Oce anographic Conditions 



Observations made at all stations of the water temperatures, specific 

 gravities, and hydrogen ion concentrations at the surface , 25 meters, 100 

 meters, 200 meters, and 300 meters showed the following conditions? 



(l) Temperatures 



The distribution of sea water temperatures in the various areas 

 during the period of this investigation was almost perfectly uniform, with 

 very similar readings at each level„ Surface temperatures were from 28„3 

 to 29o0 degrees, at the 25-meter depth from 28,5 to 29,0 degrees, at 50 

 meters 2B,U to 29.0 degrees, and at 100 meters 27,1 to 28„8 degrees. 



The face that the surface temperatures were lower than those found 

 at the 25-meter level appears to be the result of the efffect of the air 

 temperature on the surface level. 



There is a sharp drop in temperature at the SOO-meter 3.evel with a 

 range of 12 to 13 degrees between the tempera'oures at 100 and 200 meters, 

 that at the latter depth being ordinarily 14,2 to 16„7 degrees. The 

 temperatures at 300 meters are even lower, being from 7.-9 to 11,1 degrees. 



The temperatures of 28,1 degrees at 200 meters and 27,5 degrees at 

 300 meters off southern Woleai (Station E) are thought to be due to the 

 appearance of a localized high temperature belt in that area. 



(2) Specific Gravities 



Specific gravity was determined by titration with silver nitrate 

 using potassium chromate as the indicator. 



Just as in the case of the water temperatures, similar results were 

 obtained in all of the areas. Only the area north of Ifalik showed a low 

 specific gravity, while the figures for Woleai and Lamotrek were almost 

 identical. Except for one or two stations the vertical distribution of 

 densities showed lower specific gravities as the depth increased, a 

 phenomenon which differs remarkably from that seen at Palau (where the 



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