1156 
3.26 Bravurort-units; the average annual strength is N 70° EK. 2.85. 
These values agree with the above-mentioned figures of loss and 
gain of heat. 
A second series of data to justify our theory we find in HerLLAND- 
HANsEN’s and Nansen’s wellknown work’), where the following 
figures for the open water in the Barents-Sea for May are given in 
thousands of square kilometers. 
TABLE Vir 
BEES | Sone meat 
May 1900 | 1901 | 1902 1903 1904 | 1905 | 1906 | 1907 ‚ 1908 | 
645 
THoneands a | tE | | | 
| albers 440 | 398 | 249 | 469 | 696 | 639 | 576 
568 | 
In Nansen’s opinion, the surface of open water depends in a great 
measure upon the watertemperature of the preceding winter. According 
to this we have only to compare the strength of the trade with 
these figures, keeping in mind that departures from the mean surface 
of open water in May 1900 should be in accordance with departures 
from the mean strength of the trade-wind for the period Sept. or 
Oct. 1898—Sept. or Oct. 1899. 
In table IX we give the corresponding departures, the correlation 
is 0.55. 
TABEL IX, 
| 1900 | 1901 | 1902 | 1903 | 1904 | 1905 | 1906 1907 | 1908 
= 
ae = nn : ste NEK = 
_9.28 | - 0.43 | —0.12 | —0.13 | —0.10 | 40.53 | +0.22 | +-0.03 | +-0.28 
| | | 
| —80 | —122 | -271 | —S1 | +176 | +119 | +56 | +125 | +48 
Lastly we will consider the relation between the departures from 
the mean value of the annual North-sea level on the Dutch coast ®) 
and those in the mean average strength of the trade, in such a way 
that the windyear ends consecutively 31% August, 30% September 
ete.; the wateryear always on 31st December. In table X it is 
evident that « difference in time of two months gives the best 
1) The Norwegian Sea. Its physical oceanography based upon the Norwegian 
researches 1900—1904 by Björ: HELLAND HANSEN and Fripryor NANSEN. Report 
on Norwegian Fishery and Marine Investigations. Vol. Il 1909. NO, 2. 
2) The data required for this purpose we owe to the service of the “Rijks- 
Waterstaat”. 
