DOI: 10.1016/j.atmosenv.2015.01.070
Scopus记录号: 2-s2.0-84922342018
论文题名: Source term estimation using air concentration measurements and a Lagrangian dispersion model - Experiments with pseudo and real cesium-137 observations from the Fukushima nuclear accident
作者: Chai T ; , Draxler R ; , Stein A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 106 起始页码: 241
结束页码: 251
语种: 英语
英文关键词: Air concentration
; Cesium-137
; Cost functional
; Fukushima nuclear accident
; Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model
; Lagrangian dispersion model
; Pseudo observations
; Source term estimation
; Transfer coefficient matrix (TCM)
Scopus关键词: Accidents
; Cesium
; Cost benefit analysis
; Costs
; Dispersions
; Forecasting
; Lagrange multipliers
; Matrix algebra
; Nuclear reactor accidents
; Singular value decomposition
; Uncertainty analysis
; Air concentrations
; Cesium 137
; Cost functionals
; Fukushima nuclear accidents
; Lagrangian
; Lagrangian dispersion model
; Pseudo-observations
; Source term estimation
; Transfer coefficient
; Cost estimating
; cesium 137
; atmospheric plume
; atmospheric pollution
; cesium isotope
; concentration (composition)
; dispersion
; experimental study
; nuclear accident
; radioactive pollution
; radionuclide
; air sampling
; Article
; controlled study
; decomposition
; Fukushima nuclear accident
; plume
; plume dispersion
; prediction
; priority journal
; uncertainty
; Fukushima [Tohoku]
; Honshu
; Japan
; Tohoku
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: A transfer coefficient matrix (TCM) was created in a previous study using a Lagrangian dispersion model to provide plume predictions under different emission scenarios. The TCM estimates the contribution of each emission period to all sampling locations and can be used to estimate source terms by adjusting emission rates to match the model prediction with the measurements. In this paper, the TCM is used to formulate a cost functional that measures the differences between the model predictions and the actual air concentration measurements. The cost functional also includes a background term which adds the differences between a first guess and the updated emission estimates. Uncertainties of the measurements, as well as those for the first guess of source terms are both considered in the cost functional. In addition, a penalty term is added to create a smooth temporal change in the release rate. The method is first tested with pseudo observations generated using the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model at the same location and time as the actual observations. The inverse estimation system is able to accurately recover the release rates and performs better than a direct solution using singular value decomposition (SVD). It is found that computing ln(. c) differences between model and observations is better than using the original concentration c differences in the cost functional. The inverse estimation results are not sensitive to artificially introduced observational errors or different first guesses. To further test the method, daily average cesium-137 air concentration measurements around the globe from the Fukushima nuclear accident are used to estimate the release of the radionuclide. Compared with the latest estimates by Katata etal. (2014), the recovered release rates successfully capture the main temporal variations. When using subsets of the measured data, the inverse estimation method still manages to identify most of the major events in the temporal profile of the release. © 2015 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81871
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: NOAA Air Resources Laboratory (ARL), NOAA Center for Weather and Climate Prediction, 5830 University Research Court, College Park, MD, United States; Cooperative Institute for Climate and Satellites, University of Maryland, College Park, MD, United States
Recommended Citation:
Chai T,, Draxler R,, Stein A. Source term estimation using air concentration measurements and a Lagrangian dispersion model - Experiments with pseudo and real cesium-137 observations from the Fukushima nuclear accident[J]. Atmospheric Environment,2015-01-01,106