CONTENTS 



Introduction 1 



Methods 2 



Results and discussion 3 



Comparison of ballasted and unballasted drift bottles 3 



Surface circulation 3 



January-February 3 



March-May 4 



June-July 8 



August 10 



September-December 10 



Literature cited 13 



Figures 



1. The drift bottle study area in the northwestern Gulf of Mexico with the location of stations occupied 



in 1962 and 1963 2 



2. Surface circulation deduced from recoveries of drift bottles released in January 1963 and February 



1962 and 1963 in the northwestern Gulf of Mexico 6 



3. Surface circulation deduced from recoveries of drift bottles released in March and April 1962 and 



1963 in the northwestern Gulf of Mexico 7 



4. Surface circulation deduced from recoveries of drift bottles released in May 1962 and 1963 in the 



northwestern Gulf of Mexico 8 



5. Surface circulation deduced from recoveries of drift bottles released in June and July 1962 and 1963 



in the northwestern Gulf of Mexico 9 



6. Surface circulation deduced from recoveries of drift bottles released in August 1963 in the northwest- 



ern Gulf of Mexico 10 



7. Surface circulation deduced from recoveries of drift bottles released in September and October 1962 



and 1963 in the northwestern Gulf of Mexico 11 



8. Surface circulation deduced from recoveries of drift bottles released in November 1962 and 1963 and 



December 1962 in the northwestern Gulf of Mexico 12 



Tables 



1. Numbers of drift bottles released and recovered in the Gulf of Mexico within 0-15 and 16-30 days, by 



cruises, 1962 and 1963 3 



2. Comparison by cruise of recovery of ballasted and unballasted drift bottles within 30 days after 



release in the Gulf of Mexico 4 



3. Comparison of the direction and speed of ballasted (B) and unballasted (U) bottles recovered within 



15 days after release in the Gulf of Mexico 5 



4. Estimated range and average current velocity for September-December, 1962-63, in the northwestern 



Gulf of Mexico 13 



in 



