Subgrid mixing: ideas for enhancements

[sjboeing]

• Vorticity inversion at higher resolution (note, this does not require space-filling like the buoyancy field does).

• Enhanced (stochastic) merging and splitting

• Parcels with a dilution factor, which slowly grow in volume, keeping product volume*dilution. Merging based on dilution as well as other factors. Dilution/expansion rate informed by physics of mixing.

• Parcel nudging to gridded field values with time-scale representing subgrid mixing.

• Andy Visser's book on zooplankton ecology (! Chapter 4), provides a nice perspective to mixing, I think.
  https://www.researchgate.net/publication/280883339_Small_wet_rational_Individual_based_zooplankton_ecology

• See also figure 5 in http://authors.library.caltech.edu/1349/1/DIMjfm00.pdf