The Trade Wind Zone Oceanography Pilot Study 



Part V: Townsend Cromwell Cruises 14 and 15 



March and April 1965 



By 



Robert L. Charnell, David W. K. Au 

 and Gunter R. Seckel 



ABSTRACT 



A standard grid of oceanographic stations in an area bounded by lat. 10° and 

 26° N., and long. 148° and 157° W., was occupied at monthly intervals between 

 February 1964 and June 1965. For the fifth set of two cruises, Townsend 

 Cromwell cruises 14 and 15, March and April 1965, oceanographic station data 

 are tabulated, BT data are presented in vertical sections, and the distribution 

 of surface temperature, surface salinity, and surface dynamic height relative 

 to 1,200 m. are shown in charts for each cruise. Methods and procedures as 

 well as the limitations of the data are discussed. 



INTRODUCTION 



This is the fifth of a series of reports 

 presenting physical oceanographic data of the 

 Trade Wind Zone Oceanography Pilot Study 

 conducted by the Bureau of Commercial Fish- 

 eries Biological Laboratory, Honolulu. The data 

 were obtained during a series of 16 monthly 

 cruises between February 1964 and June 1965 

 over a set station pattern in an area near the 

 Hawaiian Islands bounded approximately by lat. 

 10° and 26° N. and long. 148° and 157° W. 



The complete set of observations represents 

 a three-dimensional time-sequence distribution 

 of properties (temperature, salinity....) in the 

 trade wind zone of the central North Pacific. It 

 is a pilot study of an investigation in which 

 seasonal changes in the distribution of proper- 

 ties are to be explained in terms of 1) seasonal 

 changes in the processes of net heat and water 



Note. --Robert L. Charnell, Oceanographer , 

 presently with Hazelton Nuclear Science Corp., 

 Palo Alto, California 94303, formerly with 

 Bureau of Commercial Fisheries Biological Lab- 

 oratory, Honolulu, Hawaii; David W. K. Au, 

 Physical Science Technician and Gunter R. 

 Seckel, Oceanographer, Bureau of Conmiercial 

 Fisheries Biological Laboratory, Honolulu, 

 Hawaii 96812. 



exchange across the sea surface, and 2) the 

 effects of seasonal changes in wind stress and 

 water motion. The Trade Wind Zone Oceanog- 

 raphy Program was planned by Gunter R. Seckel 

 and is carried out under his direction by HL 

 (Bureau of Commercial Fisheries Biological 

 Laboratory, Honolulu). 



This report contains the BT (bathythermo- 

 graph) and oceanographic station data for the 

 14th and 15th cruises in the series. Figure 1 

 shows the cruise track for the two cruises and 

 gives the position of the Nansen bottle oceano- 

 graphic casts and the BT casts. 



Both cruises were made by the R/V Townsend 

 Cromwell , commanded by Captain Robert E. K. 

 D. Lee, with officers Jan Liefting and Pete 

 Andrich. The scientific parties were composed 

 of the following: 

 Townsend Cromwell , cruise 14: 

 March 8 to 28, 1965 



Bernard M. Ito - HL - Field Party Chief 



Jerome S. W. Marr - HL 



John L. Matthews - HL 



Robert M. Moncrief - HL 



James H. Uchiyama - HL 



Dayle N. Husted - Smithsonian Institution 

 Townsend Cromwell , cruise 15: 

 April 7 to 30, 1965 



