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

在破冰船SHIRASE上使用高灵敏度氡气探测器对从纹别到鸟取的日本海（2004年9月13日至9月17日）和从弗里曼特尔出发的南极洋经SYOWA站进行了大气氡气连续测量到悉尼（2004年12月13日-2005年3月18日）氡气观测结果预计将有助于建立了从其他大陆、南美洲和非洲到南极洲的大气远程传输模型，结果总结如下：1）观测到的南极海洋大气氡浓度最低背景水平0.02Bqm-^3。海洋大气氡通量模拟结果为0.01Rncm-^2s^<-1>.2)观测到氡浓度快速增加事件（氡风暴） 2005 年 2 月 25 日对南极海洋的 6 次氡气风暴探测成功，与 SYOWA 站和 SHIRASE 进行了平行观测，该站在距离 SYOWA 500 公里的阿蒙森湾近海处设有两个观测点。从NOAA卫星照片上看，这次氡气风暴事件是从南美洲传送到SOYWA站的一周观测数据。大气输送模型的评价数据，观测到达时间与模型评价时间一致，但氡浓度与观测不同，SHIRASE 0.145Bqm^<-3>和SYOWA 0.085Bqm^<-3>。和评估 0.024Bqm^<-3> 该模型未能模拟 SYOWA 站的氡气风暴事件的幅度。这些高浓度事件可能是一次。预计这些对南极海洋氡气的观测结果将有助于大气远程传输模型的发展。