STRINGS OF INSTRUMENT PACKAGES ARE USED TO MEASURE OCEAN CURRENTS 



SURFACE 

 MOORING 



SUBSURFACE 

 MOORING 



One method the U.S. Geological Survey has used to 

 measure ocean currents in the Gulf of the Farallones is 

 strings of instrument packages attached to mooring lines 

 anchored on the sea bottom. Surface moorings are mainly 

 used in shallower water. Photograph below shows a cur- 

 rent meter with an attached transmissometer (instrument 

 to measure water clarity) being lowered into the waters 

 of the gulf. Inset shows surface mooring (float) used for a 

 bottom-anchored string of intrument packages. 



22 Oceanography and Geology of the Gulf of the Farallones 



