[Thread Prev][Thread Next][Index]
Re: [ferret_users] potential temperature to in situ temperature conversion
Yes.
- It is very simple to convert potential to in situ temperature.
- To do so, you only have to use the THETA_FO function
- For details, see the message below, sent to the list last year
Ansley, might you be able to document this feature in the next version
of the Ferret users guide?
Many thanks,
Jim
---------- Forwarded message ----------
From: James Orr <James.Orr@xxxxxxxxxxxx>
To: Ferret UserGroup <oar.pmel.ferret_users@xxxxxxxx>
Date: Thu, 23 Apr 2009 09:11:18 +0200 (CEST)
Subject: Re: HOw to convert potential temperature to in-situ
temperature?
To convert from potential temperature to in-situ temperature it is very
easy. It can be done using the existing Ferret function that does the
opposite.
As documented in the Ferret user manual, the function THETA_FO is
designed to convert from in-situ temperature to potential temperature
(only). The arguments are
THETA_FO( salt, temp, P, P_reference)
What is undocumented in the manual is that to do the opposite (convert
in-situ to potential temperature), we only need to inverse the 3rd and
4th arguments. For example
let Tpot = theta_fo(35,20,5000,0)
let Tinsitu = theta_fo(35,19,0,5000)
list Tpot, Tinsitu
! Results should be Tpot=19 and Tinsitu=20
This might be useful for some, e.g., ocean modelers who typically store
out potential temperature fields but sometimes need in-situ temperature
in post-treatments. It would be nice if this currently undocumented
feature of THETA_FO would be added to the user's manual.
Thanks,
Jim
-----------------------------------------------------------
Old unanswered Question from Ferret archive:
-----------------------------------------------------------
* To: ferret_users <ferret_users@xxxxxxxxxxxxxxxxxxx>
* Subject: HOw to convert potential temperature to in-situ
temperature?
* From: Yang Kun <yangk@xxxxxxxxxxxxxx>
* Date: Fri, 25 Feb 2000 15:13:43 -0600 (CST)
* Sender: owner-ferret_users@xxxxxxxxxxxxxxxxxxx
HI, all
I know theta_fo can calculate potential temperature.
Is there also a fuction to do the contrary thing in ferret?
Or, I have to write Fortran to do this?
Thanks.
yours,
Kun
On Thu, 11 Feb 2010, David Wang wrote:
Hi Ferreters,
Is there a simple way to convert potential temperature (usually from ocean
model output) to in situ temperature, sort of like the inversion of the
function THETA_FO?
Thanks,
David
--
Daiwei Wang
Department of Earth and Environmental Sciences and
Lamont-Doherty Earth Observatory
Columbia University
======================================================================
James Orr
LSCE/IPSL, Laboratoire des Sciences du Climat et de l'Environnement
CEA-CNRS-UVSQ
LSCE/IPSL, CEA Saclay http://www.ipsl.jussieu.fr/~jomce
Bat. 712 - Orme mailto: James.Orr@xxxxxxxxxxxx
Point courrier 132
F-91191 Gif-sur-Yvette Cedex Phone: (33) (0)1 69 08 39 73
FRANCE Fax: (33) (0)1 69 08 30 73
======================================================================
[Thread Prev][Thread Next][Index]
Contact Us
Dept of Commerce /
NOAA /
OAR /
PMEL /
TMAP
Privacy Policy | Disclaimer | Accessibility Statement