[ecco-support] [EXTERNAL] adxx_sst and sss

[Fenty, Ian G (US 329B)]

Hi Emma,

MITgcm code within “#ifdef blocks” are only compiled if the variable is defined via a ‘define directive’.
https://www.gsp.com/cgi-bin/man.cgi?section=1&topic=fpp#Conditional_source_code_selection

Take the code block below as an example.

#ifdef ZZZ
 X = 1+1
#endif

The code X = 1+1 would only be compiled if ‘ZZZ’ were defined via a define directive.  The corresponding define directive is simply:

#define ZZZ

Define directives are added to the *.h files (like CTRL_OPTIONS.h) that you modify to configure your model setup.  After changing define directives in your *.h files, you have to recompile your code:

Take a look at the following lines from the CTRL_OPTIONS.h file used for ECCO V4r4:  https://github.com/ECCO-GROUP/ECCO-v4-Configurations/blob/bdaaf6308e8e09f08a52d28f559119ff34a59827/ECCOv4%20Release%204/code/CTRL_OPTIONS.h#L43-L45

#define ALLOW_UVEL0_CONTROL
#define ALLOW_VVEL0_CONTROL

I believe all you need to do to enable adxx_sst and adxx_sss is to add the following define directives to your CTRL_OPTIONS.h file and then recompile.
#define ALLOW_SST_CONTROL
#define ALLOW_SSS_CONTROL

-Ian


From: ecco-support <ecco-support-bounces at mit.edu> on behalf of Emma Boland <emmomp at bas.ac.uk>
Date: Tuesday, March 14, 2023 at 8:43 AM
To: ecco-support at mit.edu <ecco-support at mit.edu>
Subject: [EXTERNAL] [ecco-support] adxx_sst and sss

Hi All,

I've been successfully running ECCOv4 r4 in adjoint mode and generating sensitivities such as adxx_qnet, adxx_tauu. I'm now interested in looking at sensitivities to SST and SSS, and can see from the ctrl package code that it should be possible to add xx_sst and xx_sss as control variables. I've run a short test and I am indeed generating adxx_sst/sss but they are coming out all zeros (other adxx files from the same run are non-zero).

Can anyone let me know if I need to do anything else to get adxx_sst and sss working? I can see from inspection of the code that the ctrl variable contributions are only summed if ALLOW_SS[T/S]_CONTROL are defined but I can't see where these logical variables are set?

Thanks,

Emma
--
Dr Emma Boland | Physical Oceanographer | British Antarctic Survey
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