Date 1967 Event 



12 July Arrived at first oceanographic station in 



position 65°01'N, 171°34'W. 



17 July Completed station 42 and first occupation 



of sections E-E', D-D', C-C and B-B'. 

 Enroute section E-E' for re-occupation. 



19 July Completed re-occupation of section E-E'. 



23 July Completed re-occupation of section B-B' 



with the exception of one station; ship at 

 position 67°15'N, 170°48'W. Enroute Point 

 Barrow to assist CSS RICHARDSON, 

 trapped in 10/10 concentration of thick 

 winter ice. 



26 July Completed RICHARDSON SAR case. En- 



route southern Chukchi Sea to recover 

 tidal gauge. 



28 July Retrieved tidal gauge and two anchored 



current meter arrays with little difficulty. 

 Enroute Port Clarence, Alaska. 



29 July Arrived Port Clarence and disembarked 



scientific party. 



Cruise Narrative 



The oceanographic phase of the USCGC 

 NORTHWIND 1967 Arctic West Patrol began 

 with the embarkation of seven scientific per- 

 sonnel at the U.S. Coast Guard LORAN Sta- 

 tion, Port Clarence, Alaska on 8 July 1967. 

 The ship then steamed north to the position 

 67°04'N, 171°12'W off the northern Siberian 

 coast to install a recording water level gauge 

 on the sea bottom. This gauge was one of six 

 such instruments anchored by the University 

 of Washington during the survey period at 

 various locations in the Chukchi Sea-Bering 

 Sea area to monitor the tidal oscillations. On 

 11 and 12 July two buoys with current meter 

 arrays attached were anchored in the positions 

 66°36'N, 168°15'W and 64°55'N, 168°39'W. 

 Each buoy marked the location of two Braincon 

 Type 316 Histogram Current Meters at depths 

 of about 13 and 25 meters. These meters utilize 

 a Savonious Rotor as a current speed sensor 

 and current direction is sensed by complete 

 instrument pressure case orientation to flow. 

 Three of the four meters recorded continuously 

 over the entire observational period from 12 

 July to 29 July. 



Between 12 July and 23 July the USCGC 

 NORTHWIND occupied 83 oceanographic sta- 

 tions comprising two occupations of the four 

 sections shown in figure 1. The ship anchored 

 at each of these stations and the water prop- 

 erties of temperature, salinity, and dissolved 



oxygen were measured as well as making di- 

 rect current measurements. The oxygen data 

 are incomplete for section D-D' due to a short- 

 age of sample bottles and the close station 

 spacing. 



On 23 July the USCGC NORTHWIND was 

 diverted from the sui-vey to assist in the rescue 

 of the CSS RICHARDSON trapped in thick 

 winter ice five miles northwest of Point Bar- 

 row. After the rescue mission the USCGC 

 NORTHWIND returned to the survey area on 

 28 July and recovered the water level gauges 

 and the two current meter arrays. The oceano- 

 graphic field party was disembarked at Port 

 Clarence on 29 July completing one of the 

 most successful surveys of the Bering Strait 

 current regime to date. 



Data CoUection 



Personnel from the U.S. Coast Guard Ocean- 

 ographic Unit (CG Oceanographic Unit) con- 

 ducted Nansen bottle casts at each station, 

 taking observations from the surface to near 

 the bottom at 5-meter intervals. A total of 83 

 oceanographic stations were occupied. The 

 Nansen bottles were equipped with two pro- 

 tected reversing thermometers, mainly of 

 Yoshino Keike manufacture. Shoal water in 

 the Bering Sea area precluded the use of un- 

 protected thermometers. Water depth rarely 

 exceeded 50 meters. The Nansen bottles were 

 allowed to sit at the desired depths for a mini- 

 mum of six minutes before being reversed. 



Upon retrieval of the cast, water samples 

 were drawn immediately for the dissolved oxy- 

 gen analyses. The method used was a modified 

 Winkler determination involving the titration 

 of an aliquot portion of the treated sample 

 with sodium thiosulfate using starch as an 

 endpoint indicator. 



Salinity samples were drawn from each 

 Nansen bottle and determinations run at least 

 every fourth station. Salinities were determined 

 using the Model 6220 inductive salinometer 

 manufactured by the Bissett-Berman Corpora- 

 tion. This instrument has an accuracy stated 

 by the manufacturer of ±.003%o. At least two 

 determinations were made on each sample. 



Temperature, salinity and oxygen data were 

 processed by personnel at CG Oceanographic 

 Unit, Washington, D.C. Corrected data were 

 recorded on form NHO/NODC-3167/l(l-61), 



