mixed-layer pressure (75-term equation)



mlp = gsw_mlp(SA,CT,p)


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". 


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.


mlp  =  mixed-layer pressure                                      [ dbar ]


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 =


Paul Barker and Trevor McDougall                      [ ]


3.06 (27th May, 2016)


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,
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.
The software is available from
Provider: John Wiley & Sons, Ltd