Tangent Initial Norm is NaN

Discussion about tangent linear and adjoint models, variational data assimilation, and other related issues.

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leon
Posts: 78
Joined: Mon Mar 03, 2008 4:14 am

Tangent Initial Norm is NaN

#1 Post by leon » Wed Jul 01, 2015 4:23 pm

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
Posts: 15
Joined: Wed Apr 23, 2014 12:05 pm
Location: Tsinghua University

Re: Tangent Initial Norm is NaN

#2 Post by Arvin_Yin » Sat Sep 05, 2015 9:14 am

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
Posts: 10
Joined: Wed Sep 15, 2010 1:59 pm
Location: UNSW Australia

Re: Tangent Initial Norm is NaN

#3 Post by ckerry » Mon Jul 23, 2018 12:00 am

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

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