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- Title
Impact of the atmospheric depositions estimated by the different models to the 137Cs and 134Cs activity in the North Pacific Ocean by eddy-resolving ROMS.
- Authors
Tsubono, Takaki; Misumi, Kazuhiro; Tsumune, Daisuke; Aoyama, Michio
- Abstract
We conducted the two ensemble simulations of 134Cs and 137Cs activity in theNorth Pacific Ocean (NPO) water after the Fukushima Dai-ichi Nuclear PowerPlant (1F NPP) using the two atmospheric deposition fluxes estimated by a globalaerosol transport model (Aoyama et al, 2015), Model of Aerosol Species IN theGlobal Atmosphere (MASINGAR MK-II), and a regional scale offline coupledmeteorology-aerosol chemical transport model (Kajino et al, 2012)), MeteorologicalResearch Institute. Passive-tracers Model for radionuclides (MRI-PM/r) in addition tothe direct discharge (Tsumune et al., 2013) from the power plant. The differencebetween both model is the total deposition amount into the NPO water in Marchand April 2011; 6.4 PBq for MASINGAR, 5.0 PBq for MPI-PM/r. In addition,The MASINGAR estimated larger (smaller) total deposition in north (south) ofKuroshio Extension than MPI-PM/r. Since the Pre-calculations represented the 134Csinputs of both models were not enough, we calculated the magnifications for theinput by the regression analysis between the observed and calculated 134Cs. Themagnifications provided the increased total amounts of 134Cs and 137Cs activity inNPO water after accident, which is 16± 1.5 PBq for MASINGAR, 21 ± 2 PBq forMPI-PM/r. We conducted simulations 137Cs activity in the NPO using the magnifieddeposition fluxes and compared the results with the observations. The comparisonrepresented that the correlation coefficient and the root mean square error were 0.86 and5.7 Bq/ m−3 for MASINGAR, 0.75 and 7.3 Bq/ m−3 for MPI-PM/r. The verticaldistributions of 134Cs for the model with MPI-PM/r represented relatively largeractivity in the Subtropical Mode Water in 165∘E in 2012 than that for the model withMASINGAR. The model with MPI-PM/r represented that the 134Cs activity wasdetected west of Okinawa Islands by 2014, while MASINGAR by 2012. Thesedifference were expected to be depended on the amount of input south of the KuroshioExtension.
- Subjects
ATMOSPHERIC deposition; STANDARD deviations; CHEMICAL plants; NUCLEAR power plants
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article