rindelse er det iskoldt Vand, og det vedligeholder denne 
Character helt til henimod Norges Banker. Det opvarmes 
noget paa Vejen, fra oven og fra begge Sider, af det varme 
Vand, der strømmer over Island-Færø-Ryggen, og af det 
varmere Vand mellem Jan Mayen og Norge. 
Udenfor Lofoten og Vesteraalen gjør den nedstigende 
Bevægelse i de dybere Lag sig gjældende ogsaa i 300. Favnes 
Dyb. Det nordover strømmende varme Vand drages vest- 
over og nedover henimod Jan Mayen, som Temperaturkartet 
Pl. XIX viser. Det setter altsaa tvers over det bariske 
Minimum i denne Dybde. 
Kommen vestenfor Greenwich Meridian bøjer Isoba- 
rernes Retning Bevægelsen mod Syd. Dette er udtrykt 
ved den varme Tunge paa over 2° i Sydost for Jan Mayen. 
Vestenfor denne slutter Bevægelsen af det ombøjede varme 
Vand sig til det kolde Vand fra Jan Mayen Renden, som 
det ledsager, med indbyrdes Opvarmning og Afkjoling, 1 
dets cycloniske Bevægelse sondenom det bariske Minimum 
og videre østover og nordover. 
Østenfor Tungen for 2° ligger et thermisk Minimum 
paa 19.1. Det er Virkningen af den opstigende kolde Strøm, 
der existerer i Dybet paa dette Strøg. 
I Polarstrømmen spore vi den afkjølende Virkning 
fra neden af Trykminimet paa 73° til 74° Br. mellem 0° 
og 5° E. Led. i den lave Temperatur paa under —1°, som 
den sydsydvestgaaende Strøm her paa dette Strøg faar. 
Paa Østsiden af Jan Mayens Banke løber Polarstrøm- 
men med en betydelig Fart, og bringer Kuldegraderne 1 en 
fra Dybet. Paa 
sig, suget rundt 
Tunge sydover, vistnok tildels ved Sugning 
Vestsiden af Banken maa Vandet bevæge 
lobende Strom, 
imod Nordvest, imod Trykket, for senere at boje om i 
Følge med Strømmen 1 Jan Mayens Rendens Hoveddel. 
Denne Ombojning af Strømmen i Le af en Kyst eller 
Banke er analog med Vindens Virkning paa Vandet ved 
Spidsbergens Vestkyst. Virkningen beror naturligvis paa 
Bankens Form og Stillmg mod den. herskende Strøm. 
Bankens Form er i det foreliggende Tilfælde for en Del hypo- 
thetisk (Side 4), men Reactionens Virkning se vi 1 den for- 
dens Sydpynt af den paa Nordvestsiden 
holdsvis varme Tunge, der skyder op paa Bankens Vest- 
side. Wi gjenfinde denne Tunge i de større Dyb og se 
den 1 1000 Favnes Dyb ogsaa motiveret ved det herværende 
Trykmaximum. 
Paa Karterne har jeg søgt at antyde Bevægelsens 
Retning ved Pile. Hvor Bevægelsen har en opstigende 
Component, har Pilen et Punkt i Enden; hvor den har en 
nedstigende Component, har Pilen en Ring i Enden. 
Bevægelsens Hastighed i 800 Favnes Dyb kan vistnok 
for en stor Del af Havet beregnes efter Formelen Side 176, 
naar man sætter Afbojningsvinkelen a@ = 90°, nemlig paa 
de Steder, hvor Bevægelsen foregaar parallel med Isoba- 
rerne. Hvor Bevægelsen gaar i en Retning, der danner 
182 
Originally ice-cold water, it retains this character to well- 
nigh the Norwegian banks. It gets slightly warmed 
on its course, from above and from both sides, by the 
warm water flowing over the Iceland-Færoe Ridge, and by 
the warm water that passes between Jan Mayen and 
Norway. , 
Off Lofoten and Vesteraalen, the downward motion 
in the deeper strata makes its influence felt also at a 
depth of 300 fathoms. The warm water flowing north is 
drawn westward and downward, in the direction of Jan 
Mayen, as appears from the Map of Temperature, Pl. XTX. 
Hence, it crosses the baric minimum at that depth. 
West of the meridian of Greenwich, the direction of 
the isobars turns the motion towards the south. This has its 
thermic expression in the warm tongue of water, of a tem- 
perature exceeding 2°, south-east of Jan Mayen. West 
of this tongue, the motion of the warm water, turned aside 
as stated above, joins the cold water from the Jan-Mayen 
Channel, which it accompanies, with reciprocal cooling and 
warming, in its cyclonic motion south of the barie minimum, 
and farther on towards the east and north. 
To the east of the tongue for 2°, we observe a thermic 
minimum of 191. It results from the ascending cold 
current, present in the deep throughout this tract. 
In the Polar current, we trace the cooling effect from 
below of the pressure-minimum, lat. 73° to lat. 74° N, be- 
tween long. 0° and 5° E, in the low temperature, less than 
—1°, which the current setting south-south-west exhibits here. 
On the east side of the Jan-Mayen Bank, the Polar 
current runs with considerable velocity, and carries the 
temperatures below zero as a tongue southward, aided 
no doubt by suction from the deep. On the west side of 
the bank, the water must move, drawn round its southern 
extremity by the current flowing on the north-west side, 
towards the north-west. against the pressure, to bend round 
subsequently, along with the current in the main part of 
the Jan-Mayen Channel. This bending-round of the current 
under the lee of a coast or a bank is analogous to the 
of the wind on the water off the west coast 
of Spitzbergen. The effect depends of course on the form 
and position of the bank relative to the prevailing current. 
The form of the bank in the present case is partly hypothetical 
(p. 4); but the effect of the reaction may be seen in the com- 
paratively warm tongue that shoots up on the west side 
of the bank. We again meet with this tongue in the 
greater depths, and observe it at a depth of 1000 fathoms, 
also as the result of the pressure-maximum occuring there. 
On the maps I have sought to indicate the direction 
of the motion by means of arrows. Where the motion has 
an ascending component, the arrow exhibits a dot at the 
end; where it has a descending component, the arrow ex- 
action 
hibits a ring at the end. 
The velocity of the motion at a depth of 300 fathoms 
may, it is true, for a great part of the sea, be computed 
according to the formula p. 176, putting the angle of detlec- 
tion @ = 90°, viz., at places where the motion proceeds 
parallel with the isobars. Where the motion proceeds in 
