{"created":"2023-06-20T13:03:44.172957+00:00","id":2291,"links":{},"metadata":{"_buckets":{"deposit":"f487214e-981d-4248-a2f2-7d13f387903c"},"_deposit":{"created_by":10,"id":"2291","owners":[10],"pid":{"revision_id":0,"type":"depid","value":"2291"},"status":"published"},"_oai":{"id":"oai:osu.repo.nii.ac.jp:00002291","sets":["22","22:8"]},"author_link":[],"control_number":"2291","item_10006_date_granted_11":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2021-03-19"}]},"item_10006_degree_grantor_9":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"大阪産業大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"34407","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_10006_degree_name_8":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（人間環境学）"}]},"item_10006_description_10":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_description":"2020年度","subitem_description_type":"Other"}]},"item_10006_description_7":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"This study aimed to understand the behaviour of cosmogenic airborne 7Be and airborne 210Pb, and the relationship between the particle size distribution and major chemical composition of aerosols attached by 7Be. Air dust samples, total deposition samples, and aerosol size distribution were collected at the rooftop of building No. 16, Osaka Sangyo University located in Daito, Osaka, Japan (34.71 °N, 135.64 °E; the height above ground level was 31 m). \nAir dust samples in near-surface air were collected weekly. The seasonal 210Pb and 7Be concentrations were determined from January 8, 2018 to December 31, 2020. The average monthly concentration of 7Be ranged from 2.15 士 0.28 to 8.84 士 0.62 mBq/㎥, and the average value was 5.04 士 1.12 mBq/㎥. The average monthly concentration of 210Pb ranged from 0.43 士 0.17 to 1.93 士 0.02 mBq/㎥, and the average value was 0.78 士 0.30 mBq/㎥. Despite their different origins and distribution throughout the atmosphere, they presented the same seasonal variation. Furthermore, there was a tendency for a maximum during the spring and autumn season, and a minimum during summer.The variation in concentration showed a strong correlation between 210Pb and 7Be (CC = 0.72). The seasonal pattern from the 7Be concentration showed good agreement with the long-term study (15 years) at Sakai, Osaka, which was reported by Megumi et al. (2000). To understand the seasonal pattern of 210Pb and 7Be, the factors causing the variation were analysed. For 7Be, the results showed a medium correlation for the total suspended particle (TSP) (CC = 0.53) and percentage of the relative humidity (%RH) (CC = -0．40), a weak correlation in precipitation (CC = 0.32) and particulate matter(PM) 2.5 (CC = 0.32), very weak in the sunspot number (CC = -0.17), and neutron flux from the cosmic rays (CC = 0.02). For 210Pb, the results showed a strong correlation in TSP (CC = 0.63), and a weak correlation in pressure (CC = -0.27), wind speed (CC = -0．25), precipitation (CC = 0.25) and %RH (CC = -0.23), and very weak PM 2.5 (CC = 0.12). Although the local meteorological factors were necessary to understand the seasonal pattern of 7Be and 210Pb, the results showed almost a weak correlation. Thus, the transportation processes of 7Be and 210Pb were investigated on a global scale. The air mass motions were estimated by using the NOAA HYSPLIT model, and the meteorological data sets from the Global Data Assimilation System (GDAS) to simulate the backward air mass trajectories. 7Be was produced in the upper atmosphere; the heights were the troposphere where the long-range transportation of aerosols (2,000 m and 6,000 m) occurred, and the border between the troposphere and the stratosphere (20,000 m), which was the level of 7Be production. Moreover, 7Be was continuously produced in the lower stratosphere (70%) and upper troposphere (30%), as reported by Yoshimori (2005). The origin of 210Pb came from the ground; the heights were 500 m, 1000 m, and 1,500 m, respectively, which were the atmospheric turbulence that strongly influenced the meteorology and dispersion. In summer, both 7Be and 210Pb showed an air mass almost passing over the Pacific Ocean, or lower latitudes that carried the low atmospheric concentration level. In winter, spring, and autumn, the air mass almost passed over the continent, or higher latitudes, which the origin of the air mass transported from Eastern and Northern China, and the far eastern part of Russia carried the high atmospheric concentration level. \nMonthly deposition samples, including rain and atmospheric deposition, were collected from November 2019 to October 2020. The annual total depositions of 7Be and 210Pb were 1655 士 26Bq/㎡ and 273 士 7Bq/㎡ respectively. A very strong correlation between precipitation and total deposition of 7Be (CC= 0.88) and 210Pb (CC= 0.85) was observed. The annual deposition pattern of the total 7Be and 210Pb deposition showed a high level in March, July, and October. The 7Be deposition pattern at Sakai, which was a long-term study, showed a spring peak pattern. The results of the current study showed a different pattern with Sakai because this study period was only for one year, and high precipitation was found in March, July, and October. Therefore, for the long-term study, the spring peak was expected in the area. The wet deposition was the main deposition in 7Be (79.07 %) and 210Pb (67.87%). Thus, high precipitation could increase the 7Be and 210Pb deposition of air by wash out.