Tangent Initial Norm is NaN

[leon]

Hi all,

When I do the optimal perturbation run, I got the error info at the first step of model run.

PROPAGATOR - Grid: 01, Tangent Initial Norm: NaN

STEP Day HH:MM:SS KINETIC_ENRG POTEN_ENRG TOTAL_ENRG NET_VOLUME
0 55136 00:00:00 5.704437E-23 NaN NaN 6.042164E+16

I'm not sure what causes this problem. The forward model runs fine. Does the Tangent Initial Norm calculated from the itl.nc file? Any suggestions are highly appreciated. Thank you very much.

[Arvin_Yin]

Hi, leon

I believe you have solved this problem already. Now I have the similar error like you
in my IS4D-Var run, my initial gradient norm (Gnorm) is NaN.

Could you tell me more about this error and how you solved it?

Thank you very much.

[ckerry]

Hi,
Just wondering if either of you solved this issue?
Thanks