Global mean steric height change for multi-segment simulation

[owang01]

The global mean steric height change (sterGloH) is referenced to the global mean steric height at the beginning of a simulation. If the simulation is conducted as multiple segments, i.e. stop and restart, sterGloH would be referenced to the value at the beginning of each segment. So for any segment other than the first, the sterGloH values of the multi-segment simulation would be different from those from the long, one-segment, simulation.

Is there a way for any segment besides the first to know the value of sterGloH at the beginning of the first segment? This would probably involve making RHOsumGlob_0 and VOLsumGlob_0 of the first segment (available at the end of ecco_init_varia.F) accessible to other segments.