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Re: [ferret_users] Manually interpolate zero degree level


I think Jasper actually wants @WEQ rather than @LOC since his independent height variable is pressure not geopotential height.


let isotherm_0 = temp[z=@WEQ:0]  ! pressure kernel at 0 degrees
let integrand_0 = geopotential*isotherm_0/9.81  !
let/title="geopotential height on 0 degree isotherm" z_g_0 = integrand_0[z=@sum] ! interpolated Z_g


On 18/05/17 05:17, Ansley C. Manke wrote:

Look at the transformation @LOC which picks out the data at a specified value.


On 5/17/2017 6:14 AM, Jasper Denissen wrote:
Dear ferret users,

I've got two variables, temperature T (K) and geopotential Z (m^2/s^2) on 25 pressure levels and a certain spatial extent. What I want to do is find the exact (read linearly interpolated) height of the zero degree level. All I found in the ferret documentation was interpolate transformations which fill data gaps, but I just need to define one variable which contains the interpolated geopotential height (geopotential / 9.81) at which the interpolated temperature equals zero. If there are several heights where T = 0, please take the lowest height.

I think this should be a fairly simple transformation, but I can't seem to find the answer myself. Someone please help me!

Kind regards,

Jasper Denissen
MSc student Earth & Environment
Wageningen University

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