[MITgcm-support] MITgcm tangent linear

Antoine Hochet ahochet at ucsd.edu
Sun Feb 25 15:38:26 EST 2018

Hi all,

I'd like to use the MITgcm tangent linear (I have a staf licence) to calculate a few eigenmodes of a given steady state. However I am new to MITgcm and I can't find documentation online about the tangent linear... So I am wondering if someone could help me with the following questions:

To calculate the eigenmodes I need to run the tangent linear on the same steady state several times, using output of iteration number n as the new initial perturbation of iteration number n+1. However I am not sure to understand how I can control the initial perturbation and get the tangent linear ouputs… Is this done with the control and cost packages ?and if yes, how ?

Also It seems that the outputs produced by the diagnostics package with the tangent linear are exactly the same as the outputs produced by the full forward model, is it normal ?

thank you for your help,


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