352 



The Representation of Oceanic Movements and Kinematics 



Fig. 145. Anchor station of the "Ahair": path of a water particle from 19 June 1938 00.00 

 to 20 June 1938 14.14 MGZ. (Represented by a successive plotting of the observed current 

 valuesf as a mean between the depth 5 and 15 m). Mean basic current from 19.00 to 20.00 

 MGZ: north component: —4-5; east component: —161 = W. 15° S., 16-7 cm/sec. 



t In order to simplify the numbers indicated at each individual point are values rounded 

 off to total hours. Therefore « h is always (« — l)h 48 m, for example, 3 h = 2 h 48 m. 



by an example. The method given below is mostly used but each case requires indi- 

 vidual treatment. At the "Meteor" anchor station, 16-20 June 1938 (44° 33' N., 

 35° 58' W., mean depth about 1400 m) the current values were measured for a single 

 interval of 10 min in each hour at eight depths (Defant, 1940Z)). Figure 146 contains 

 unsmoothed values for the N- and jp-components at 5 and 15 m depth for the period 

 from 17 June, 04.00 h to 19 June, 18.00 h (MGZ). 



This gave a rather irregular, jagged curve, partly because of chance disturbances 

 and partly because of errors in the measurement. Since the tidal currents were ex- 

 pected to be rather strong these were then eliminated by taking continuous means 

 over 24 lunar hours (from one moon culmination to the next). The smoothing showed 



Tim*- 



I7 3ZI 



4 6 8 10 



Fig. 146. Current components at the anchor station of the "Altair" June 1938 (,4> = 44° 

 33' N., A = 33° 58' W.). — i — i — i — i — , N. and E. components according to the observation; 

 --0 — o--, basic current after elimination of the periodic parts (tidal current and inertia 



current); 1 1 , basic current + tidal current of the diurnal and semi-diurnal wave 



+ current of the inertia wave (according to the values of the harmonic analysis). 



