Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
184
der sig store „Bleker" og Opkommer af Vand til risse
Tider, naar den store Flodbølge passerer gjennem denne
Hende mod Nordost. Bergarter fra Hyggen ere. i
Smaastykker. meget talrigere og større i det iskolde end i det
varme Strøg, og de pege saaledes paa den Retning, i
hvilken Strømningerne feje Bunden. De større Stene ligne
Bergarterne fra Orkenøerne".
Langs Norges Kystbankcr tor Hastigheden af
Strømmen i 800 Favnes Dyb gaa op til 0.12 ni. p. S. (5 a 6
Kvm. i 24"), i Polarstrømmen ved Jan Mayen til 0.16 ro.
p. S. (i i 8 Kvm.), under Grønlaud til 0.08 m. p. S. (4 a
5 Kvm.). I den centrale Del ere Hastighederne meget
ringe.
Efter at have studeret Bevægelserne i 300 Favnes Dyb
kunne vi nu med fuldere Forstaaelse gaa over til at betragte
Bevægelserne i de Dybder, der ligge mellem denne
Niveau-Hade og Overfladen.
1 de øverste Vandlag fylder Strømmen fra
Atlanterhavet nordenom Skotland Nordsøen. Dell bringer det salte
Vand fra Oceanet ind over Nordsøens Flak (l’). XXXV)
og fylder dell norske Rendes Dyb’ med ægte salt
Atlanterhavsvand. 1 den sydlige Del af Nordsøen er Vandet mere
opspædet at Elvene, navnlig i de ovre Lag.
I lllll Favnes Dyb i PI. XVII) se vi Virkningen af
den nordgaacnde varme Strøm laugs Nordsøbanken og
Norges Kystbanker. I l-’ærø-Shetland Renden suges
aabenbart Vand langs den nordre Bred sydover fra ilet norske
Hav. Langs Nøl-ges Banker gjør endnu Laudkulden sig
gjældende. Variuetllllgerne ligge løsrevne fra Banken med
koldere Vand imellem begge.
I Osthavet driver Stronuncn varmt Vand ind til
omtrent Midten af Havet i 100 Favnes Dyb. I dets østlige
og nordlige Del formaa Vindene og Ta-thederne ikke at.
fore Vandmassen i dens hele Mægtighed med. Bunden er
dækket af iskoldt Vand fra Havets nordlige Del. Dette
Vands øvre Lag rives med af OverHailestrønnnen. og maa
erstattes af Vand, der langs Bunden tinder sin Vej
nordenfra. fra Egne. llvor Havets Vand altid har en lav
Temperatur gjennem hele sin Dybde.
Den kolde Storfjord paa Spidsbergen sender koldt
Vand ned i den Indliugtning. som Banken har østenfor
Sydkap. Paa Vest-Spidsbergens Banker se vi i Ion
Favnes Dyb Landkuldens Virkning.
I den grønlandske Polarstrøm gjenfinde vi den
afkjo-lende Virkning af Dybets Tr.vkmiiiiiuuni under 73»—74»
Bredde og Striuiiniiigeriie omkring Jan Mayens Banke.
to the north-east. Over the ridge large smooths and welling»
up of water take place at certain times as the great tidal wave
jiasses through this channel into the North Sea. Mineral
partieles from the ridge are much more numerous mul larger
in the cold than in the warm area, thus indicating the
direction in which the currents sweep. The stones resent Mo
those of the Orkneys."
Along the coast banks of Norway, the velocity of the
current at a depth of 300 fathoms may reach 0.12 in. per
see. (5 or 6 naut. miles in 24 hours!; tin- velocity of tin- Polar
current off Jan Maven, 0.16 m. per see. (7 01-8 naut. miles),
off tile coast, of Greenland 0.08 in. per see. 14 or 5 naut.
miles). In the central part the velocities are very trifling.
Heaving investigated the motion at a depth øf 300
fathoms, we cail now with fuller comprehension puss on
to consider those in the depths between that level and
the surface.
In the upper strata, the current from the Atlantic
north of Scntlandtfills the North Sea. It brings witli it
the salt water from that ocean over the flat ol’ the North
Sea (Pl. XXXV), and fills the deep of the Norwegian
Channel1 with genuine salt Atlantic water. In the south part
of the North Sea, the water is more diluted with
tin-outflow of the rivers, more especially throughout the upper
strata.
At a depth of 100 fathoms (Pl. XVII). we see the
(-fleet of the warm current setting north along the
North-Sea bank and the Coast Banks of Norway. In the
Færoe-Shetland Channel, water is manifestly drawn smith by
sue-tion along the northern margin from the Norwegian Sea.
Along the Norwegian banks, the land-cold still asserts its
influence: the tongues of beat lie ipiite isolated from the
bank, with colder water intervening.
In the Barents Sea the current forces in the warm
water to well-nigh the middle of that tract of ocean, at
the depth of 100 fathoms. In its eastern and northern
parts, the winds and the densities combined are unable to
carry along the water in its entire depth. The bottom is
covered with ice-cold water from the northern part ol’ the
sea. The upper stratum ot this water is carried along
with the surtaee-current, and has to be compensated
by-water which finds along the bottom its way southward
from regions where the water of the sea has always a low
temperature throughout its entire depth.
The Storfjord, Spitzbergen. sends down its cold
water into the recess which the bank exhibits east of
South Cape. On the banks of West Spitzbergen, we
perceive at a depth of 100 fathoms the effect ol’ the
land-cold.
In the Greenland Polar current, we again fall in with
the cooling influence resulting from the pressure-minimum
of the deep in lat. 73»- 74» N and the currents flowing
round the banks of Jan Mayen.
Expeditionen !-7.
The Pommerauin Expedition 1-7:1.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
