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About Calculation of MLD from Levitus data



Hello, everyone
 
I want to compute Mixed Layer Depth as the following , but I found there is no any values on the ocean.
 
Is there anyone know what's wrong with the following script file?
---------------------------------------------------------------------------
!MLD=the depth of [T(k=1)-0.5]                
use levitus_climatology                             
define axis/z=0:5000:2/unit=meters z1     
define grid/like=temp/z=z1 gz1                 
let tempz1=temp[g=gz1]
 
let mlda=tempz1[k=1]-0.5
let mldb=tempz1-mlda
let mld=mldb[z=@loc:0]
set var/title="Mixed Layer Depth"/units="meters" mld
contour mld
go fland
frame/file=d:\ferret\MixedLayerDepth0.gif
----------------------------------------------------------------------------------
 
 
Gaorz

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