WARNING: THESE IMAGES ARE PROVIDED FOR GUIDANCE AND PLANNING PURPOSES ONLY. THEY REQUIRE EXPERT INTERPRETATION IN METEOROLOGY, ATMOSPHERIC TRANSPORT MODELLING AS WELL AS POTENTIAL IMPACT ON HEALTH. THEY ARE NOT TO BE USED AS A SUBSTITUTE TO OFFICIAL INFORMATION PROVIDED BY HEALTH CANADA, THE CANADIAN NUCLEAR SAFETY COMMISSION AND PUBLIC SAFETY CANADA.

 

UPDATED 18 MARCH:  CHANGES MADE TO PRODUCTS AT THE REQUEST OF HEALTH CANADA. THEY ARE HIGHLIGHTED IN BLUE BELOW.

 

MLDP0:

 

The MLDP0 outputs are produced automatically using hypothetical radioactive releases and different input parameters over two geographical domains and forecast periods.

 

Short-range modelling:

  • Domain covering Japan at 5 km grid mesh
  • Forecast duration: 72 h
  • Release duration: 24 h
  • Release quantity: 1 Bq of Cs-137
  • Starting release hours:
    • 04, 06, 08, 10, 12, 14 UTC using forecast wind fields of the GEM GLOBAL 00 UTC model run
    • 16, 18, 20, 22, 00, 02 UTC using forecast wind fields of the GEM GLOBAL 12 UTC model run
  • Maximum initial plume height: 500 m
  • Vertical distribution: uniform

 

Long-range modelling:

  • Domain covering north Pacific at 50 km grid mesh
  • Forecast duration: 168 h
  • Release duration: 48 h
  • Release quantity: 1 Bq of Cs-137
  • Starting release hours:
    • 04 UTC using forecast wind fields of the GEM GLOBAL 00 UTC model run
    • 16 UTC using forecast wind fields of the GEM GLOBAL 12 UTC model run
  • Maximum initial plume height: 500 m
  • Vertical distribution: uniform

 

A few definitions:

  • CV: Average surface concentration below 500 m [Bq/m3]
  • CVI : Cumulative time-integrated surface concentration below 500 m [Bq∙h/m3] (NOTE: time unit is hour, not second)
  • DW: Cumulative total deposition [Bq/m2]
  • MF: 24-h time-integrated surface concentration below 500 m [B∙s/m3] based on the WMO RSMC Standard (n: time unit is second, not hour)
  • IT: Cumulative total deposition at 24-h intervals [Bq/m2] based on the WMO RSMC Standard
  • TOA: Time of earliest arrival (a plume may pass over a location more than once) in hours after the start of the release

 

Available products:

  • Individual images for CV and full animations
  • TOA (one image per run)
  • MF and IT (a few images per run)
  • Shapefiles CV , CVI and DW

 

 

TRAJECTORIES:

 

The trajectories are produced automatically using hypothetical radioactive releases. The following parameters are used in these simulations:

 

  • Forecast duration: 72 h
  • Starting release hours:
    • 04, 06, 08, 10, 12, 14 UTC using forecast wind fields of the GEM GLOBAL 00 UTC model run
    • 16, 18, 20, 22, 00, 02 UTC using forecast wind fields of the GEM GLOBAL 12 UTC model run