CONTENTS 



Page 



Introduction 1 



Methods 2 



Observations 2 



Instrumentation 3 



Initial processing 4 



Quality control 4 



Computational procedures 4 



1. Conversion to a standard grid 4 



2. Least squares harmonic fit 5 



3. Vertical sections of mean temperature and mean temperature change 5 



4. Tables of mean temperature 5 



Results 5 



Annual cycles 6 



Mixed layers and thermoclines 6 



Temperature inversions 6 



Structure below the permanent thermocline 7 



Coastal upwelling 8 



California subsurface countercurrent 8 



The 30-day temperature changes 9 



Acknowledgments 10 



Literature cited 10 



Appendix 1. Vertical sections of mean temperature and mean "30-day" temperature change 11 



Appendix 2. Tables of mean XBT temperature 23 



Table 



1. Number of expendable bathythermograph sections by cooperating ship and total observations 



by year on the San Francisco-Honolulu route 3 



Figures 



1. Three great circle routes between Honolulu and U.S. west coast ports on which frequent XBT 

 observations have been made by cooperating merchant ships 1 



2. The time-distance distribution of XBT observations on or near the San Francisco-Honolulu 



route from June 1966 through December 1974 2 



3. Station position chart and mean temperature cycles at selected depths for seven typical loca- 

 tions 6 



4. Monthly profiles of mean temperature for warming and cooling periods at seven typical loca- 

 tions 7 



/' 



