132 



The subsurface distribution on these two days was similar over 

 the outer shelf where again a flow to the northeast was indi- 

 cated (FigSo 66 and 67 )„ However, over the rest of the bay 

 the two patterns were different; there being an irregular 

 gradient on the 8th and a fairly smooth slope developing a 

 southerly flow on the 16th, Similar conditions occurred on 

 September 29, 1955 (Figs, 68 and 69), 



The most complex pattern of temperature distribution 

 gained from the data obtained during this survey is shown in 

 Figures 70 and 71 of the surface and subsurface topographies 

 on October 13, 1955, Even though it is conceivable and pro- 

 bable that temperature structures such as these exist, and 

 perhaps more frequently than is supposed, it is believed that 

 there were two outside contributing factors. First, the 

 traverse lines and the bathythermograph stations were closer 

 together than on any other survey. Minor variations in tem- 

 perature, which normally would have gone unrecorded, were there- 

 fore observed, particularly in the nearshore area. Secondly, 

 this cruise was a joint effort by the University of Southern 

 California and the Bureau of Sanitation, Both bathythermo- 

 graphs were carefully checked and all temperatures reduced to 

 the constant error between the surface temperature from bucket 

 samples and that from the bathythermograph. Nevertheless, there 

 is the distinct possibility that depth errors that are inherent 

 to these instruments were enough different in the two bathy- 

 thermographs to result in an unnatural depiction of the tem- 

 perature topographies. 



