Launch of surface navigational mooring at the center of the Morie-1 experi- 

 ment. The surface float is instrumented with a wind recorder and radar 

 transponder to permit accurate local navigation for placement of instrument 

 packages on the ocean floor in the vicinity of the mooring. 



coast of Brazil. This deep current flows along the western edge of the 

 deep Atlantic Basin and transports cold bottom water from the 

 Antarctic into the North Atlantic Ocean. 



The movement of large masses of seawater was also the subject of 

 the NSF/IDOE Geochemical Ocean Sections Study (GEOSECS). 

 GEOSECS is studying the processes of deep mixing and circulation 

 by making detailed measurements of oceanic constituents at all 

 depths along north-south sections from the Arctic to the Antarctic. 

 These data will provide for the first time a set of physical and 

 chemical data measured on the same water samples. In addition to 

 establishing geochemical baselines, these data will provide the 

 background for quantitative studies of oceanic mixing and for 

 descriptive models of ocean circulation. The GEOSECS cruise track 

 for the Atlantic was completed in March 1973, while the Pacific track 

 will be completed in May 1974. 



Chemical oceanographers have been able to identify certain 

 features of oceanic mixing through isotope measurements. The 

 distribution of certain isotopes of hydrogen and lead and decay 

 products of uranium and plutonium have indicated large-scale 

 deepwater movements and mixing rates of surface waters with deep 

 waters. Such deep ocean currents have been predicted on theoretical 

 bases, but verification of their existence and properties has been 



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