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26
Ved Lodskuddene søges bestemt Bankernes Fonn og
Udstrækning, samt den Maade, paa hvilken Bunden falder
af fra disse til de største Dybder i Ishavsdybet. Det er
af fundamental Betydning for Forstaaelsen af Havets og
de tilgrændsende Landes orografiske og geologiske Forhold,
ligesom for Dyrelivets Udbredelsesforhold, at faa afgjort,
om Bunden falder jevnt af mod Dybet, eller om den falder
af i Trin, Terrasser eller Afsatser med mellemliggende
Plateauer. Lodskuddenes Plads og Antal bestemmes
derfor med disse Hensyn for Øje.
Maalingerne af Havets Temperatur i Dybet udføres
i den Udstrækning, som er nødvendig til en sikker
Bestemmelse af Dybets Isothermer i de efter denne Plan
opgaa-ede Tversnit. Der tages Hensyn til det hensigtsmæssige i,
at Punkterne i Tversnittene ogsaa kunne anvendes til
Længdesnit. De nyeste Dybvandsthermometre anvendes saa
ofte som muligt ved Siden af det ifjor brugte.
Ved hvert Lodskud tages Vandprøve fra Dybet og
paa udvalgte Steder fra intermediære Dybder. Alle
Vandprøvers specifiske Vægt- bestemmes.
Vecl hvert Lodskud tages Bundprøver, der opbevares
til videre Undersøgelse. Af de med de zoologiske
Fangstapparater optagne og sigtede Materiale af Havbunden tages
Prøver til Opbevarelse.
De chemiske Arbejder udføres væsentlig som ifjor.
Den specifiske Vægt af Havoverfladens Vand bestemmes en
til to Gange daglig, og oftere paa Steder, hvor
Strømforhold eller andre Forhold gjøre det ønskeligt.
Iagttagelsen af. Strømmen i Havet søges udført, naar
Naturforholdene gjøre det ønskeligt og Vejrforholdene muligt.
Magnetiske Observationer søges udført ombord i Søen.
navnlig lægges Vægt paa Erholdelsen af
Misvisningsobser-vationer. Absolute Bestemmelser søges udført paa Røst og
paa Grønlandsisen, foruden ved Bestemmelsen af Skibets
magnetiske Constanter i Husø, og desuden, hvor
Lejligheden ellers maatte findes, som i Bergen. Bodø. Tromsø m. fl.
Geologiske Undersøgelser foretages paa Jan Mayen,
om Landgang der er mulig, i al den Udstrækning, som
Forholdene tillade. Paa Jan Maven vil
astrononiisk-geo-grafiske Stedbestemmelser, topografiske og hydrografiske
Undersøgelser være af største Interesse at faa udført. En
Stedbestemmelse paa Røst — i Forbindelse med de
magnetiske Observationer — vil være ønskelig, da Stedet ikke
er forbundet med det trigonometriske Net.
imens; and at the Greenland ice-barrier there might,
perhaps. be opportunity of capturing a few seals, with an
occasional shot at a Polar bear.
Deep-sea soundings will be taken to determine the
contour and extent of the coastal banks, as also their
slope, or how the bottom shelves down into the greatest
depths of the Arctic Ocean. It is a point of
fundamental importance in studying the orographical and
geological conditions of the sea and the countries it surrounds,
and the distribution of animal life in the ocean, to find whether
the bottom slopes gradually down to the depths, or descends,
as it were, step by step, in terraces, with interjacent
plateaus. Hence, the position and number of the soundings
will have’ to be determined with this object in view.
The temperature of the sea will be taken to the
ex-tent required for an indisputable determination of the
isotherms of the transverse sections explored in accordance
with the present scheme. Attention is directed to the
position of the observing points in the transverse sections,
which should admit of their being applied to longitudinal
sections. Whenever practicable, the temperature shall be
registered With the latest deep-sea thermometers as well as
with the instrument used on last year’s cruise.
With every sounding, a sample of water shall be
brought up from the bottom, and in specially selected
localities also from intermediate depths. All the samples
to have their specific gravity determined.
With every sounding, a sample of the bottom shall
be obtained, and preserved for subsequent examination.
Samples of the sifted material brought up from the bed of
the ocean with the dredge or trawl will also be preserved.
In the chemical work there will be no essential change.
The specific gravity of the surface-water shall be registered
once or twice a day, and more frequently in localities
where the action of currents or other exceptional
conditions may render it desirable.
Observations on ocean-currents will be made
wheresoever the attendant physical conditions may render them
desirable and the state of the weather practicable.
Magnetical observations shall, if possible, be taken at
sea. especial stress being laid on obtaining determinations
of the variation of the compass. Absolute determinations
shall, if possible, be performed at Røst and on the
Greenland ice, exclusive of those for the ship’s magnetic
constants to be made at Husø; and wheresoever else
opportunity may be afforded, as at Bergen. Bodø. Tromsø etc.,
and other places.
Geological investigations will be undertaken on the
island of Jan Mayen, should the Expedition succeed in
landing there. Peculiar interest would likewise attach to
astronomical determinations of latitude and longitude, as
also to topographical and hydrographical observations made
on that island. In connexion with the magnetical
observations instituted at Rost. it will be desirable to perform
determinations of latitude and longitude, that locality not
being included in the trignometrical net of the country.
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