PREFACE 



The data anal/sis contained in this report was completed prior to the release 

 of the Oceanographic Atlas of the Indian Ocean (K. Wyrtki, E. B. Bennet, and 

 D. J. Rochford, published for the National Science Foundation by the Govern- 

 ment Printing Office, Washington, D.C., Nov 1971). Core flow diagrams for 

 Persian Gulf Intermediate Water, Red Sea Intermediate Water, and Antarctic 

 Intermediate Water shown in Appendix C differ in some small details from those 

 given in the above atlas. The diagrams shown in Appendix C adequately explain 

 the observed variations in sound velocity structure; therefore no attempt has been 

 made to incorporate Rochford's recently published core flow diagrams. 



The authors wish to thank J.J. Audet, Jr. of the Naval Oceanographic 

 Office for aid in retrieval of data used in this report and Dr. R. L. Fisher of 

 Scripps Institution of Oceanography for providing bathymetric charts for most of 

 the area . 



This project was funded and supported by the Long Range Acoustic Propagation 

 Project, Dr. R.D. Gaul, manager. 



Ill 



