It was chosen in this list of variable to separate the Northward and Eastward wind as in future we my encounter parameterization of surface turbulence which take wind direction into account. To avoid problems of past inter-comparison projects with the separation of precipitation into rainfall and snowfall it was chosen to provide these two variables separately instead of precipitation only.
The choice of units, sign convention and rank of the data are described above.
As a general rule fluxes are averaged over the time-step of the forcing data. The fluxes need to be conserved when a time interpolation is applied before the data is fed to the land-surface scheme. Other variables on the contrary should be instantaneous samples in order to capture well the diurnal cycle. This obviously only applies if the time sampling is high enough for the instantaneous variables to be representative of the time interval. For this table, variables which will be provided as averages are in red
The
expected range of values for the forcing variables is provided and will be
checked when the netCDF is produced.
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Eastward wind measured at reference levels near the surface (3D variable). |
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It is thus proposed here to allow for both solution and to encourage modelling centers to improve their description of the sub-grid variability of atmospheric variables.
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Until a better solution is found the spacial variance is proposed.
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In order to avoid having to change the code from one case to another a sample code section is proposed which allows to keep all the flexibility in the software.
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