<i76 EIGHTH PACIFIC SCIENCE CONGRESS 



back into the Pacific in the northern half of the Strait joined by waters 

 from the China Sea eddy. 



Sulti Sea. During the investigations of Philippine waters four sur- 

 veys of the Sulu Sea were made: two during the northeast monsoon and 

 two during the southwest monsoon. The circulation patterns found 

 during the first two surveys (one in each season) have already been re- 

 ported (Graham, 1952). The present charts present the results of two 

 more surveys, one in each season. 



Comparing the results of the second northeast monsoon survey 

 (Chart I) with those of the first northeast monsoon survey (Chart II; 

 Graham, 1952), we find that the general current pattern is similar al- 

 though apparently somewhat simpler. There is the same indication of 

 westward flow from the Mindanao Sea. Within the Sulu Sea the general 

 pattern is that of a large counter clockwise eddy. This eddy probably 

 corresponds to the "South Central Eddy" found during the first survey 

 of this Sea in October and December, 1947. 



The currents indicated by the second southwest monsoon survey 

 conducted in March and April 1949 (Chart II) also compare well with 

 those found during the first survey made during the southwest monsoon 

 made in June and July 1918 (Chart V, Graham, 1952). In 1948 the out- 

 standing feature of the surface currents in the Sulu Sea was a flow of 

 water from the South China Sea between Palawan and Borneo. This 

 water flo^ved northeastward along the east coast of Palawan in a direc- 

 tion opposite to the flow characteristic of the northeast monsoon. The 

 results of the 1949 survey (Chart II) show this same movement of water 

 in that area of the Sulu Sea. In 1948 some of the water flowing in from 

 the China Sea turned southward. This same movement was found in 

 1949 although more of it was deflected westward to form a small eddy. 

 In 1949 the North Central Eddy dominated the central area of this Sea 

 while in the 1948 survey both of the major eddies were well developed. 



References 



Graham, Herbert W. 1952. A contribution to the oceanography of the Sulu 

 Sea. Proc. Seventh Pacific Science Congress, v. 3, 225-266. 



SCHOTT, G, 1939. Die "aquatorien Stromunger des westliclten Stillen 

 Ozeans. Ami. d. Hydrogr. u. Mar. Meterol. v. 67, 247-257. 



SvERDRUP, H. U., M. W. Johnson and R. H. Fleming. 194^. Tlie oceans. 

 1,087 pp. New York. ^ 



