NCL Script to Plot Relative Vorticity

The NCL graphics package.

NCL Script to Plot Relative Vorticity

Postby pskunjeer » Wed Oct 10, 2018 9:30 am

Dear Sir,

I am new to WRF and NCl. I want to plot the Vertical cross section Relative Vorticity with topography.

I have read that in ncl_talk that we can plot Relative Vorticity by subtracting Coriolis from Absoulute Vorticity. But the problem is that

Absoulute Vorticity has
Number of Dimensions: 4
Dimensions and sizes: [Time | 1] x [bottom_top | 32] x [south_north | 231] x [west_east | 234]

Coriolis has
Number of Dimensions: 3
Dimensions and sizes: [Time | 1] x [south_north | 231] x [west_east | 234]

I think we have to create the loop over levels and subtract Coriolis for each level.

Can somebody please explain how to create this NCL script with loop.

Also, I want to plot topography in the Vertical cross-section. In GrADS this functionality is available by converting topography in pressure coordinates.

In pressure coordinates, the topography can be represented by the surface pressure (surface pressure decreases with increased topographical height). Since the surface pressure is a 2D and not a 3D variable, you have to fix the height in GrADS to the lowest model level (usually done by 'set lev 1000', or 'set z 1')

Is this available in NCL and how to write the script?

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