslof 每天发布一系列 14 天的前向模拟。Be-7 日表面值与 9 年（2009-2017 年）期间的季节性中值的比较表明，火山灰涌入对流层顶（1.5-12 公里）往往会局部增加地表 Be-7 浓度在下沉的灰羽影响下的区域。还表明，随着火山灰到达地表，铀、钍、