D. OCEANOGRAPHIC CASTS 



Forty- three Nansen casts were made, including five deep casts and 

 representing 645 data points each of temperature, salinity, and computed 

 sigma - t and sound velocity. The data are presented in Appendix III. 



E. METEOROLOGICAL DATA 



These data were obtained with standard meteorological instrumentation. 



1. Air temperatures - 216 hours of wet and dry bulb data 

 were obtained. 



2. Winds - Wind speed and direction were measured at the 

 mast and bow. The bow-height sensor measured wind speed on a continuous 

 basis. 



3. Radiation - Continuous recordings were made using five 

 pyrheliometers and one flat-plate radiometer. 28,800 data points were 

 obtained with the pyrheliometers and are presented in Appendix VI. 



V. SHIPBOARD DATA REDUCTION 



Data reduction and processing were successfully completed aboard a 

 Navy oceanographic vessel for the first time. Six hour watches were 

 maintained continuously in the data center established aboard the 

 USS SAN PABLO. Meteorological data, mechanical BT's, ocean casts, and 

 thermistor chain data were encoded and key punched onto IBM cards. 

 The data were checked and verified aboard ship and publication listings 

 obtained upon return to HYDRO. 



VI. PRELIMINARY EXAMINATION OF OCEANOGRAPHIC DATA 



The Tongue of the Ocean is widely recognized for its unique features, 

 particularly with respect to size, shape, and depth. To what extent the 

 geometry of the Basin completely influences the physical properties is 

 not known. However, the distribution of these physical properties is 

 apparently influenced by changing climatic conditions, prevailing 

 meteorological situations, and the oceanographic circulation patterns 

 east of the Bahamas. Local changes, particularly internal water move- 

 ments, appeared to be related directly to the configuration of the ocean 

 basin. 



A. CURRENTS 



To determine the circulation pattern in the Tongue of the Ocean, 

 density currents were computed relative to the 300-meter level. Com- 

 parison of these currents with actual hourly observations taken during 

 the period 9 to 13 March at the moor show excellent agreement. Analyses 

 of dynamic current data indicate a circulation pattern in which water 



