I70 DISCOVERY REPORTS 



four weeks to August 7 the temperature dropped to less than 15° C. It then rose again, 

 reaching 1573° C. at the surface on August 20. 



The diagram raises two points of interest, the connection with available wind records, 

 and the differing composition of the water on July 8 and August 7. On July 8 the tem- 

 perature gradient from 15-5° C. near the bottom to 17-33° C. at the surface amounted 

 to 0-38° per metre. On August 7 the water was cool throughout, the gradient from 

 14-56° C. at the bottom to 14-88° C. at the surface being about 0-005° P^"* metre. 

 From this it follows that all the water off Palominos Island on August 7 was upwelled 

 water and that it was derived from the 14-15° isothermal depth which at this time of 

 the year off Callao lay at about 80-120 m. 



5TATI0N NUMBERS_WS6G2 

 DATE— ' 



10- 



WS663 



JUNE3Q 



J_ 



WSG72 WSB84WSB65 



JULY 10 ' ' JULY 20 

 J . L 



20 



30 



40- 



50- 



BO 



Fig. 51. Diagram illustrating temperature changes off Palominos Island in the period June 26 to August 20. 



Note. The depth scale is nearly x 5 that of the sections ; the sounding in metres is given at 



the appropriate depth for each section. 



Table VII. Relation betzveen inshore surface temperature and 

 the strength and direction of wind at Palominos Island 



