[MITgcm-support] On the calculation of the volume conservation from the output of a regional model

[michael schaferkotter]

On 6/13/17 4:31 PM, whale wrote:
>
> If the volume in this water column is conservative, the result of this 
> equation should be 0. However, it is not. I always got a volume 
> residual value at ~0.01.
>
there is no reason to assume that volume is conserved in the single cell 
for which the calculation is made.

the calculations are correct.

> If I chose to calculate a relative larger region, the residual value 
> will also increase and I will get a very large value at last.
>

Not necessarily. perhaps yes for your particular example.
>
> So, my questions are
>
> Whether the equation of my calculation is right or wrong?
>
> If my equation is right, where will the residual volume goes?
>
> Will the residual volume contribute to the changes of ETAN or 
> something else?
>

yes.

do the same calculation for the boundary of your domain and use the 
divergence theorem to calculate the expected sea surface height.

michael


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