Consecutive daily sea siirface temperature charts show frequent abrupt 

 changes in their isotherm patterns. Experience indicates that the major- 

 ity of such changes arise from data errors, data distribution, and the 

 analyst's concepts of temperature variation in the sea. Indeed, identical 

 data on successive charts can be variously interpreted (Figure 2). 



(A) 



(B) 



FIGURE 2 TWO INTERPRETATIONS OF A TEMPERATURE 

 FIELD FROM INDENTICAL DATA 



If one assumes the surface system to be alternate parallel vara and 

 cold water bands (Figure 3)# data distribution on successive charts may 



FIRST DAY 



SECOND DAY 



FIGURE 3 SURFACE TEMPERATURE (WAVE) PATTERNS DEDUCED FROM 

 DIFFERENT DATA DISTRIBUTION IN ALTERNATE PARALLEL 

 CURRENTS IN THE SAME AREA ON SUCCESSIVE DAYS 



