# gsw_grav

    Gravitational acceleration

## Contents

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

## USAGE:

    grav = gsw_grav(lat,{p})

## DESCRIPTION:

    Calculates acceleration due to gravity as a function of latitude and as
    a function of pressure in the ocean.

    Click for a more detailed description of the
    gravitational acceleration.

## INPUT:

    lat  =  latitude in decimal degress north                [ -90 ... +90 ]

    OPTIONAL:
    p    =  sea pressure                                            [ dbar ]
              (ie. absolute pressure - 10.1325 dbar)
    (If pressure is not given then it is assumed that pressure = 0 dbar).

    p (if provided) may have dimensions 1x1 or Mx1 or 1xN or MxN,
    where lat is MxN.)

## OUTPUT:

    grav  =  gravitational acceleration                            [ m/s^2 ]

## EXAMPLE:

    lat = [ -90; -60; -30; 0;]
    p   =    0;

    grav = gsw_grav(lat,p)

    Note. If the pressure is zero then the following is also valid

    grav = gsw_grav(lat)

    grav =

     9.832186205884799
     9.819178859991149
     9.793249257048750
     9.780327000000000

## AUTHOR:

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

## VERSION NUMBER:

    2.0  (23rd July, 2010)

## REFERENCES:

    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 appendix D of this TEOS-10 Manual.

    Moritz (2000) Goedetic reference system 1980. J. Geodesy,74,128-133.

    Saunders, P.M., and N.P. Fofonoff (1976) Conversion of pressure to
     depth in the ocean. Deep-Sea Res.,pp. 109 - 111.

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