Re: [ExternalEmail] Re: [ferret_users] Temperature calculation from potential temperature.

[Manche Shivashankar <mancheshivashankar@xxxxxxxxx>]

Thank you so much for your reply

But in my data set I didn't had pressure data, and if calculate pressure by
p = p0 + rho*g*h ; if I calculate rho by ferret function rho_un(sal,temp,ref_pressure) again temperature is potential temperature
in this situation how should I proceed.

please advice me.

Thanks in advance

shivashankar

On Mon, Oct 31, 2016 at 12:49 PM, Russ Fiedler <russell.fiedler@xxxxxxxx> wrote:

Arrgghh. I got this backwards.

you want the forward calculation.

let temp_insitu = theta_fo(salt, temp_pot , p , p_ref )

or

let temp_insitu = theta_fo(salt, temp_pot , p , 0 )


Sorry about that.

Russ

On 31/10/16 17:56, Russ Fiedler wrote:

Hi,

You need the function THETA_FO with the reversed pressure arguments.

http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/XPRESSIONS#_VPID_113


let temp_insitu = theta_fo( salt, temp_pot , p_ref , p )

where p_ref is the reference pressure for potential temperature (usually zero).

i.e

let temp_insitu = theta_fo(salt, temp_pot , 0. , p )



Cheers,
Russ

On 31/10/16 17:19, Manche Shivashankar wrote:

Dear ferret users,

I have a netcdf file in which potential temperature is one of the parameters.
Now I need tom convert this potential temperature to regular temperature.
How it could be done, Please anyone help me.

Thanks and regards
Shivashankar