represent an interpretation of the distribution of a variable and therefore 

 may be open to dispute. The figures of this report are no exception. 

 However, no observed points are violated and interpolations are gener- 

 ally linear except when boundary conditions suggest a deviation. 



In order to obtain average values of temperature, salinity, etc. , 

 and their spatial trend, the survey region was subdivided into four areas. 

 A line was drawn along the Hawaiian Island chain and another perpendi- 

 cular to it through the western tip of Molokai island, as shown on figure 1, 

 These lines divide the region into a windward (northeast) and a leeward 

 (southwest) side with an east and a west section in each. 



HUGH M. SMITH CRUISE 17 



Summary Cruise Report 



The cruise began September 5, 1952, and was completed Septenn- 

 ber 15, 1952. Figure 1 shows the positions of the 31 hydrographic sta- 

 tions. Water samples were taken to a depth of 600 m. and oblique 200-na. 

 zooplankton hauls were made on each station. Bathythermograph temper- 

 atures to 900 feet were obtained on each station and at 10-mile intervals. 

 Synoptic weather observations were made four times daily and forwarded 

 to the U. S. Weather Bureau. 



Meteorological Conditions 



Typical trade wind weather prevailed during the cruise period. 

 Air temperatures were predominantly 77 F., with the exception of the por- 

 tion southwest of the island chain, where the maximum deviations of + 2 F, 

 occurred and where the tennperatures were generally slightly above 77°F. 

 Winds were generally from 090 + 20 T. with the exceptions of a few sta- 

 tions to the lee of the island chain where the deviation reached a mciximum 

 of + 60 . No winds with a westerly component were observed. Speeds 

 were generally between 15 and 20 knots, with extremes of 6 and 22 knots. 

 No rain was encountered except on stations 8 and 14. 



Surface Hydrography 



The hydrographic conditions of the surface layer (upper 50 to 

 100 m.) are of importance since their variations have a primary 



