date_sample  lat    lon    mixed_layer_depth  
20050112     -20    210    29                 
20050115     -26    210    12                 
20050118     -31    210    25                 
20050121     -36    210    32                 
20050124     -41    210    45                 
20050126     -44    210    29                 
20050128     -47    210    57                 
20050130     -50    210    80                 
20050201     -53    210    63                 
20050202     -55    210    75                 
20050202     -56    210    69                 
20050204     -59    210    69                 
20050206     -62    210    70                 
20050208     -65    210    69                 
20051023     7      -155   nd                 
20051214     -8     -155   nd                 
20060609     -7     -155   nd                 
2010         -46    -77    nd                 
2010         -36    -74    nd                 
2010         -33    -72    nd                 
2010         -32    -73    nd