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195
I Meteorologien reducere vi Barometerhøjderne til
Havfladen. Vi skulde reducere dem til en bestemt Niveauflade.
Som Pl. XLVIII viser, ligger Havets Niveau ved Christiania
omtrent 1.5 Meter højt, medens det ved Vardø kun ligger 0.9
Meter højt. Forskjellen er 0.6 Meter, hvortil svarer en
Forskjel i Barometerhøjden af <».05 mm. Da denne Størrelse
er Grændsen for den Nøjagtighed, hvormed vore
Stations-barometres constant« Correction er bestemt, har Havets
Niveauforskjel ingen praktisk Betydning for Lufttrykkets
Reduction til Niveauflade.
[Ide i Midten af Havet ligger Overfladen 1.5 m lavere
end Niveauet ved Christiania. Her bliver Reductionen til
det sidste over 0.1 mm. Dette er imidlertid en Størrelse,
som ikke overstiger den Usikkerhed, man i Almindelighed
kan paa regne ved Barometerobservationer paa Havet1. For
vort Lufttrykkart. Pl. XXXI, er den, med dettes
Usikkerhed, af ringe Betydning.
resulting from the great rivers, the Oder and the Vistula,
the water of which is carried east, towards Memel.
In meteorology, it is the custom to reduce the heights
of the barometer to the sea-level. We should rather
reduce them to a given surface of level. As shown by
Pl. XLVIII, the level of the sea at Christiania lies about
1.5 metre high, whereas at Vardø it lies only 0.9 metre
high. The difference is 0.6 metre, to which corresponds
a difference in the height of the barometer of 0.05 111111.
As this quantity represents the limit of accuracy with
which the constant correction of our Station-Barometers is
determined, the difference in the sea-level has no practical
importance for the reduction of atmospheric pressure to
a surface of level.
I11 the middle of the Sea, the surface lies 1.5 111. lower
than the level at Christiania. There, the reduction to the
latter will be more than 0.1 111111. Meanwhile this is a
quantity that does not exceed the uncertainty we as a rule
may expect with barometric observations at sea.1 As
regards our Map of Atmospheric Pressure, Pl. XXXI. with
its inherent uncertainty, it is of trifling importance.
14. Slutningsbemerkninger.
I den foreliggende Afhandling liar jeg sögt at
begrunde Vandets Beva’gelse i vort Nordhav som en Følge
saavel af de normale Vinde som af Ulighederne i Vandets
Tæthed. Den første Aarsag er den overvejende, men den
sidste har ogsaa sin fulde Betydning. Jeg betragter dette
Arbejde som et Forsog, dog ikke som en blot og bar Hypothese,
men som en ved consekvente Beregninger gjennemført
Iderække, der, udgaaende fra kjendte Kræfter og deres
Virke-maade. har ledet til Resultater, som i mange Henseender og i
mange Punkter stemme overens med de af Observationerne
givne virkelige Forhold. De Coefficienter, jeg har benyttet,
f. Ex. Forholdet mellem Vindhastighed og Strømhastighed,
Grændsefladens Dybde, trænge til yderligere Verification, og
de numeriske Data have for vigtige Punkters Vedkommende
vieret magre, navnlig gjælder dette Søvandets specifiske Vægt,
Lufttrykkets Fordeling over Havet og tildels Dybderne.
Jeg maa bede erindret, at da vi i 1876 rejste ud paa vor
Expedition, havde jeg ikke nogen bestemt Tanke 0111, at
det skulde blive muligt at række saa langt med mine
Studier som til den oceaniske Circulation. Alt var da
ubekjendt. og Dybder, Temperatur og Vandets chemiske
Egenskaber indtoge den første Plads i vore Tanker. At det
har været mig muligt at føre Arbejdet saa vidt, som skeet
er, skyldes for en væsentlig Del mine Medarbejdere,
Com-mandørcaptein W ille, der havde organiseret Lodningerne,
og lians Officierer, der assisterede ham i deres Udførelse,
Captein Petersen og Captein Grieg, Professor Waage, der
organiserede de chemiske Arbejder, og Chemikerne Svend-
1 Don norskeNordhavs-Expedition. Meteorologi. Af H. Mohn.
Side 40.
14. Concluding Remarks.
In the present Memoir, I have sought to explain the
motion of the water in the North Ocean as produced alike
by the normal winds and the differences in the density
of the water. The former cause predominates, but the
latter too has full significance. I regard this research
as an attempt, not indeed as a mere hypothesis but as a
series of ideas carried out by consistent computations,
which, proceeding from known forces and their mode of
action, have led to results that in many respects and 011
many heads agree with the actual results given by the
observations. The coefficients made use of, e. g., the
relation between the wind-velocity and the current-velocity,
the depth of the limiting-surface, need additional
verification, and in many important points the numerical data
have proved but meagre: this applies in particular to the
specific gravity of the sea-water, the distribution of atmospheric
pressure over the sea, and partly to the depths. The reader
must bear in mind that, when, in 1876, we started on our
Expedition, I had 110 definite idea of being able to advance
so far with my studies as oceanic circulation. All was
then an unknown field of research, and depth, temperature,
and the chemical properties of water laid claim to the
first place in our labours. The possibility of my having
carried 011 the investigations to so advanced a stage, must be
ascribed in great measure to my colaborators: Commodore
Wille, who organised the soundings, and his officers, who
assisted liim in taking them, Capt. Petersen and Capt.
Grieg; Professor Waage, who organised the chemical work,
1 The Norwegian North-Atlantic Expedition. Meteorology.
By H. Mohn. P. 40.
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