# gsw_mlp

    mixed-layer pressure (75-term equation)

## Contents

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

## USAGE:

    mlp = gsw_mlp(SA,CT,p)

## DESCRIPTION:

    Calculates the mixed-layer pressure as described in de Boyer Montégut
    et al. (2004).  The mlp is always deeper than 20 dbar, if the initial
    estimate of the mlp is less than 20 dbar, the temperature and salinity
    of the bottles in the top 5 dbar are set to that of the bottle closest
    to 5 dbar.  This removes the effect if a thin layer of fresh water,
    such as that from a river outflow or from rain.

    Note that the 75-term equation has been fitted in a restricted range of
    parameter space, and is most accurate inside the "oceanographic funnel"
    described in McDougall et al. (2003).  The GSW library function
    "gsw_infunnel(SA,CT,p)" is avaialble to be used if one wants to test if
    some of one's data lies outside this "funnel".

## INPUT:

    SA  =  Absolute Salinity                                          [ g/kg ]
    CT  =  Conservative Temperature (ITS-90)                         [ deg C ]
    p   =  sea pressure                                               [ dbar ]
           (ie. absolute pressure - 10.1325 dbar)

    SA & CT need to have the same dimensions.
    p may have dimensions 1x1 or Mx1 or 1xN or MxN, where SA & CT are MxN.

## OUTPUT:

    mlp  =  mixed-layer pressure                                      [ dbar ]

## EXAMPLE:

    SA = [34.7118; 34.8915; 35.0256; 34.8472; 34.7366; 34.7324;]
    CT = [28.7856; 28.4329; 22.8103; 10.2600;  6.8863;  4.4036;]
    p =  [     10;      50;     125;     250;     600;    1000;]

    mlp = gsw_mlp(SA,CT,p)

    mlp =

       50

## AUTHOR:

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

## VERSION NUMBER:

    3.06 (27th May, 2016)

## REFERENCES:

    de Boyer Montégut, C., G. Madec, A.S. Fischer, A. Lazar and D. Iudicone
    2004: Mixed layer depth over the global ocean: An examination of
    profile data and a profile-based climatology, J. Geophys. Res., 109,
     http://dx.doi.org/10.1029/2004JC002378

    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.

    McDougall, T.J., D.R. Jackett, D.G. Wright and R. Feistel, 2003:
     Accurate and computationally efficient algorithms for potential
     temperature and density of seawater.  J. Atmosph. Ocean. Tech., 20,
     pp. 730-741.

    Roquet, F., G. Madec, T.J. McDougall and P.M. Barker, 2015: Accurate
     polynomial expressions for the density and specific volume of seawater
     using the TEOS-10 standard.  Ocean Modelling, 90, pp. 29-43.
     http://dx.doi.org/10.1016/j.ocemod.2015.04.002

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

﻿Provider: John Wiley & Sons, Ltd