[MITgcm-support] Thermodynamical sea ice growth and brine production

[Polona Itkin]

Dear mailing list,

I m interested in the polynya sea ice production. I d need something like thermodynamical sea ice growth to estimate the volume/winter. I ve found the following diagnostics:
   277 |SIdHbOCN|  1 |       |SM      M1|m/s             |HEFF rate of change by ocean ice flux
   280 |SIdHbATC|  1 |       |SM      M1|m/s             |HEFF rate of change by atm flux over sea ice
   281 |SIdHbATO|  1 |       |SM      M1|m/s             |HEFF rate of change by open ocn atm flux
   282 |SIdHbFLO|  1 |       |SM      M1|m/s             |HEFF rate of change by flooding snow
If i sum up all of them i think i ll get what i want.

Then i m also interested into the amount of salt that is rejected to the ocean during the sea ice thermodynamical growth. I m using free linear surface and rstar, so technically that would be converting the thermodynamical growth to the freshwater flux. The volume of water from which sea ice is formed is removed from the ocean and the remaining ocean volume has more salt/volume.

There is already a diagnostic called
266 |SIempmr |  1 |       |SM      U1|kg/m^2/s        |Ocean surface freshwater flux, > 0 increases salt
and i could use it as some sort of estimate (or checkup) - because it also contains river runoff and evaporation (none of which takes much part in my region/period of interest). But in seaice_growth.F only SIdHbOCN SIdHbATO go to the precipitation. Why not also the other two (SIdHbATO and SIdHbFLO)? Maybe i ve missed something.

Further more there are:
    90 |SRELAX  |  1 |       |SM      U1|g/m^2/s         |surface salinity relaxation, >0 increases salt
and
    94 |SFLUX   |  1 |       |SM      U1|g/m^2/s         |total salt flux (match salt-content variations), >0 increases salt
Which should be the same, but are not. Is there any other ocean surface salt flux, but restoring?
I need to take the restoring term into account to see what kind of salt flux/fw flux effect the polynya has.

Thank you for your answers!

Cheers, Polona


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mitgcm.org/pipermail/mitgcm-support/attachments/20130430/f6849b6e/attachment.htm>