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To start this tutorial please enter folder 'forward'. |
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To plot a particular parameter and level we need to filter the desired fields from the resulting FLEXPART output GRIB file. Unfortunately, Metview's Grib Filter icon cannot handle these files (partly due to the local GRIB definition they use) so we need to use other means to cope with this task. For this reason and also to make FLEXPART output handling easier a set of Metview Macro Library Functions were developed. We will use these functions in the example below. |
Inspecting the FLEXPART GRIB file
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Next, we define the contouring. The "feflux" fields are automatically scaled into "ng have the units of "kg m**-2 " for contouring (see here for details) s**-1" but with the current value range it is better to use "g ng m**-2 s**-1" units would better fit for contouring. To achieve it this we simply multiply the "tcmdfeflux" fieldset with 10001012:
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g=g*1E12 |
The contour definition itself goes like this:
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#The contour levels cont_list=[1,10,50,100,150,200,250,500,750,1000,2000,4000] #Define contour shading flux_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" ) |
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