Ocean Modeling Discussion

wilkin wrote: ↑Mon Sep 28, 2020 11:50 am Have you looked at the extensive set of tutorials, lectures and exercises at WikiROMS ...
https://www.myroms.org/wiki/4DVar_Tutorial_Introduction

Thanks very much. I did not follow this latest tutorial page. I will learn about it.

Hi,everyone.
Adjoint model is the key part of the 4D-Var assimilation systems, where it can provide gradients information of the cost function. BUT for ROMS, anybody knows how to conduct the AD-sensitivity experiments based on ADM? Any advice about .h and .in files? Thank you very much!

Hi everyone: I try to open cppdef: FORWARD_RHS, FORWARD_MIXING, FORWARD_READ and AD_SENSITIVITY to do this. The input file ocean_ads.nc is necessary, and I create a new file following wc13_ads.nc, whcih contains the scope masking. Its compiling works, but when run the oceanM, it come to error like ...

Hi:
Thanks very much for your introduction of AD-sensitivity. For a practical application, would you like to provide a note about how to select cpp options when conducting AD-sensitivity with ROMS?

Hi: As we all know, the adjoint model is a powerful tool to analyse the sensitivity of your cost function on the initial/forcing states, whcih has been used in 4DVAR assimulation approach. As a noob of ADM of ROMS, I'm confused about how to build up this framework. The adjoint sensitivty is the key ...

I have done a unformed work about adjoint sensitivity of regional ocean state to initial errors. I set CPP h files like this: /* OPTIONS associated with tangent linear, representer and adjoint models:*/ /**for ADM_FWD*/ #undef FORWARD_RHS /* use if processing forward right-hand-side terms **/ #undef ...

Hi,everyone: Adjoint model is a very useful tool to conduct a sensitivity study as well as optimization at a 4DVAR research. ROMS have been famous as a primitive ocean model with its own adjoint model. But, the discussion of ADM is little. How can we make a chat about how to buile ADM framework in ...

Hi, What troubled me for a long time was that how to turn on or buildup a coupling to ice model(CICE etc) in a ROMS run. I have successfully achieved a quarter-resolution simulation of Southern Ocean(30S-75S) without coupling to a ice model, whcih may cause much deviation to real ocean state. My ...

hi ezaron, Sorry about replying so late! And Thanks your suggestions very much! I'd have a try sincerely! Looking forward a new talk about this! Hi Li, Suppose you are interested in a linear function of the model's trajectory. Let the value of this function be denoted, y. Then there exists another ...

hi ezaron,
Sorry about replying so late! And Thanks your suggestions very much! I'd have a try sincerely! Looking forward a new talk about this!

Dear all, I have a modeling test about sensitivty analysis of Southern Ocean's MKE to initial conditions. Therefor, I had to use ROMS ADM to preduct of the gradient of cost function J to initial perturbations(x0'). I'm confusing that what shoule be inputted at ADM modeling step. Is it the gradident ...

Hi, you mentioned you had successfully run NLM,TLM and ADM about CCS. I'm doing a similar simulation of my area. So, I'm wondering how to run TLM and ADM and weather you could provide related *.h and *.in file about them. Does Optimal Stochastic means a optimail initial condition or forcing? If so ...