Radon continuous observation on the sea surface atmosphere by using the high sensitive radon detector

高灵敏氡气探测器对海面大气氡气连续观测

• 批准号: 16310007
• 负责人: MATSUBARA Masaya
• 金额: $ 3.9万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16310007/
• 关键词: radon; high sensitive radon detector; radon continuous observation; atmospheric radon on sea surface; ice breaker SHIRASE; Antarctic Ocean; SYOWA station; atmospheric transport model

Continuous measurements of the atmospheric radon have been made in the ice breaker SHIRASE by the use of the high sensitive radon detector upon the Japan Sea from Monbetsu to Tottri(13 Sep.2004- 17 Sep.) and the Antarctic Ocean from Fremantle via SYOWA station to Sydney(13 Dec.2004 - 18 Mar.2005). The observation results of the radon will be expected to contribute for the development of the atmospheric long-range transport model to Antarctica from the other continents, South America and Africa. The results are summarized as follows.1) The observed minimum background level 0.02Bqm-^3 of the atmospheric radon concentration upon the Antarctic Ocean corresponds with the simulation results from the ocean atmospheric flux of radon 0.01Rncm-^2s^<-1>.2) The rapid increasing events of the radon concentration (radonic storm) were observed 6 events on the Antarctic Ocean. The radonic storm detection on 25-Feb 2005 was success to the parallel observation with the SYOWA station and SHIRASE, which w … More as shipped offshore Amundsen Gulf far 500km from SYOWA. Two observation points were located on the front of the depression from the NOAA satellite photographs. This radonic storm event turned out to be transport from the South America to SOYWA station with the one week by the comparison with the observation data and evaluated data of the Atmospheric transport model. The observation arrival time was coincident with the evaluation time of the model, but the radon concentrations were different with the observations, SHIRASE 0.145Bqm^<-3> and SYOWA 0.085Bqm^<-3> and evaluation 0.024Bqm^<-3>. The model failed to simulate the amplitudes of radonic storm events at SYOWA station. These high concentration events were possibly a result of filament-like horizontal structure or laminated vertical structure. The improvement of the model was expected for the radonic storm events. These radon observation results on the Antarctic Ocean will be contributed to the development of the atmospheric long-range transport model Less

用高灵敏度测氡仪连续测量了2004年9月13日至9月17日在日本海的破冰船Shirase内的大气氡。以及从弗里曼特尔经SYOWA站到达悉尼的南极海洋(2004年12月13日至2005年3月18日)。预计氡的观测结果将有助于发展从其他大陆、南美洲和非洲到南极洲的大气远程传输模式。结果表明：1)观测到的南极海洋大气氡浓度最低本底水平为0.02Bqm-3，与海洋大气氡浓度0.01Rncm-2s；-1&gt；-1的模拟结果相吻合；2)在南极海洋上观测到了6次氡浓度的快速增长事件。2005年2月25-2月的雷达风暴探测成功地实现了与SYOWA站和SHIRASE的平行观测，利用…更多的货物被运往距离SYOWA 500公里远的阿蒙森湾近海。根据NOAA卫星照片，两个观测点位于凹陷的前面。通过与大气输送模式的观测资料和评估资料的对比分析，证明这次雷达暴过程是从南美洲向SOYWA站输送，历时一周。观测到达时间与模型的评价时间一致，但测得的氡浓度与观测值不同，Shirase 0.145Bqm^-3&gt；和SYOWA 0.085Bqm^-3&gt；该模式不能模拟SYOWA站的辐射风暴事件的幅度。这些高浓度事件可能是细丝状水平结构或层状垂直结构的结果。对于辐射风暴事件，模型的改进是可望的。这些南极海洋测氡成果将对大气远程输送模式的发展贡献更少