ILLUSTRATIONS 



FIGURE Page 



Frontispiece: Chart of the vessel tracks for Charles H. Gilbert cruise 17 (solid line) 

 and Hugh M. Smith cruises 27 (broken line) and 30 (dotted line). 



Charles H. Gilbert cruise 17 



1. Stations and BT positions 7 



2-4. Smoothed geopotential anomaly of the isobaric surfaces relative to the 1, 000- 



decibar surface 8 



5-7. Zonal components of the geostrophic currents 11 



8 - 1Z. Anomaly of the geopotential topography relative to the 1, 000-decibar surface of 



the 0-, 100-, Z00-, 400-, and 600-decibar surfaces 14 



13 - 19. Temperature profiles. 19 



Z0. Surface temperatures. Z3 



Zl - Z3. Vertical sections of sigma-t Z4 



Z4. Surface sigma-t 27 



Z5 - Z7. Depth of the Z5. Z, Z6. 0, and Z6. 8 sigma-t surfaces 28 



28 - 30. Vertical sections of salinity 31 



31. Surface salinity. 34 



32 - 34. Salinity on surfaces of constant sigma-t 35 



35 - 37. Vertical sections of dissolved oxygen 38 



38 - 40. Dissolved oxygen on surfaces of constant sigma-t 41 



41 - 43. Vertical sections of inorganic phosphate 44 



44 - 46. Normal and 1954 mean monthly positions of the Aleutian Low and Eastern North 



Pacific High and of the northeast trades and westerlies and tracks of the centers 



of the low pressure areas for September, October, and November, 1954. . . 47 



Hugh M. Smith cruise 27 



47. Stations and BT positions 50 



48 - 52. Smoothed geopotential anomaly of the isobaric surfaces relative to the 1, 000- 

 decibar surface 51 



53 - 57. Zonal components of the geostrophic currents 54 



58 - 62. Anomaly of the geopotential topography relative to the 1, 000-decibar surface of the 



0-, 100-, 200-, and 600-decibar surfaces 57 



63 - 67. Temperature profiles. 62 



68. Surface temperatures. 64 



