Added OM4p25 COBALTv3 example

[yichengt900]

Recently, several users have requested access to a global COBALTv3 configuration. In this PR, we’ve added a 0.25° COBALTv3 example, with ocean physics based on the OM4p25 configuration and using JRA forcing.

With COBALTv3, users can now set or override default BGC parameters in the COBALT_input or COBALT_override files, similar to the approach in MOM6/SIS2. Please note that the configurations provided here are still experimental and not yet finalized. However, it should serve as a useful starting point for global cases. CC @feida6996. @feida6996, it would be appreciated if you could take a quick look at INPUT/COBALT_input and confirm that it aligns with your parameter choices for a constant river TA and DIC case.

[feida6996]

@yichengt900, I’ve double-checked the parameters you highlighted and confirm they align with my test. Based on my results, these parameters should yield approximately 0.1 Pg-C/yr of aragonite and ~0.3 Pg-C/yr of calcite at 100m. This gives a total calcium carbonate flux of about 0.4 Pg-C/yr at 100m, consistent with Stock et al. (2020). However, these fluxes should vary slightly with the recent fixes we discussed over the past few months.

• Note that these fluxes were calculated from my test, which included low downward shortwave radiation due to the albedo issue. I expect the calcium carbonate flux could increase by about 25% if the albedo were corrected.
• Additionally, my test didn't incorporate the recent pull request #101. Including this pull request should reduce the calcium carbonate flux by around 5%.

In summary, incorporating these two recent updates should yield a calcium carbonate flux in the range of 0.4–0.5 Pg-C/yr, aligning with the 0.4 Pg-C/yr flux seen in ESM4.1 or reported by Stock et al. (2020).