Bermuda. All told, four sets of comparative measurements were made, three over ships 

 and one over the tower. A number of field measurements were made also to test ART re- 

 liability over areas of strong and weak surface temperature gradients. 



A. Measurement Reliability 



On 18 July 1962, the ART was flown along a triai^ular path. Figure 1 shows the re- 

 sults of the temperature-distance profile comparison of ART observations and the ASWEPS 

 sea surface temperature chart for two successive flights. Comparison of the temperature 

 profiles indicate good agreement. Figures 2 and 3 show an example of measurement reli- 

 bility of ART data taken 7-8 November 1962. In this example, a second flight was scheduled 

 over a triangular flight path 10.5 hours after the first. A section of the analog recording 

 has been reproduced from both flights over a portion of the route where the flight tracks 

 were identical. An inspection of both traces shows excellent agreement and presents evi- 

 dence of the instrument's ability to reproduce field measurements. 



B. Measurement Accuracy 



On 25-26 January 1963, the USCGC CASCO made measurements of sea surface tem- 

 perature between Boston and Ocean Weather Station ECHO. The area between Boston and 

 the Gulf Stream contains strong surface temperature gradients. Continuous measurements 



COMPARISON OF 2-HOUR TEMPERATURE CHANGES, 18 JULY 1962 

 WITH SYNOPTIC ANALYSIS 



SYNOPTIC ANALYSIS OF SEA SURFACE TEMPERATURES 

 SHOWING ART FLIGHT TRACK 



Figure 1. Synoptic analysis of sea surface temperatures in comparison 

 with IRT flight records, July 18, 1962 



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