I 1877 fordunstede 128.””39 Vand 1 1191.7 Timer, 
eller gjennemsnitlig 0.””108 pr. Time, 2.7759 pr. 24 Timer. 
Paa Dagtimerne falde 61 Procent, paa Nattetimerne 39 
Procent. —Søndenfor Polarcirkelen (60" til 660.5 Bredde) 
er i den varme Havstrøm fordunstet gjennemsnitlig 0.7127 
pr. Time, 3.””05 pr. 24 Timer. Nordenfor Polarcirkelen 
(660.5 til 71°) er i samme fordunstet gjennemsnitlig 0.7” 122 
pr. Time, 2.””94 pr. 24 Timer. I Polarstrømmen ved 
Jan Mayen er fordunstet 0.””087 pr. Time, 0.””88 pr. 
24 Timer. 
d.2 
I 1878 fordunstede 47.””26 Vand 1 71 Timer, 
eller gjennemsnitlig 0.””067 pr. Time, 1.7760 pr. 24 Ti- 
mer. Paa Dagtimerne falde 65 Procent, paa Nattetimerne 
35 Procent. Søndenfor den 75de Breddegrad (70:—750) 
er i den: varme Havstrøm, (inclusive Østhavet) fordunstet 
0.7090) pr. Time, 2.7716 pr. 24 Timer. Mellem den 75de 
og 80de Breddegrad fordunstede i den samme Strom (Vest 
af Spidsbergen) 0.7052 pr. Time, 1.”"24 pr. 24 Timer. I 
den varme Strøm i det hele faget fordunstede 0.””070 pr. 
Time, 1.””68 pr. 24 Timer. I Polarstrømmen, Vest af 
Spidsbergen, fordunstede 0.””046 pr. Time, 1.””11 pr. 
24 Timer. 
Man ser i disse Tal Klimatets, navnlig Temperaturens 
Indflydelse paa Fordunstningen. Den følgende lille Tabel 
giver en Oversigt herover. 
148 
hours. In 1876, the observations refer to the tract of 
ocean between Norway and Iceland, ranging from the 61st 
to the 66th parallel of latitude. 
In 1877, the quantity of water evaporated was 
128.”m39 in 1191.7 hours, or, on an average, 0.”"108 per 
hour = 2.”"59 in 24 hours. During the day-hours the evap- 
oration was 61 per cent, during the night-hours 39 per 
cent. South of the Polar Circle (600 to 660.5 N. lat.) 
the average evaporation in the warm ocean current 
was 0.”"127 per hour = 3.705 in 24 hours. North of 
the Polar Circle (66°.5 to 710 N. lat.), the average evap- 
oration in the said current was 0.””122 per hour = 2.94 
in 24 hours. In the Polar current. off the Island of Jan 
Mayen, the evaporation was 0.””037 per hour = 0.”"88 m 
24 hours. 
In 1878, the quantity of water evaporated was 47.””26 
in 713.2 hours, or, on an average, 0.”"067 per hour = 
1.””60 in 24 hours. During the day-hours the evaporation 
was 65 per cent, during the night-hours 35 per cent. South 
of the 75th parallel of latitude (70°—75°), the evaporation 
in the warm ocean current (inclusive of the Barents’ Sea) 
was 0.”"090 per hour = 2.""16 im 24 hours. Between 
the 75th and the 80th parallels of latitude, the evaporation 
iu the same current (west of Spitzbergen) was 0.”"052 
per hour = 1.24 in 24 hours. In the warm current the 
average evaporation DANN per Inoue == iets) im 
24 hours. In the Polar current, west of Spitzbergen, the 
evaporation was 0.””046 per hour = 1.”"11 in 24 hours. 
Was 
These figures show the effect of climate, more particu- 
larly of temperature, on evaporation. In the following short 
Table this influence is synoptically collated. 
Fordunstningshojde. 
(Height of Water Evaporated) 
| 
| 
Bredde 
(Latitude) 
ele : he Varm Strøm 
Od Ege | (Warm Current) 
== 67 7 | 
6 Polar Strøm 
GN 9T7E (Pilar Current) 
1078 7JO=75 | Varm Strøm | 
— 75--80 }( Warm Current) 
We aes Polar Strom 
i Jo J 
(Polar Cur 
Fordunstningsmaaleren B, med noget forhøjet Kant 
paa Fordunstningsskaalen, medfulgte den norske Korvet 
» Nordstjernen*, Chef Commander H. J. Miiller, paa dens 
Togt til Vestindien Vinteren 1878. Beregningen af de i 
Januar 1879 daglig anstillede Fordunstningsmaalinger, i 
Vestindien, dels ved St. Thomas, dels ved Martinique giver 
en Fordunstningshøjde af 7””73 pr. 24 Timer, og deraf 
4,”m90 eller 68 Procent om Dagen (8 a.—8 p.) og 2.”83 
ent) 
Dag Nat pr. Dogn. 
(Day) (Night) (per 24 Hours) 
BOTln Ban Ser 
l | 3-05 
61 BO) 2 
| 0.88 
| | 2.16 
65 35 VE 
| of 
The atmometer B — but witha margin somewhat more 
elevated for the evaporating dish — was sent out with the 
Norwegian corvette *Nordstjernen.” Commodore H. J. 
Miller commander, on her eruise to the West Indies m 
the winter of 1878—1879. The computation of the daily 
measurements of evaporation made in January 1879 in the 
West Indies, partly at St. Thomas, partly at Martinique, 
give for the water evaporated a depth of 7.”"73 in 24 hours, — 
