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Title: International challenge to model the long-range transport of radioxenon released from medical isotope production to six Comprehensive Nuclear-Test-Ban Treaty monitoring stations

After performing a first multi-model exercise in 2015 a comprehensive and technically more demanding atmospheric transport modelling challenge was organized in 2016. Release data were provided by the Australian Nuclear Science and Technology Organization radiopharmaceutical facility in Sydney (Australia) for a one month period. Measured samples for the same time frame were gathered from six International Monitoring System stations in the Southern Hemisphere with distances to the source ranging between 680 (Melbourne) and about 17,000 km (Tristan da Cunha). Participants were prompted to work with unit emissions in pre-defined emission intervals (daily, half-daily, 3-hourly and hourly emission segment lengths) and in order to perform a blind test actual emission values were not provided to them. Despite the quite different settings of the two atmospheric transport modelling challenges there is common evidence that for long-range atmospheric transport using temporally highly resolved emissions and highly space-resolved meteorological input fields has no significant advantage compared to using lower resolved ones. As well an uncertainty of up to 20% in the daily stack emission data turns out to be acceptable for the purpose of a study like this. Model performance at individual stations is quite diverse depending largely on successfully capturing boundary layer processes.more » No single model-meteorology combination performs best for all stations. Moreover, the stations statistics do not depend on the distance between the source and the individual stations. Finally, it became more evident how future exercises need to be designed. Set-up parameters like the meteorological driver or the output grid resolution should be pre-scribed in order to enhance diversity as well as comparability among model runs.« less
Authors:
 [1] ; ORCiD logo [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ORCiD logo [7] ;  [8] ;  [9] ; ORCiD logo [9] ;  [10] ; ORCiD logo [11] ;  [12] ;  [13] ;  [13] ; ORCiD logo [13] ;  [14] ;  [3] ; ORCiD logo [3] more »;  [3] ;  [15] ; ORCiD logo [16] ;  [16] ; ORCiD logo [17] ;  [17] ;  [18] ; ORCiD logo [18] ;  [18] ; ORCiD logo [18] ; ORCiD logo [2] ;  [4] « less
  1. Central Inst. for Meteorology and Geodynamics (ZAMG), Vienna (Austria)
  2. Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Vienna (Austria). International Data Center
  3. National Oceanic and Atmospheric Administration Air Resources Lab., College Park, MD (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  5. Univ. of Natural Resources and Life Sciences, Vienna (Austria). Inst. of Meteorology
  6. Australian Radiation Protection and Nuclear Safety Agency, Miranda, NSW (Australia)
  7. Univ. of Vienna (Austria). Dept. of Meteorology and Geophysics
  8. Federal Inst. for Geosciences and Natural Resources (BGR), Hanover (Germany)
  9. Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
  10. Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Vienna (Austria). International Data Center; Princeton Univ., NJ (United States). Program on Science and Global Security
  11. Environment and Climate Change Canada, Montreal, QC (Canada). Meteorological Service of Canada. Canadian Meteorological Centre. Environmental Emergency Response Section
  12. Swedish Defence Research Agency, Stockholm (Sweden)
  13. Inst. for Radiation Protection and Nuclear Safety (IRSN), Fontenay-aux-Roses (France)
  14. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
  15. Met Office, Exeter (United Kingdom)
  16. Nuclear Research Center (SCK - CEN), Mol (Belgium); Royal Meteorological Inst., Brussels (Belgium)
  17. National Data Center (NDC), Reading (United Kingdom)
  18. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). National Atmospheric Release Advisory Center (NARAC)
Publication Date:
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Journal of Environmental Radioactivity
Additional Journal Information:
Journal Name: Journal of Environmental Radioactivity; Journal ID: ISSN 0265-931X
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Central Inst. for Meteorology and Geodynamics (ZAMG), Vienna (Austria); Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Vienna (Austria)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; atmospheric transport modelling; nuclear explosion monitoring; medical isotope production; radioxenon background; model inter-comparison and evaluation
OSTI Identifier:
1427522