Simulation of Radioactive Tracer Transport Using Isorsm and Uncertainty Analyses

Saya, Akane; Yoshimura, Kei; Oki, Taikan

doi:10.2208/jscejhe.69.i_1765

Cited by 3 publications

(8 citation statements)

References 12 publications

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“…For the results reported herein, we used a version of IsoRSM in which aerosol forms of 131 I and 137 Cs and their deposition processes were implemented by Saya et al (). Yoshikane et al () showed that the radioactive material version of IsoRSM was reasonably skilled at simulating radioactive materials produced in the Fukushima accident.…”

Section: Methodsmentioning

confidence: 99%

“…In our previous study, a set of sensitivity tests for the parameters in dry and wet deposition processes, that is, dry depositional speed and washout coefficient, was conducted. It could be concluded from the results that the washout coefficient in the model formulation of the wet deposition process clearly impacted the wet deposition concentrations and their spatial and temporal distributions, whereas changes in that parameter in the dry deposition process did not influence the dry deposition as much as for wet deposition (Saya et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Precipitation Redistribution Method for Regional Simulations of Radioactive Material Transport During the Fukushima Daiichi Nuclear Power Plant Accident

et al. 2018

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To reproduce more accurate deposition maps of radioactive materials released in the Fukushima Daiichi Nuclear Power Plant accident in March 2011, our study focuses on the uncertainty of atmospheric transport simulations caused by precipitation. In our new method, simulated wet deposition distribution of 137Cs is modified by high‐resolution radar rain gauge data of observed precipitation. Sensitivity experiments are conducted to examine the impact of using both different reanalyzed meteorological data sets as boundary condition and the observation data of precipitation as the redistribution of simulated precipitation. Among the results, the experiment modified by high‐resolution radar rain gauge data realized the most accurate cumulative 137Cs deposition from 18 to 27 March. While the meteorological field is reasonably simulated in the atmospheric transport model in the experiments, the results showed that applying observed precipitation also contributes to improve the accuracy of simulated wet deposition amount.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precipitation Redistribution Method for Regional Simulations of Radioactive Material Transport During the Fukushima Daiichi Nuclear Power Plant Accident

et al. 2018

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“…The first is the ORG run, which is identical to the control experiment of Saya et al (2013), wherein tracer fields are calculated in the spectral space, as is performed in the original IsoRSM. The second is the SL run, wherein the specific humidity and radioactive material ( 131 I and 137 Cs) tracer fields are calculated by the NDSL scheme.…”

Section: Experiments Designmentioning

confidence: 99%

“…In contrast, a general chemical transport model uses precipitation as an external forcing. Yoshimura (2011) and Saya et al (2013) modified IsoRSM to enable the simulation of the transport of radioactive tracers. Isotopic variables were replaced with radioactive tracers (i.e., 131 I and 137 Cs), and dry and wet deposition processes caused by gravity and precipitation processes, respectively, were introduced.…”

Section: Introductionmentioning

confidence: 99%

“…Isotopic variables were replaced with radioactive tracers (i.e., 131 I and 137 Cs), and dry and wet deposition processes caused by gravity and precipitation processes, respectively, were introduced. Saya et al (2013) proposed a wet deposition process wherein the deposition is proportional to the ratio of the amount of condensed water to the total amount of water, whereas a traditional method (e.g., Maryon et al, 1991) considers only the amount of condensed water. In this study, the radioactive tracer mode of IsoRSM is used as an original framework.…”

Section: Introductionmentioning

confidence: 99%

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A semi-Lagrangian advection scheme for radioactive tracers in the NCEP Regional Spectral Model (RSM)

Chang

Yoshimura

2015

Geosci. Model Dev.

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Abstract. In this study, the non-iteration dimensional-split semi-Lagrangian (NDSL) advection scheme is applied to the National Centers for Environmental Prediction (NCEP) Regional Spectral Model (RSM) to alleviate the Gibbs phenomenon. The Gibbs phenomenon is a problem wherein negative values of positive-definite quantities (e.g., moisture and tracers) are generated by the spectral space transformation in a spectral model system. To solve this problem, the spectral prognostic specific humidity and radioactive tracer advection scheme is replaced by the NDSL advection scheme, which considers advection of tracers in a grid system without spectral space transformations. A regional version of the NDSL is developed in this study and is applied to the RSM. Idealized experiments show that the regional version of the NDSL is successful. The model runs for an actual case study suggest that the NDSL can successfully advect radioactive tracers (iodine-131 and cesium-137) without noise from the Gibbs phenomenon. The NDSL can also remove negative specific humidity values produced in spectral calculations without losing detailed features.

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A semi-Lagrangian advection scheme for radioactive tracers in a regional spectral model

Chang¹,

Yoshimura²

2015

Preprint

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Abstract. In this study, the non-iteration dimensional-split semi-Lagrangian (NDSL) advection scheme is applied to the National Centers for Environmental Prediction (NCEP) regional spectral model (RSM) to alleviate the Gibbs phenomenon. The Gibbs phenomenon is a problem wherein negative values of positive-definite quantities (e.g., moisture and tracers) are generated by the spectral space transformation in a spectral model system. To solve this problem, the spectral prognostic specific humidity and radioactive tracer advection scheme is replaced by the NDSL advection scheme, which considers advection of tracers in a grid system without spectral space transformations. A regional version of the NDSL is developed in this study and is applied to the RSM. Idealized experiments show that the regional version of the NDSL is successful. The model runs for an actual case study suggest that the NDSL can successfully advect radioactive tracers (iodine-131 and cesium-137) without noise from the Gibbs phenomenon. The NDSL can also remove negative specific humidity values produced in spectral calculations without losing detailed features.

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Simulation of Radioactive Tracer Transport Using Isorsm and Uncertainty Analyses

Cited by 3 publications

References 12 publications

Precipitation Redistribution Method for Regional Simulations of Radioactive Material Transport During the Fukushima Daiichi Nuclear Power Plant Accident

Precipitation Redistribution Method for Regional Simulations of Radioactive Material Transport During the Fukushima Daiichi Nuclear Power Plant Accident

A semi-Lagrangian advection scheme for radioactive tracers in the NCEP Regional Spectral Model (RSM)

A semi-Lagrangian advection scheme for radioactive tracers in a regional spectral model

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