Is the Lanczos vector file necessary for adjoint to initials

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leon
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Is the Lanczos vector file necessary for adjoint to initials

#1 Post by leon » Fri Mar 27, 2015 2:19 am

Hi all,

In WC13 R4DVAR_sensitivity case, the Lanczos vector file is needed for the adjoint sensitivity analysis to the observation. However, if we only consider the adjoint sensitivity to the initial/forcing/obcs, is the Lanczos vector files still necessary?

If the file is necessary, how can we get it? In the WC13 case, a standard R4DVAR is used to get the Lanczos vectors. If we only do the sensitivity study like Moore et al. (2009) "An Adjoint Sensitivity Analysis of the Southern California Current Circulation and Ecosystem", how do we get the Lanczos vectors?

Thank you very much for help.

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