[MITgcm-support] Forcing a surface fresh water flux with EmPmRFile

Marion Alberty marion.s.alberty at gmail.com
Tue Jan 12 15:28:14 EST 2021

Hello all,

I am trying to run a channel model configuration where I have a cold, freshwater input over half the domain that is constant in time. To do this I have turned on EmPmR with 
EmPmRFile       = 'M_dT5e+00C.bin’,
The file is a 2-D array of flux values in m/s where values<=0 to indicate the addition of freshwater to the system.

I also want my surface fresh water flux to have a temperature of 0 deg C so I include this line in my data file:

Over the first 5 days, salinity in the surface layer looks ok, with values of 0 psu, however salinity in the top grid cells become increasingly negative after this point. At the same time, the temperature of the surface layer in the region of forcing drops below 0 deg C after a day or so becoming unrealistically cold (-15 deg C) by day 5. 

If any one can offer some guidance for where I’ve gone wrong, I would greatly appreciate it. The full set up for the simulation can be found here:
https://github.com/marionalberty/MITgcm/tree/front_relax_SODA2/verification/front_surfFlux_highres <https://github.com/marionalberty/MITgcm/tree/front_relax_SODA2/verification/front_surfFlux_highres>

Thanks in advance for any assistance,

Marion Alberty (she/her), Ph.D.
Postdoctoral Research Associate
Princeton University
NOAA Geophysical Fluid Dynamics Laboratory

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