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I 1877 fordunstede 128."""39 Vand i 1191.7 Timer,
eller gjennemsnitlig 0."""1.08 pr. Time. 2.mra59 pr. 24 Timer.
Paa Dagtimerne falde 61 Procent, paa Nattetimerne 39
Procent. Søndenfor Polarcirkelen (60" til 66°.5 Bredde)
er i den varme Havstrøm fordunstet gjennemsnitlig 0.mm127
pr. Time, 3."""05 pr. 24 Timer. Nordenfor Polarcirkelen
(660.5 til 71°) er i samme fordunstet gjennemsnitlig 0.""" 122
pr. Time, 2."""94 pr. 24 Timer. I Polarstrømmen ved
Jan Mayen er fordunstet 0.mm037 pr. Time, 0.mm88 pr.
24 Timer.
I 1878 fordunstede 47«»26 Vand i 713.2 Timer,
eller gjennemsnitlig 0.mm067 pr. Time, l.mm60 pr. 24
Timer. Paa Dagtimerne falde 65 Procent, paa Nattetimerne
35 Procent. Søndenfor den 75de Breddegrad (70°—75»)
er i den varme Havstrøm, (inclusive Østliavet) fordunstet
0.mm090 pr. Time, 2.""" 16 pr. 24 Timer. Mellem den 75de
og 80de Breddegrad foi’dunstede i den samme Strøm (Vest
af Spidsbergen) 0.mm052 pr. Time, 1 .mm24 pr. 24 Timer. I
den varme Strøm i det hele taget fordunstede 0."""070| pr.
Time, l.ram68 pr. 24 Timer. I Polarstrømmen, Vest af
Spidsbergen, fordunstede 0.mm046 pr. Time, l.",mll pr.
24 Timer.
Man ser i disse Tal Klimatets, navnlig Temperaturens
Indflydelse paa Fordunstningen. Den følgende lille Tabel
giver en Oversigt, herover.
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.""n39 in 1191.7 hours, or, on an average, 0."""108 per
hour = 2."""59 in 24 hours. During the day-hours the
evaporation was 61 per cent, during the night-hours 39 per
cent. South of the Polar Circle (60« to 66°.5 N. lat.)
the average evaporation in the warm ocean current
was 0.mm127 per hour =z 3.mm05 in 24 hours. North of
the Polar Circle (66n.5 to 71« N. lat.), the average
evaporation in the said current was 0."""122 per hour = 2.mm94
in 24 hours. In the Polar current, off the Island of Jan
Mayen, the evaporation was 0."""037 per hour — 0."’"’88 in
24 hours.
In 1878, the quantity of water evaporated was 47.mm26
in 713.2 hours, or, on an average, 0.mm067 per hour =
1 ."""60 in 24 hours. During the day-bom’s the evaporation
was 65 per cent, during the night-liours 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.mm090 per hour zr 2."""16 in 24 hours. Between
the 75th and the 80th parallels of latitude, the evaporation
iu the same current (west of Spitzbergen) was 0.mm052
per hour = l."""24 in 24 hours. In the warm current the
average evaporation was 0.mm070 per hour = l.mm68 in
24 hours. In the Polar current, west of Spitzbergen, the
evaporation was 0.mm046 per hour r= l."""ll in 24 hours.
These figures show the effect of climate, more
particularly of temperature, on evaporation. In the following short
Table this influence is synoptically collated.
Fordunstningshøjde.
(Height of Water Evaporated)
Bredde Dag Nat pr. Døgn.
(Latitude) ( Day) (Night) (per 24 Hours)
.876. 610-66» f Varm gtrom I 56",, 44% 3.77""°
11’ 67-7? \(WarM I f’94
, ’ Polar Strøm | 61 39 |
6q~71 (P,lar Current) | J °-88
1878. 70—75 \ Varm Strom / ( \ 2.16
75-—80 j (Warm Current^) ,, \ 1.24
fi Polar Strøm \ 5 35
72 -7» . (Polar Current) | | 1,11
Fordunstningsmaaleren B. med noget forhøjet Kant
paa Fordunstningsskaalen. medfulgte den norske Korvet
„Nordstjernen", Chef Commandør H. J. Müller, 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.n""90 eller 63 Procent om Dagen (8 a.—8 ]>.) og 2."m83
The atmometer B — but with a margin somewhat more
elevated for the evaporating dish — was sent out with the
Norwegian corvette "Nordstjernen." Commodore H. J.
Müller commander, on her cruise to the West Indies in
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, —
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