VOLCANIC FINE ASH FORECAST
 Model: FLEXPART
 Meteorology: GFS
 By: NILU
 Date: 20220602 13:08 CET

 Model simulation details:
 Volcano: Grímsvötn                                                                                                             
 Location: 64.4N, -17.3W
 Altitude/Summit elevation:  1725 m a.s.l

 Start of release:     20220602      120000  UTC
 End of release:       20220606      120000  UTC

 Total volume of ash released (m^3):   0.14E+08
 Volcanic Explosivity Index = 3

 Fine ash mass fraction:  0.05
 Fine ash emission rate:    0.50E+04 kg/s
 Total fine ash mass released:   0.17E+10 kg

 Plume height (km above vent):     7
 Uniform vertical distribution of the ash in the eruption column, from the vent up to plume height.

 Particle size distribution:
 Particle size (um diameter)   :   fraction
               0.20            :   0.001
               0.65            :   0.005
               2.00            :   0.050
               6.50            :   0.200
              20.00            :   0.700
              65.00            :   0.044

 Particle density:  0.25E+04 kg/m3

 Emission rate, fine ash fraction and plume height are from a USGS database
 Mastin, L.G., et al, 2009:
 Preliminary spreadsheet of eruption source parameters for volcanoes of the world: 
 U.S. Geological Survey Open-File Report 2009-1133, v. 1.2, 25 p.
 [http://pubs.usgs.gov/of/2009/1133/].

 Model output grid:
 Horizontal resolution (dx,dy): 0.5 x 0.5 degrees
 Vertical resolution (dz):  1000 meters (from 0-30km)
 Lower left corner (Lon, Lat): -179,-90 (GLOBAL)
 Temporal resolution: 1-hourly averaged ash conc.
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