# gsw_t90_from_t48

    ITS-90 temperature from IPTS-48 temperature

## Contents

- USAGE:
- DESCRIPTION:
- INPUT:
- OUTPUT:
- EXAMPLE:
- AUTHOR:
- VERSION NUMBER:
- REFERENCES:

## USAGE:

    t90 = gsw_t90_from_t48(t48)

## DESCRIPTION:

    Converts IPTS-48 temperature to International Temperature Scale 1990
    (ITS-90) temperature. This conversion should be applied to all in-situ
    data collected prior to 31/12/1967.

    Click for a more detailed description of calculating
    ITS-90 temperature from IPTS-48 temperature.

## INPUT:

    t48   =  in-situ temperature  (IPTS-48)                        [ deg C ]

## OUTPUT:

    t90   =  in-situ temperature  (ITS-90)                         [ deg C ]

## EXAMPLE:

    t48 = [ 29 28 23 10 7 4]

    t90 = gsw_t90_from_t48(t48)

    t90 =

      28.9840
      27.9844
      22.9867
       9.9936
       6.9955
       3.9974

## AUTHOR:

    Paul Barker & Trevor McDougall     [ help_gsw@csiro.au ]

## VERSION NUMBER:

    2.0 (23rd July, 2010)

## REFERENCES:

    International Temperature Scales of 1948, 1968 and 1990, an ICES
     note, available from http://www.ices.dk/ocean/procedures/its.htm

    IOC, SCOR and IAPSO, 2010: The international thermodynamic equation of
     seawater - 2010: Calculation and use of thermodynamic properties.
     Intergovernmental Oceanographic Commission, Manuals and Guides No. 56,
     UNESCO (English), 196 pp.  Available from the TEOS-10 web site.
      See section 2.1 and appendix A.1 of this TEOS-10 manual.

    The software is available from http://www.TEOS-10.org