FOREWORD 



DEEP FREEZE 63 and 64 were the ninth and 

 tenth consecutive United States expeditions in 

 support of Antarctic research. Personnel of the 

 U. S. Naval Oceanographic Office, supported by 

 the National Science Foundation, conducted ocean- 

 ographic research from two icebreakers assigned to 

 TASK FORCE 43. Oceanographic data were obtained 

 throughout the Ross Sea. 



A discussion of the distribution of water 

 masses present in the Ross Sea during the austral 

 summer is presented in this report. Tabulations 

 of the Nansen cast data collected during the two 

 cruises are included with some analysis of these 

 data. 



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0. D. WATERS, JR. 



Rear Admiral, U. S. Navy 



Commander 



