## Contents

## 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