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Dear Mr.Ian,

     Recently, I examined an individual native salinity tracer grid at a deeper layer without surface forcing in the North pacific but still cannot close its budget.

Firstly, thank you for your help and let me understand it in a better way. I chose a tracer grid (171.5 E, 29.24N, i=30,j=70,k=21). Its salinity tendency is dominant by the meridional advection terms, which can be proved by using the 3-day S average tendency terms from “nctiles_tendencies”. But the sum of advection and diffusive flux terms using the natural data is much larger than the salinity tendency, according to the forced Advection-diffusive equation(unit: psu/month).

For the tracer cell, there are 6 advection terms and 8 diffusive terms in the 'x‘, 'y', 'z' dimension direction. The differences of advection and diffusive terms between the Eastern/Northern/Upper face and the Western/Southern/Deeper one were calculated and get the sum of their forced terms (Unit: psu.m^3/s).

In order to get the same unit of Salinity budget which is in "psu/month", the right hand side was divide by RAC(grid cell area, m^2) and DRF(vertical grid spacing, m), and multiply by the 86400s *24h *30days. As a result, the right hand is 10^2 times larger than the left, and the meridional advection difference is too large.

I can’t deal with why the cell grid salinity budget is not close, because I have paid attention to their tracer or velocity locations or distances. So could you give me some suggestion that I have ignored and point out my mistakes?

Thank you for your patient reading so much! I really appreciate your help!

Best regards,

Guancheng

 


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