1150 
yearly mean values for the region 15°—25° N. and 25°—40° W., 
as given in the preceding table *). 
For the South-Atlantie monthly data are not at our disposition, 
below we give the three-monthly mean values and departures from 
the normal for the region 5°—10° S. and 15°—35° W.?). 
TABLE 11. 
Direction «_m. p. sec. | Departure 
Dec.—Febr. N123° E, 4.58 — 0.56 
March—May iB Wy 4.29 — 0.85 
June—Aug. 132 6-12 ‚ + 0.98 
| + 0.44 
Sept.—Nov. | 137 5.58 
Maxima and minima of the North-East and South-East trades 
appear to coincide fairly well, table [ shows a real correspondency 
between the North-East trade and the North-Equatorial current ; the 
positive and negative departures in the strength of the trade wind 
correspond with one exception with those in the velocity of the 
Equatorial current and show a difference in phase of one month. 
We should keep in mind, that winds with great stability as the 
trades and monsoons are generally considered to be the prime cur- 
rent-generators : furtheron in this study we will try to explain depart- 
ures from normal-level in the North-Sea or from the normal-surface 
of open water in the Barents-Sea, with the aid of fluctuations in 
the strength of the North-East trade. 
It would be better for this purpose to make use of fluctuations 
in the North-Equatorial current, but as a matter of fact current- 
observations are always less in number than windobservations and 
therefore we have to rely on the wind. 
In the following table we give the monthly departures from the 
yearly mean level, as they have been calculated from long tide-gauge- 
observations at 7 Baltic and 3 North-Sea stations; Fig. 1 shows the 
departures in velocity of the stream and in the waterlevel. 
1) Kon. Ned. Met. Instituut. 
N°, 95. Observations océanographiques et météorologiques dans la region du 
courant de Guinée 1855—19G0. Utrecht 1904. 
N°. 107. Monthly Meteorological Data for ten-degree squares in the Atlantic and 
Indian Oceans 1900—1914. 
*) Pilot Chart of the South Atlantic Ocean. Dec.—Jan.—Febr. etc. Hydrographic 
Office and Weather Bureau Washington D. C. 
