In order to investigate further the difference between IRT recordings and subsurface 

 temperatures a coordinated air/sea test was arranged with the U. S. Bureau of Commerical 

 Fisheries. A transect was set up on the outer edge of the Shelf south of Block Island which 

 would be readily accessible to both a Coast Guard UF2G aircraft from Brooklyn, New York 

 and the Albatross IV, the research vessel of the Biological Laboratory of the Bureau of Com- 

 mercial Fisheries at Woods Hole, Mass. Shipboard surface temperatures were to be recorded 

 by the Albatross IV and IRT micro-surface temperatures by the UF2G. 



The transect was approximately 30 nautical miles in length extending along the 71° 

 07' W meridian from latitude 40" 30' N to latitude 39° 59.7' N. Depth varied from approxi- 

 mately 250 feet at the northern end to more than 900 feet at the southern end of the transect. 



On the morning of December 13, 1963 a rendezvous was made at the center of the tran- 

 sect. The Albatross IV began at the northern end of the transect at 0850 hours. From 0900 to 

 completion at 1300, surface temperatures were recorded every 15 minutes with a Hytech re- 

 cording bathythermograph. Standard B. T. casts were made at one-half hour intervals. The 

 airborne survey began at 1115 hours. By 1155 hours the UF2G had completed two flights 

 along the transect. Surface temperatures obtained with infrared thermometer were approxi- 

 mately four degrees lower than those recorded by the Albatross IV (Figure 5). The IRT re- 

 corded a temperature range of 46° to 48° F. while surface temperatures from the Albatross IV 

 varied from 50.4° to 52.7°F. 



< 



c 

 111 



a. 

 Z 



40''30 



40°20 40*10 



LATITUDE 



40° 00 



Figure 5. Surface temperature comparisons from near simultaneous records of Albatross 

 IV and airborne IRT. Continuous recording B. T. temperatures from Albatross 

 IV are shown as both absolute plot and superimposed on plot of IRT micro- 

 surface readings for better comparison 



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