Japan Geoscience Union Meeting 2015

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Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-AG Applied Geosciences

[M-AG38] Dynamics of radionuclides emitted from Fukuchima Dai-ichi Nuclear Power Plant in the environment

Tue. May 26, 2015 9:00 AM - 10:45 AM 301B (3F)

Convener:*Kazuyuki Kita(Faculty of Science, Ibaraki University), Yuichi Onda(Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba), Teruyuki Nakajima(Atmosphere and Ocean Research Institute), Yasuhito Igarashi(Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute), Masatoshi Yamada(Institute of Radiation Emergency Medicine, Hirosaki University), Chisato Takenaka(Graduate school of bioagricultural sciences, Nagoya University), masayoshi yamamoto(Low Level Radioactivity Laboratory, Kanazawa University), Atsushi Shinohara(Graduate school of science, Osaka University), Chair:Yasuhito Igarashi(Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute)

10:00 AM - 10:15 AM

[MAG38-05] Impact of the regional climate on the transport of radioactive materials

*Takao YOSHIKANE1, Kei YOSHIMURA1, Akane SAYA1 (1.Atmosphere and Ocean Research Institute, University of Tokyo)

Keywords:Radioactive materials, Regional climate, Regional model

Radioactive materials, which are released from Fukushima-Daiichi unclear power plants (FDUPP) in March 2011, is transported to Kanto and Tohoku areas. From many previous studies, the transport process of the radioactive materials has been clear. However the relation between the regional climate and transport process still is not sufficient to reveal. We investigated the mechanism of the transport to Kanto area using a regional model considering the regional climate in March. From the results, it is found that the radioactive materials, which are observed on 21th March 2011, is transported by the northeasterly in the lower layer from FDUPP to Kanto area. Generally, the northeasterly often forms corresponding to the low pressure system and the stationary front, which often form along the southern coastal area of Kanto area and causes the warm front with southerly warm wind. It is found that the cold air of the northeasterly is formed by cold air surges accompany with winter monsoon and moves to south corresponding to the temperature gradient in meridional direction near the surface. Therefore the northeasterly also has the property of gravity current. The wind field could be greatly influenced by the local temperature distribution because the cold air surges are often found in the off-shore of the Fukushima Prefecture. We will report the detailed transport process by numerical experiences applying the past events.