179 



is typical of recently upwelled water. The other three sections show 

 characteristics similar to section C. 



In proceeding from Station ^1 to the eastward along C (see Figure 3)j 

 the heading of the GUS III was maintained without change . However, later 

 determination of position indicated a strong drift to the north as indicated 

 at Stations 51 and 52. Also, in the vicinity of Stations 56 and 57 theire 

 appeared to be a set to the west. These drifts indicated the existence of 

 an unusual current. Since salinity observations had been made to depths of 

 125 meters it was possible to compute the density distribution to these 

 depths. Further, since temperature observations reached 250 meters depth and 

 since there was a close correlation between temperature and salinity values, 

 the salinities could be inferred from the temperatures at depths between 

 125 and 250 meters and densities could be computed here. From the densities, 

 the dynamic height of the sea surface above the 25O meter reference level 

 could be determined. The topography is indicated in Figure 11. Associated 

 with this topography would be a relative geostrophic current of approximately 

 1 knot. This, then, is the current related to the distribution of mass 

 established during the hurricane passage by the wind drift current. 



Since there were some bathythermograph observations made from the 

 ALAMINOS and from the GUS III prior to the passage of HILDA, it is possible 

 to represent the local change in temperature at some six positions. The 

 superimposed temperature structures at each of these positions before and 

 after the hurricane are shown in Figure 12. The three upper positions, 

 which may be located in Figure 3, are in shallow water and the observed 

 change is what one might expect from mixing along with some cooling. 



At the three positions in deep water, all of which were along section A, 

 (indicated in the Insert on Figure 8) there are several general features. 

 In general, the depth of the mixed layer before the hurricane was less than 

 that after, and the temperature of the mixed layer was higher than it was 

 after HILDA. It should be noted that all three of these observation stations 

 were located east of the path in a region to which the warm layer of surface 

 water would have been displaced from the center of the hurricane. 



Considerable further study is needed before the data collected may be 

 fully interpreted. Present plans call for the preparation of one brief 

 article about the surface temperature change alone, another somewhat along 

 the lines of the present paper but organized for final publication, one on 

 the estimated energy redistribution (which requires considerable additional 

 research on conditions existing before the hurricane) and, finally, one on 

 the duration of the cold spot and the cyclonic circulation which was observed 

 on the GUS III cruise. 



