N-POS SUMMER 



EAST OF SINGAPORE 



1545 

 SOUND SPEED, m/s 



Figure 3.6. Characteristic winter and summer sound 

 speed profiles for East of Singapore site. 



3.4 Lands End 



The Lands End site is located on the continental shelf, southwest of England. The 

 local area, 49°-51°N, 8°-10°W, is shown in Figure 3.7. This site represents a high latitude 

 location exposed to the influence of the open ocean circulation in contrast to the relatively 

 more isolated North Sea site. Water depths of the sound speed profile data sample varied 

 from 80 to 151 m. Representative winter and summer sound speed profiles are shown in 

 Figure 3.8 to the average depth of 125 m. A summary of the sound speed data set is given 

 in Table 3.7. Ninety-eight percent of the fall and winter profiles and 23 percent of the 

 spring and summer profiles were classified as positive gradient profiles. 



Properties of the sediments at this site are given in Table 3.8. The sediment is sand 

 with undulations up to 25 m high. An intermediate layer of mudstone overlies the acoustic 

 basement of sedimentary rock at about 320 m deep. 



26 



