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UNITED STATES 
DEPARTMENT OF THE INTERIOR 
FISH AND WILDLIFE SERVICE 
Bureau of Commercial Fisheries 
P. 0. Box 3830, Honolulu, Hawaii 96812 
PLAN FOR TOWNSEND CROMWELL , CRUISE 2 
I. OBJECTIVE: 
The Trade Wind Zone Investigation is an oceanographic experiment 
to verify a qualitative circulation model and to obtain those data 
which are necessary to develop a model to explain the changes in 
the distribution of properties (temperature, salinity, etc.) in 
the sea in terms of seasonal changes in processes (net heat 
exchange and water exchange across the sea surface, wind stress, 
and effects of water motion). The experiment consists of three 
phases: the design and planning phase to ensure that the data 
to be obtained are significant in terms of the problems to be 
tackled; the field phase, a four-ship, 24 months operation to 
obtain observations of the three-dimensional time-sequence dis- 
tribution of properties in the North Pacific trade wind zone; 
the analysis and evaluation phase. 
As part of the design and planning phase of the investigation a 
sequence of cruises to take place at 30-day intervals using one 
ship has been planned to test and evaluate the sampling procedures 
and processing techniques. 
Cruise 2 of the Towns end Cromwell is the second in this series of 
cruises . 
II. CRUISE PERIOD: 
March 16 to April 4, 1964. 
III. AREA OF OPERATION: 
Central North Pacific bounded by latitudes 10° N. , 27° N. and 
longitudes 148° W. , 158° W. (See attached chart for cruise track). 
IV. MISSIONS: 
A. OCEANOGRAPHIC 
1. On each of the 42 oceanographic stations temperatures and 
salinities will be obtained at the following depths: 0, 
10 (50), 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 
400, 500, 600, 800, 1000, 1200, and 1500 meters. 
