For preparations and running the simulation needed for this tutorial click here ...
| Note |
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To start this tutorial please enter folder 'forward'. |
The total column integrated mass is not an output of FLEXPART so we need to compute it. The macro to do the computation and plot the resulting fields is 'plot_total.mv'.
In the macro first we call flexpart_total_column() to compute the "tcmd" fields:
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dIn="result_fwd/"
inFile=dIn & "conc_s001.grib"
#Compute the total column integrated mass
g=flexpart_total_column(source: inFile, param: "mdc")
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Next, we define the contouring. The "tcmd" fields have the units of "kg m**-2" but with the current value range "g m**-2" units would better fit for contouring. To achieve it we simply multiply the "tcmd" fieldset with 1000:
The contour definition itself goes like this:
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| language | py |
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| title | Define contouring |
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| collapse | true |
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cont_list=[0.00001,0.0001,0.0005,0.001,0.002,0.005,0.01,0.05]
#Define contour shading
conc_shade = mcont(
legend : "on",
contour : "off",
contour_level_selection_type : "level_list",
contour_level_list : cont_list,
contour_label : "off",
contour_shade : "on",
contour_shade_method : "area_fill",
contour_shade_max_level_colour : "red",
contour_shade_min_level_colour : "RGB(0.14,0.37,0.86)",
contour_shade_colour_direction : "clockwise",
contour_method : "linear",
grib_scaling_of_derived_fields : "off"
)
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Next, we build the title with flexpart_build_title(). Please note that we need to explicitly specify the plotting units!
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title=flexpart_build_title(data: g,fontsize: 0.3,units: "g m**-2") |
Finally we define the map view:
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| language | py |
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| title | Defining the map view |
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| collapse | true |
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#Define coastlines
coast_grey = mcoast(
map_coastline_thickness : 2,
map_coastline_land_shade : "on",
map_coastline_land_shade_colour : "grey",
map_coastline_sea_shade : "on",
map_coastline_sea_shade_colour : "RGB(0.89,0.89,0.89)",
map_boundaries : "on",
map_boundaries_colour : "black",
map_grid_latitude_increment : 5,
map_grid_longitude_increment : 5
)
#Define geo view
view = geoview(
map_area_definition : "corners",
area : [40,-25,66,9],
coastlines : coast_grey
) |
and generate the plot:
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plot(view,g,conc_shade,title) |
Having run the macro we will get a plot like this (after navigating to step 39h):
