PRESENTATION OF PAPERS 



In this section are given the title of the paper presented by each contributor, a 

 resume of the oral presentation of each speaker, and an approximate account of the ensuing 

 discussion. The complete text of each contribution is given in part 2 — Contributions. 



Kirby L. Drennan: Infrared Survey Technique as a Means of Determining 

 Mississippi River Discharge Patterns and Surface Flow Along the Northern 

 Gulf Coast. 



The Gulf CoasL Research Laboratory is conducting a monthly aerial temperature 

 survey along the northex'n coast of the Gulf of Mexico. The primary objective of the survey 

 is to determine the variations in Mississippi River discharge patterns and surface currents 

 in the area. The survey is conducted from Grumman Albatross aircraft provided by the 

 U. S. Coast Guard and U. S. Navy. Temperature measurements are made with a Barnes 

 Model IT-2S radiation thermometer and recorded along with input voltage on a dual-pen 

 strip chart recorder. A field test was conducted from a tower off Panama City, Fla., in an 

 effort to determine reliability of the radiometer under varying atmospheric conditions. 



The isotherm patterns obtained, along with drift bottle recovery data from inflight 

 releases, have provided a more comprehensive description of surface flow over the area. 

 It is suggested that during the winter and spring months, when surface temperature gradi- 

 ents are strong, greater errors may be introduced by navigational inaccuracies than by 

 instrument inaccuracies. Navigational instruments used include Loran-A, Tacan, and 

 Radar. 



In discussion Mr. Drennan mentioned that calibration checks in the laboratory 

 showed a maximum error of 0.7°F. in the instrument as delivered from the factory. 

 Regular inflight checks of the instrument calibration were made. In actuiil use a maximum 

 variation of 2.0°F. was noted between surface immersion thermometer readings and the 

 IRT, and most of this was thought to be due to expected differences between microsurface 

 and immediate subsurface temperature. 



Guy A. Franceschini; Some Factors Influencing the Skin- Temperature of the Sea 

 and Its Measurement by Infrared Thermometer. 



Dr. Franceschini described his experience in continuous IRT surface temperature 

 measurement during three traverses between Africa and Antarctica during Spring 1963. 

 The work was done aboard the M/V OB during the 8th Soviet Antarctica Expedition. Over 

 a wide range of oceanographic and meteorological conditions, differences as high as 5 ' to 

 6°C. were oljserved between IRT and towed thermistor readings. The greatest variations 

 were recorded after heavy rainfall on the ocean in the Antarctic where the surface "skin", 

 or microsurface, was much warmer than the immediate subsurface. The differences were 



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