I. INTRODUCTION 



During the winters of 1960 and 1961, U.S. Naval Oceanographic Office 

 personnel aboard USS REQUISITE (AGS-18) participated in two cruises: (1) upper 

 Persian Gulf (in general, that portion of the gulf west of 52* East longitude), 

 (2) lower Persian Gulf, the Strait of Hormuz, the Gulf of Oman, and the Arabian 

 Sea. 



Ship's tracks and station locations are shown on Figures 1, 2, and 3, and 

 oceanographic operations are summarized on Table 1 . 



II. SURVEY TECHNIQUES 



Water temperatures were measured with Nansen bottles equipped with paired 

 thermometers and with bathythermographs . 



Water samples for salinity determination were collected from the Nansen 

 bottles, sealed In rubber gasket citrate bottles, and shipped to NAVOCEANO for 

 analyses . 



Current was measured with Roberts Radio Current Meter; bottom sediment sam- 

 ples include Phleger cores, Orange Peel grabs, and dredged material . 



In the Persian Gulf and the Strait of Hormuz, and in shallow areas along the 

 coast of Pakistan and India, Nansen bottle casts used protected thermometers only. 

 At deeper Arabian Sea stations, two bottles of the first cast and as many as five 

 bottles of the second cast, had protected thermometers paired with unprotected 

 thermometers . 



Time series oceanographic station measurements were made at numerous loca- 

 tions in the Persian Gulf and the Strait of Hormuz while the ship anchored for 

 current observations . 



At 7 locations during the 1960 cruise and at 15 locations during the 1961 

 cruise, oceanographers measured currents . Usually, currents were measured at 

 4 meters (just below the ship's keel), at mid-depth, and at the bottom. During 

 the observations, the ship bow anchored, and the current measurements were made 

 directly from the ship. The meter was lowered by winch from the ship and con- 

 nected to the recorder by conductor cable . Measurement periods ranged from 30 

 seconds for a satisfactory signal to 5 or 6 minutes for erratic recordings; current 

 stations were occupied from 24 to 72 hours . Speed and direction signals were 

 recorded on a Chronograph 2-pen recorder during the first survey, and on an 

 Ester line-Angus Recorder during the 1961 cruise. 



