TABLi':; 2.— Area enclosed bi/ border of Atlantic Current, 4:5th parallel, 49^/) meridian, 

 and rhumb line 43° N., 49° W., 42° N., 47°W., extended. Unit of area equals 10,000 

 square kilometers. 



First map 



Second map. 

 Third map... 



First map... 

 Second map. 

 Third map__. 



First map. _ 

 Second map. 

 Third map. . 



AVERAGE. 

 1937: 



First map 



Second map 



Third map 



AVERAGE. 



First map.. 

 Second map. 

 Third map. . 

 Fourth map 



First map 



Second map. 

 Fourth map- 



First map... 

 Second map. 

 Third map.. 

 Fourth map. 

 Fifth map... 



AVERAGE. 



First map... 

 Second map. 

 Third map... 



The adjusted area leaves a figure approximately representing the 

 effects of fluctuations in phenomena associated with the North Atlantic 

 eddy. Consideration has been given the fluctuations in the diff'erence in 

 sea level between Bermuda and Charleston, S. C, as determined by 

 tide gauges, with sea level adjusted to constant barometric pressure. 

 For the purposes of this discussion, it will be assumed that the differ- 

 ence in sea level, Bermuda minus Charleston, corrected for barometric 

 pressure, is a measure of the volume of flow of the Gulf Stream. Much 

 of the fluctuation in this difTerence in sea level takes place on the 

 outside of the current; that is, at the Charleston end of the section. 

 Fortunately, both tide gauge and meteorological records from Charleston 

 are available for the period covered by the oceanographic observations, 

 1934-41. However, for the Bermuda end of the section, records are not 

 complete for the period in question. Monthly normals have been 

 estimated from the mean of sea level observations made from 1833-43 

 and 1934-36 to which barometric pressure corrections based on current 

 monthly normal pressures have been made. The monthly normal 



17 



