142 



DISCOVERY REPORTS 



? EDO 



300 



400 



and reached 17-^0° C, a eradient compar- 



aiiva i.-ci^ii^,<^ i / -jy ■^.,cig a^xy. i^ ^ STATION NUMBER5-WSGI2 



ableto the rise off Caldera (Fig. 29). There miles from coast_ ' 

 was Httle further rise, the temperature 

 touching 18-04° C. in the course of work 

 on St. WS 629 at 46 miles offshore. Wind 

 blew from the east and south with force 

 4 which increased to 5 from south-south- 

 west in the open sea. During this time 

 the ship's track from Sts. WS 622 to 630 

 deviated 1 1 miles to the northward, and 

 in addition the drift had an appreciable 

 westerly component (Fig. 28). 



The return journey commenced with 

 a moderation from force 5 to 2 in the 

 southerly wind which later changed di- 

 rection to the north ; but before any change 

 in the direction of the wind was noticeable, 

 the water temperature at this distance from 

 shore had altered and the surface isotherms 

 had closed with the coast. Whereas on the 

 outward run the temperature rose sharply 

 between 10 and 21 miles offshore and from 

 31 to 46 miles had undergone no change, 

 on the return journey the temperature 

 fell from 17-9° C. and followed an even 

 curve, dropping at first slowly and then 

 rapidly until it reached 14-9" C. at 2 miles 

 from shore (Fig. 29). Thus the temperature 

 was generally warmer ; the isotherms of 17, 

 16 and 15° C. had all moved towards the 

 shore, while water of 14° C. had dis- 

 appeared. At the same time the ship was 

 carried in a north-easterly direction, as 

 may be inferred from the positions at the 

 beginning and end of St. WS 630, during 

 which the ship was drifting for 12 hours 

 (Fig. 9)- 



The question whether temperature 

 changes on this line can be correlated 

 with change of wind or with some cause 

 due to the new locality into which the 

 ship had drifted, may now be considered. 

 In the first place it is to be noted 

 that positions of isotherms had been 



WS6B WS6I5WS6I3 

 WSGB W5620 W5BI7 WS6I6 fGM 



3031-1766 1132 



SOUNDING IN METRES 5861 4864 



Fig. 22. Distribution of salinity. Section off 

 Caldera, June 4-6. 



station NUMBERS_WS6I2 

 Miles FROM COAST^ ' 50 



I 



WS6I6 W5BI5WS6I3 

 WS6I3W5620V*6I7|WS6I6 W56I4| 



200 



400 



3031- 1766 1132 



SOUNDING IN METRE5_5e6l 4664 



Fig. 23. Distribution of temperature (° C). Section 



off Caldera, June 4-6. 

 The position of this section is shown in Figs. 3 and 5. 



