Re: how to specify temperature and salinity corresponding to acertaindensity.

[Ansley Manke <ansley@xxxxxxxxxxxxx>]

Hi everyone,
Here's a solution to the question that one of our users sent in:

!       Here is a way based on the rho_un function supplied with ferret

DEF AXIS/X=25:29:0.25 xax
LET temp=x[gx=xax]        ! the temp range you want
DEF AXIS/Y=35:40:0.01 yax
LET salt=y[gy=yax]        ! guess at salinity range

SET MODE interp
LET sig0=RHO_UN(salt,temp,0)-1000
LET salt25=sig0[y=@loc:25]

PLOT salt25 ! if solution not found for the full range of temperatures
            ! modify the y-axis (salt) range and try again. Then
            ! confirm result

LIST/NOHEAD/FORM=(F7.2,2F10.5) temp,salt25,rho_un(salt25,temp,0)-1000

   25.00  37.19096  25.00000
   25.25  37.29274  25.00000
   25.50  37.39516  25.00000
   25.75  37.49823  25.00000
   26.00  37.60209  25.00000
   26.25  37.70662  25.00000
   26.50  37.81194  25.00000
   26.75  37.91787  25.00000
   27.00  38.02443  25.00000
   27.25  38.13177  25.00000
   27.50  38.23984  25.00000
   27.75  38.34855  25.00000
   28.00  38.45790  25.00000
   28.25  38.56807  25.00000
   28.50  38.67887  25.00000
   28.75  38.79033  25.00000
   29.00  38.90246  25.00000

Namba Takaya wrote:

> Dear Sir
>
> If we have given water density (for example 25 Sigma-0), how we could get
> to know the conbination of sea temperature and salinity?
> Of course, I know that there are unlimited conbination of temperature and
> salinity. For example, with given
> 25,25.25,25.5,25.75,26,26.25,26.5,26.75,27,27.25,27.5,27.75,28,28.25,28.5,28.75,29
> degree of temperature, how I can get the salinity corresponding to 25
> Sigma-0 respectively.
>
> Thank you in advance.
>
> Takaya Namba
>
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--
Ansley Manke  Pacific Marine Environmental Laboratory  Seattle WA  (206)526-6246