Hello CF

We have a requirement to calculate volume integrals for a large range of model 
diagnostics.  We would like a method to correctly identify these derived fields.

I am interested in creating a new cell_method, an integral, which would allow 
us to use this approach with any standard name.

Such a cell method will necessarily alter the units of the quantity by a factor 
dependent on the dimensions integrated over.

For example, I would like to store a data variable:

double deltaSeaIron(time, depth, lat, lon)
    deltaSeaIron:standard_name = 
"tendency_of_mole_concentration_of_iron_in_sea_water_due_to_biological_production"
 ;
    deltaSeaIron:units = "mol s-1" ;
    deltaSeaIron:cell_methods = "depth: lat: lon: integral" ;

I would very much value initial feedback from the community on these thoughts 
before I raise a ticket suggesting a change.

thank you
mark


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