[MITgcm-support] Friction velocity ustar in S/R exf_wind.F

[Martin Losch]

Hi Stanislav,

I am no expert on this, but did you see lines 156/157:
             wStress(i,j,bi,bj) = SQRT(usSq)
c            ustar = SQRT(usSq/atmrho)

so ustar should be sqrt(usSq/atmrho). for algorithmic reasons wstress=sqrt(usSq) is computed first and then divided by sqrt(atmrho) later in lin 179. To this makes sense, although it’s not very easy to read.

Martin

> On 4. Mar 2018, at 13:58, Stanislav Martyanov <martyanov.sd at gmail.com> wrote:
> 
> Hello!
> 
> I think it should be
> 
> ustar = SQRT (wStress(i,j,bi,bj) / atmrho)
> 
> rather than
> 
> ustar = wStress(i,j,bi,bj)*recip_sqrtRhoA
> 
> in exf package in S/R exf_winf.F (line 179)?
> 
> In the current version wStress is not affected by the function SQRT,
> but should be, in my opinion.
> 
> Best regards,
> Stanislav
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