# gsw_t90_from_t68

    ITS-90 temperature from IPTS-68 temperature

## Contents

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

## USAGE:

    t90 = gsw_t90_from_t68(t68)

## DESCRIPTION:

    Converts IPTS-68 temperature to International Temperature Scale 1990
    (ITS-90) temperature.  This conversion should be applied to all in-situ
    data collected between 1/1/1968 and 31/12/1989.

    Click for a more detailed description of calculating
    ITS-90 temperature from IPTS-68 temperature.

## INPUT:

    t68   =   in-situ temperature  (IPTS-68)                       [ deg C ]

## OUTPUT:

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

## EXAMPLE:

    t68 = [ 29; 28; 23; 10; 7; 4;]

    t90 = gsw_t90_from_t68(t68)

    t90 =

      28.993041669999190
      27.993281612413014
      22.994481324482116
       9.997600575861791
       6.998320403103254
       3.999040230344716

## AUTHOR:

    Paul Barker and Trevor McDougall                    [ help@teos-10.org ]

## VERSION NUMBER:

    3.05 (16th February, 2015)

## 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