The Trade Wind Zone Oceanography Pilot Study 



Part IV: Townsend Cromwell Cruises 11, 12, and 13 



December 1964 to February 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 fourth set of three cruises, Townsend 

 Cromwell cruises 11, 12, and 13, December 1964 to February 1965, oceano- 

 graphic 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 fourth 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 



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 Commercial 

 Fisheries Biological Laboratory, Honolulu, 

 Hawaii 96812. 



changes in the processes of net heat and water 

 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 

 11th, 12th, and 13th cruises in the series. 

 Figure 1 shows the cruise track for the three 

 cruises and gives the position of the Nansen 

 bottle oceanographic casts and the BT casts. 



All 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 11: 

 December 1 to 20, 1964 



Thomas S. Hida - HL - Field Party Chief 



Joseph R. Harada - HL 



Henry M. Kishinami - HL 



Jerome S. W. Marr - HL 



Howard N. Morinaga - HL 



Charles J. Rollet - HL 



Roger B. Clapp - Smithsonian Institution 



