DELTA 



I 



DELTA 



II 



DELTA 



III 



DELTA 



IV 



DELTA 



V 



ECHO 



I 



ECHO 



II 



ECHO 



V 



TABLE 1 



SUMMARY OF OCEAN WEATHER STATION CRUISES 



June 1962 



September-Octotier I962 

 November-December I962 

 March-April I963 

 June -July I963 

 November 1958 

 February-March 1959 

 January-February 1963 



Bucket thermometers were calibrated before each cruise to insure 

 accuracy of .1°F. Two bucket thermometers were used during DELTA 

 I, II, and III, Procedure called for measuring the temperature of 

 a bucket of surface water with two bucket thermometers. Whenever 

 the two instruments disagreed by more than .2°F, both thermometers 

 were replaced. During DELTA I, II, and III the thermometers re- 

 mained in the bucket for as much as k minutes while the BT was low- 

 ered and recovered. During DELTA V and ECHO V a single bucket ther- 

 mometer was read after stabilizing for about 30 seconds. During 

 DELTA IV and ECHO V the U5CGC CASCO was outfitted with special therm- 

 istor probes 3 feet below the water line (reference 6). Probe readings 

 were used as reference temperatures. 



Temperature meaeurements by use of reversing thermometers and 

 BT's were made according to procedures outlined in reference 7» 

 Half -hourly BT observations and 6-hourly Nansen casts were taken 

 during all cruises. A cast normally requires 1 to 1^ hours to com- 

 plete. The BT schedule was interrupted during Nansen casts and was 

 resumed on completion of each cast. 



BT sea surface temperatures were checked against bucket temper- 

 atures. The two values generally agreed within a few tenths of a 

 degree. Whenever the two disagreed by a few degrees, the BT was 

 replaced. The BT was also replaced when the surface depth error 

 exceeded kO feet or when the BT trace showed hysteresis. 



Recorded temperatures of reversing thenaometers were generally 

 an average reading of two instruments. However, if a pair of in- 

 struments disagreed by more than .06°C, the most plausible tem- 

 perature was accepted. In some cases, when the protected thermom- 

 eter was paired with an unprotected thermometer, only one reading 

 was available. 



Table 2 shows the numbers of sea surface temperature observations 

 recorded by reversing thermometers on each cruise. The percentage 

 of observations which were aversiged from two thermometers are also 

 indicated. 



