CAMS

h1. Description of the MesoNH file format

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MesoNH simulation output is saved into NetCDF (.nc) files with the specific dimensions and variables below. For information, the spatial resolution is *25m per cell* for the <code>W_E_direction</code> , <code>W_E_direction</code>, and <code>vertical_levels</code>. Temporal resolution is *5 seconds*.

The dataset description below has been obtained with the <code>ncinfo</code> command included in <code>netcdf4-python</code>

<pre>

title: Meso-NH simulation

    grid_resolution_in_meters:    25.000000      x    25.000000     

    description: Data are from the file REFHR.1.ARMCu.001.dia       

    comments:  Meso-NH  experience starts at 1997    6   21   41400.0000   and 

               segment starts at 1997    6   21   63000.0000 

dimensions(sizes): 

    time(144), 

    W_E_direction(256),

    S_N_direction(256), 

    vertical_levels(160)

variables(dimensions): 

    int32 time(time), 

    float32 W_E_direction(W_E_direction), 

    float32 S_N_direction(S_N_direction), 

    float32 LON0(), 

    float32 LAT0(), 

    float32 LONOR(), 

    float32 LATOR(),

    float32 BETA(), 

    float32 RPK(), 

    float32 THT(time, vertical_levels, S_N_direction, W_E_direction), 

    float32 VLEV(vertical_levels, S_N_direction, W_E_direction), 

    float32 LAT(S_N_direction, W_E_direction), 

    float32 LON(S_N_direction, W_E_direction), 

    float32 TKET(time, vertical_levels, S_N_direction, W_E_direction), 

    float32 UT(time, vertical_levels, S_N_direction, W_E_direction), 

    float32 VT(time, vertical_levels, S_N_direction, W_E_direction), 

    float32 WT(time, vertical_levels, S_N_direction, W_E_direction), 

    float32 PABST(time, vertical_levels, S_N_direction, W_E_direction), 

    float32 RVT(time, vertical_levels, S_N_direction, W_E_direction), 

    float32 RCT(time, vertical_levels, S_N_direction, W_E_direction), 

    float32 RRT(time, vertical_levels, S_N_direction, W_E_direction), 

    float32 SVT001(time, vertical_levels, S_N_direction, W_E_direction),

    float32 SVT002(time, vertical_levels, S_N_direction, W_E_direction),

    float32 SVT003(time, vertical_levels, S_N_direction, W_E_d

!ncview.png!

irection)

</pre>

h2. Viewing the contents of a NetCDF (.nc) file

the nco package provides the ncview program to display netCDF files.

!ncview.png!

h2. Sample cloud file

attachment:cloud_example.nc (Contains 2 seconds and 2 vertical levels only)