I would like to run a WRF idealised simulation prescribing a 3D wind field.

I have modified module_initialize_ideal.F accordingly, following the example of the 'em_b_wave 'case for which a 2D wind field is prescribed, and got my wrfinput file ready to go.

However, I don't quite understand the implications of computing the 'base state' as a 1D field.

In particular, there are two aspects of how WRF ideal works that are not clear to me and I would be grateful if you could help me understand (bearing in mind that I have read the Technical Notes/User guide but my questions are still unanswered):

1) As far as I understand, using a 1D sounding to compute the base state is the default behaviour for WRF and this is the only way the model can work. The em_b_wave case uses the middle column values from the input sounding to compute the base state, and I have also selected a 'column of interest' for my calculations.

I wonder how this choice affects the final 'full state' (base state + perturbation), as each column in my input sounding has a different wind direction.

How is the base state actually used? is this single column used to compute the full state at all other grid-points?

2) I am running dry simulations (dry_sounding=.true.). In this case, wouldn't the perturbations quantities be zero as base state = full state?

I would be grateful if you could help me understand how WRF works in relation to the above points, so that I can be sure I am simulating what I need to (!).

Thank you very much in advance for your help,

Vittoria