50' 



N45' 



o 



COBB 

 SEAMOUNT 



BUOY SITE 



SEATTLE 



47°05' 



N47°00'- 



130° 



125° 



12:°W 



FIGURE 24.— Site of the Pacific Oceanographic 

 Laboratories Near-Surface Circulation Studies. 



128°30' 



128°20' 



128°10' 



128°00'W 



FIGURE 25.— Location of the STD casts. Casts 1001 

 to 1019 were measured between August 3 and 6, 

 1971, the others on September 5 and 6, 1971. 



Honolulu and San 

 Hawaiian Enterprise. Voyage 32W 



33 

 34 

 35W 

 President Cleveland, Voyage 190 

 SS Californian. Voyage 207 



Honolulu and 

 Michigan. Voyage 12 

 President Cleveland, Voyage 190 

 Nevada Standard, Voyage 554 



Francisco 



November 8-11, 1971. 



November 23-27, 1971. 



December 4-10, 1971. 



December 24-28, 1971. 



November H-15, 1971. 



October 20-24. 1971. 

 Japan 



October 1-8, 1971. 



October 2-10, 1971. 



November 21-26, 1971, 



Near-Surface Circulation Studies 



The NOAA Pacific Oceanography Laboratory (POL), Seattle, 

 Wash., obtained data on the structure of the oceanic surface boun- 

 dary layer (near-surface circulation studies) at about 47.2°N., 

 1 27.7 "W., (fig. 24) in August and September 1971. POL studied 

 the response of the thermocline region to the strong intertial cur- 

 rents generated in the mixed layer by the action of a local wind. 



A Richardson buoy was moored in the Cascadia Basin of the 

 northea.st Pacific using the mooring method and hardware tested by 

 the Woods Hole Oceanographic Institution. Recorded were: (1) 

 Wind speed and direction; (2) water speed and direction in the 

 mixed layer, in the thermocline region, and beneath the thermo- 

 cline; (3) air temperature; (4) water temperature in the mixed 

 layer, in the thermocline region, and beneath the thermocline; 

 (5) water pres-sure; and (6) dynamic topography of the surround- 

 ing area and vertical distribution of Brunt-Vaisala frequency near 

 the moored buoy. 



A salinity-temperature-depth survey of the area surrounding the 

 buoy was completed after its mooring (fig. 25) and repeated before 

 its recovery, to provide a record of horizontal distribution of den- 



sity (dynamic topography) and vertical distribution of density 

 ( Brunt-VaivSala frequency) at the site. 



Air-Sea Interaction and Mixed Layer Project 



The Mixed Layer Project is one of two IDOE projects conducted 

 by NOAA's Atlantic Oceanographic and Meteorological Labora- 

 tories. The objectives of this project are to study: (1 ) The total heat 

 exchange across the air-sea interface on a diurnal or smaller time 

 scale as inferred from the total heat budget of the oceanic mixed 

 layer; and (2) the vertical structure of the temperature, salinity, 

 and current fields in the mixed layer of the ocean in relation to 

 vertical heat transfer processes and mixing. 



To achieve these objectives, a number of instrumentation systems 

 were used. Two MAMOS-type buoys were deployed; 28-foot para- 

 chutes at a depth of 30 m. were used. One buoy was instrumented 

 with a quartz-thermometer system that recorded temperatures at 

 l-min. intervals for depths of 10, 20, 30, 40, and 50 m. on a digital 

 magnetic tape recorder. The other buoy recorded air temperature, 

 humidity, sea-surface temperature, and wind speed on digital mag- 

 netic tape. 



The buoys were deployed by the OSS Discoverer at about 21 °N., 

 64°W., on September 28, 1971. The experiment ended October 31, 

 1971. 



Circulation Studies — CICAR 



NOAA's Atlantic Oceanographic and Meteorological Labora- 

 tories (AOML) conducted another field project under IDOE with 

 emphasis on studies to be done under the auspices of the interna- 

 tional Cooperative Investigation of the Caribbean and Adjacent 

 Regions (CICAR) Program. These studies concentrated on tidal 

 phenomena and the development and application of Lagrangian 

 methods of current measurement in the CICAR region. 



12 



