Re: [ExternalEmail] [ferret_users] Thermal expansion coefficient

[Russ Fiedler <russell.fiedler@xxxxxxxx>]

Hi Zuebin,

I can't spot one there but you could probably construct something quite easily by using finite differences.

e.g.

let eps = 1.e-6
let dens = rho_un(salt,temp,p)
let dens_ds =(rho_un(salt+eps,temp,p)-rho_un(salt-eps,temp,p))/(2*eps)
let dens_dt =(rho_un(salt,temp+eps,p)-rho_un(salt,temp-eps,p))/(2*eps)

let alpha = -dens_dt/dens

etc.

I've no idea how good this is though.

Russ

On 17/02/17 10:53, Xuebin.Zhang@xxxxxxxx wrote:

Dear all,

 

I am wondering whether Ferret can calculate thermal expansion coefficient (alpha) of sea water. Is there some subroutine available like the “rho_un” for density?

Thanks!

 

Regards,

Xuebin