SST

[jafar1979]

Model's SST in cold and warm regions, got much more colder and warmer results, respectively, by passing time . SWRAD, SHFLUX,SWFLUX,WINDSTERSS and RIVER are all forced which are used. About model's setup there are:

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 DX=3.3 km 
        TNU2 == 50.0d0  50.0d0                    ! m2/s
        VISC2 == 10.0d0     
        TNUDG == 0.0d0  0.0d0               ! days
        ZNUDG == 0.0d0                      ! days

and TS_MPDATA is active in header file.
what is your recommendation to correct model result?
ALSO What is the appropriate value for TNUDG when model has been ran for 3 years?

[kate]

You might consider adding the dQdSST term to your forcing.

TNUDG is confusing in that it is used as both a nudging time scale for open boundary conditions and for climatology nudging (unless you change ana_nudgcoef.h). Also confusing is that setting TNUDG to zero does not make for hard clamping (short time scale) due to this:

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!  Compute inverse nudging coefficients (1/s) used in various tasks.
!
          IF (Tnudg(itrc,ng).gt.0.0_r8) THEN 
            Tnudg(itrc,ng)=1.0_r8/(Tnudg(itrc,ng)*86400.0_r8)
          ELSE 
            Tnudg(itrc,ng)=0.0_r8
          END IF

Instead, it turns off the nudging.

[jafar1979]

1-It seems ROMS want dQdSST just when ever QCORRECTION has been defined in header file. Is it true?
2- Does it need SST data(as well as dQdSST) under this circumstances ( #define QCORRECTION)?

[kate]

Yes to both. For dQdSST you need to provide the reference SST used when computing Q and dQdSST.

[jafar1979]

you need to provide the reference SST used when computing Q and dQdSST

If your mean about Q is surface net heat flux, i have computed it by sum of surface sensible heat flux, surface latent heat flux, surface net solar radiation (shortwave) and surface net thermal radiation (longwave) not SST?

[kate]

Some of those terms you list are a function of SST, especially longwave up.