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Oscillation-free source term inversion of atmospheric radionuclide releases with joint model bias corrections and non-smooth competing priors
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2022
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Source: Journal of Hazardous Materials, 440, 129806
[PDF-2.84 MB]
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Journal Title:Journal of Hazardous Materials
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Personal Author:
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NOAA Program & Office:
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Description:The source term of atmospheric radionuclide releases is essential for the hazardous consequence assessment and emergency response. However, the artificial release oscillations in the source term estimate remain a fundamental challenge and may deliver misleading information, because of the unavoidable model biases and observation uncertainties. We propose a new method that removes oscillations while recovering the release details. This method explicitly corrects the model biases using the joint correction model and compensates the observation uncertainties through non-smooth competing priors that involve two rival functions. The new priors better model the unsteady feature of the radionuclide releases and distinguish the true releases from oscillations, enabling release-preserving oscillation removal. We extend the projected alternating minimization algorithm for an efficient solution. The method achieves oscillation-free and nearly perfect profiles for real releases of the Perfluoro-Methyl-Cyclo-Hexane on continental and regional scales, and the radionuclide 41Ar on a local scale, outperforming state-of-the-art and very recent methods. The sensitivities to model inputs and key parameters are also investigated. Robust performance is exhibited under emissions of both radioactive and non-radioactive substances, different meteorological inputs and numbers of observations, paving the way for identifying dynamic atmospheric radionuclide releases at multiple scales, especially when the release status is unknown.
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Source:Journal of Hazardous Materials, 440, 129806
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DOI:
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ISSN:0304-3894
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Rights Information:Accepted Manuscript
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Compliance:Submitted
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