[MITgcm-support] About "addmass" in MITgcm

[Dimitris Menemenlis]

Are you trying to add mass at the surface only, or throughout the water column?  If at the surface only, you can use “realfreshwater” mode and prescribe evaporation and precipitation instead, which would take care of adding mass correctly.  To avoid impact of evaporation and precipitation on salinity, you could set salinity of your domain to zero.

> On Apr 2, 2025, at 11:05 PM, 赖六娃 <yhlai at pku.edu.cn> wrote:
> 
> Dear MITgcm-ers,
> 
> I’m trying to include a mass-loading forcing in ocean circulation simulations.
> The 3D distribution of Evaporation/Condensation rate E in kg/m2/s is known. I’m testing its influence on ocean circulation.
> Note that I only want to consider the Evaporation effect on mass loss and gain, and not consider its influence on salinity.
> So, in my model setup, I multiply E*dx*dy to make it in unit of kg/s.
> I set: addMassFile='addmass_160x72x44.bin’,  and also #define ALLOW_ADDFLUID <http://lxr.mitgcm.org/lxr2/ident/MITgcm?_i=ALLOW_ADDFLUID> in code/.
> However, I did not see its influence on circulation, I’m not sure if I set correctly.
> And let me make sure that negative addmass means mass source, and vice versa?
> 
> Best regards,
> 
> Yanhong
> 

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