The zonal anomaly distribution in February is shown in figure 13 . 

 The isopleths shift considerably in some areas, but the water masses are 

 basically the same as shown in figure 12; therefore, zonal anomalies for 

 other months were not plotted. The two charts (February and August) 

 satisfy the purpose of illustrating general distribution of water types. 



FIGURE 13 ZONAL ANOMALY OF SEA SURFACE TEMPERATURE IN FEBRUARY (°F) 



In boiondary areas, the surface transition between warm and cold 

 water masses is often q.uite marked. This is not true in subsurface 

 waters at the usual depths of the seasonal thermocline. Extensive 

 tongues of cold and warm water penetrate each other over wide transition 

 areas. Distribution of temperatiure and other variables in such boundary 

 areas is extremely complicated, and satisfactory prediction cannot be 

 expected for the time being. However, some periodicity of interchanging 

 masses may be detected as more data become available. One of the most 

 renowned of such areas is approximately indicated by the shaded portion 

 of figure 12 . 



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