[M-AG34] [EJ] Dynamics of radionuclides emitted from Fukuchima Dai-ichi Nuclear Power Plant in the environment

[MAG34-P02] Atmospheric radioCs in case of the local dust event

*Yasuhito Igarashi¹, Mizuo Kajino¹, Masamitsu Hayasaki², Kouji Adachi¹, Yuji Zaizen³, Thomas Sekiyama¹ (1.Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute, 2.Center for Regional Environmental Research, National Institute for Environmental Studies , 3.Forecast Research Department, Meteorological Research Institute)

Keywords:radioCs, local dust event, concentration

Atmospheric radioCs seems suspended along with surface soil dust when the strong wind creates local dust event. Local surface contamination may have resulted in the enhancement of the radioCs concentration when the local dust event occurred. Although Ishizuka et al. (2017) made the radioCs resuspension computation scheme due to the dust uplift in the air by wind blow, the effect of the local dust event has not been evidenced nor confirmed in detail so far. Furthermore, though Kajino et al. (2016) has simulated yearly resuspension in 2013 due to the dust suspension and those from the forest, event-based case study has not been carried out. In this presentation, some of such events are analyzed in terms of the radioCs resuspension. The dust event occurred in March 2013 was analyzed for meteorology and temporal change in radioCs concentration observed at Meteorological Research Institute in Tsukuba. The simulated results of radioCs concentration in Tsukuba is compared with the observed results. These analysis would suggest qualitatively minor effect of the local dust events on the enhancement of the radioCs concentration.