\nIn this study, the relationship between the size distribution of the 7Be aerosol particles in the surface air and Particulate Matter's (PM) major chemical composition were analysed in size distributions to investigate the PM's main inorganic species in the atmospheric aerosol particles as a carrier of 7Be. The main inorganic species of the PM were nitrate(NO3-), ammonium (NH4+），sulfate (SO42-), and sea salt, which represented a 1: 1 ratio of sodium ion(Na+) and chloride ion (Cl-). Every two weeks from June 6, 2020, to August 28, 2020, and in December 2020, aerosol size distributions were collected, and the aerosols were classified into 12 sizes ranging from 0.06 to 12.01 µm. The activity size distribution of the 7Be-aerosols peaked in the 0.33 ~ 0.55 µm size range. The mass size distribution of NH4+ and SO42- peaked in the 0.33 ~ 0.55 µm size range, N03- peaked in the 2.20 ~ 3.90 µm size range, and Na+ and Cl- peaked in the 1.20 ~ 2.20 µm size range. For the inorganic species, the diameter of aerosol particles in summer was smaller than in winter because summer had lower humidity than winter. High relative humidity conditions resulted in an increased particle size of the atmospheric aerosols that were removed from the atmosphere by the influence of gravity. The dominant ionic species were SO42- among anions and NH4+ among cations, and their mass median aerodynamic diameter (MMAD) was 0.63 士 0.15 µm and 0.61 士 0.15 µm, respectively, which was almost identical to the activity median aerodynamic diameter (AMAD) of 7Be activity size distribution (AMAD=0.63 士 0.15 µm). For the variation of the inorganic species and the variation of 7Be, it was found that only SO42- had good agreement with the variation of the 7Be activity. SO42- is an anthropogenic product produced by burning fossil fuels from the Asian continent, especially China. Thus, SO42- would be the potential medium for 7Be, and this inorganic species could be traced and predicted based on the behaviour of 7Be.","subitem_description_type":"Abstract"}]},"item_10006_dissertation_number_12":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"人博第3号"}]},"item_10006_version_type_18":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"NOITHONG, Pannipa","creatorNameLang":"en"},{"creatorName":"ノイトン, パンニパー","creatorNameLang":"ja"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2021-06-18"}],"displaytype":"detail","filename":"博士論文内容の要旨および審査結果.pdf","filesize":[{"value":"3.6 MB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"label":"博士論文内容の要旨および審査結果","url":"https://osu.repo.nii.ac.jp/record/2291/files/博士論文内容の要旨および審査結果.pdf"},"version_id":"41c47835-dfce-4647-863f-e5e6eba6fcd1"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2021-06-18"}],"displaytype":"detail","filename":"博士論文.pdf","filesize":[{"value":"6.5 MB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"label":"博士論文","objectType":"fulltext","url":"https://osu.repo.nii.ac.jp/record/2291/files/博士論文.pdf"},"version_id":"0598d50d-45d4-4fa4-becd-1247f248b55c"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"7Be concentration","subitem_subject_scheme":"Other"},{"subitem_subject":"210Pb concentration","subitem_subject_scheme":"Other"},{"subitem_subject":"7Be deposition","subitem_subject_scheme":"Other"},{"subitem_subject":"210Pb deposition","subitem_subject_scheme":"Other"},{"subitem_subject":"seasonal variation","subitem_subject_scheme":"Other"},{"subitem_subject":"meteorological parameter","subitem_subject_scheme":"Other"},{"subitem_subject":"back trajectory","subitem_subject_scheme":"Other"},{"subitem_subject":"air mass origins","subitem_subject_scheme":"Other"},{"subitem_subject":"sulphate","subitem_subject_scheme":"Other"},{"subitem_subject":"7Be concentration","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"210Pb concentration","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"7Be deposition","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"210Pb deposition","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"seasonal variation","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"meteorological parameter","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"back trajectory","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"air mass origins","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"sulphate","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis"}]},"item_title":"Atmospheric concentration and deposition of cosmogenic 7Be and airborne 210Pb in Osaka Japan and identification of major chemical composition with size distributions of aerosols including air pollutants as the carrier of 7Be","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Atmospheric concentration and deposition of cosmogenic 7Be and airborne 210Pb in Osaka Japan and identification of major chemical composition with size distributions of aerosols including air pollutants as the carrier of 7Be","subitem_title_language":"en"}]},"item_type_id":"10006","owner":"10","path":["22","8"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2021-06-18"},"publish_date":"2021-06-18","publish_status":"0","recid":"2291","relation_version_is_last":true,"title":["Atmospheric concentration and deposition of cosmogenic 7Be and airborne 210Pb in Osaka Japan and identification of major chemical composition with size distributions of aerosols including air pollutants as the carrier of 7Be"],"weko_creator_id":"10","weko_shared_id":-1},"updated":"2024-04-17T07:08:41.041454+00:00"}