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25
Man gaar først efter Linien Anclø—Jan Mayeil ud i
Ishavsdybet, undersøger dette og dets Skraaninger paa begge
Sider. Omkring Nordøstenden af Jan Maven som Centrum
foretages nogle kortere Rækker Lodskud mod Nordøst, mod
Nord og mod Nordvest. Paa dette Strøg nemlig, der
antages at danne den islandske Vulkan-Regions yderste
Forbjerg mod Nordøst, synes Bunden at falde særdeles bråt
af mod Dybet til de nævnte Sider.
Under den sandsynlige Forudsætning, at Adgangen til
Jan Maven ikke er spærret af Is. forsøges det at lande
paa Øen til Foretagelse af Undersøgelser i geografisk,
geologisk. hydrografisk, zoologisk, botanisk Retning ni. v.
En Undersøgelse af Naturforholdene i Havet paa
Vest- og Sydsiden af Jan Mayen søges udført. Der er
nemlig Grund til at antage, at Jan Mayen er forbundet
med Island ved en undersøisk Ryg.
For at undersøge Forholdene paa Grændsen mellem
den varme Overfiadestrøm fra Atlanterhavet og den kolde
Polarstrøm i Grønlandshavet, opsøges Grønlandsisen i
Nordvest for Jan Mayen. Naar Undersøgelserne langs et Stykke
af Grønlandsisen ere afsluttede, styres til et Punkt omtrent
midtvejs mellem Island og Jan Mayen, og derfra undersøges
Tversnittet over Ishavsdybet i Retning af Ranen. Herved
vil man kunne faa rede paa den formodede undersøiske
Ryg mellem Island og Jan Maven. Naar det sidstnævnte
Tversnit er oparbejdet indtil dets tidligere undersøgte
norske Umbellularia-Region, sejles til Tromsø, under
Forudsætning af. at Tiden senere tillader, i August, fiere
Arbejder nordenfor Tromsø.
Naar Juli Maaned antages medgaaet til Jan
Mayen-Turen; vil den første Halvdel af August kunne anvendes
til Undersøgelse af Bankerne, Havbroen og endel af
Ishavsdybet mellem Norge og Syd-Spidsbergen. Som Østgrændse
sættes Linien Nordkap. Bjørneøen, Sydkap.
Den sidste Halvdel af August vil tiltrænges til
Tilbagerejsen til Bergen og Desarmering.
Her course west will at first coincide with a line
extending from Ando to Jan Mayen, and thence to the Arctic
Ocean, the basin and slopes of which the Expedition has
to investigate. From the north-eastern extremity of Jan
Mayen will be taken a few short series of soundings in a
north-easterly, a northerly, and a north-westerly direction:
for off this point, which is supposed to form the
northeastern promontory of the valcanic region of Iceland, the
bottom would appear to sink precipitately in those
directions.
On the probable assumption that Jan Mayen is not
inaccessible from ice. the Scientific Staff will land on the
island, and prosecute exploratory work in divers branches
— geographical, geological, hydrographical. zoological,
botanical, &c.
The physical _ and biological conditions of the sea off
the western and southern shores of Jan Mayen, should if
possible be investigated, there being some reason to infer
that a submarine ridge connects that island with Iceland.
To investigate the conditions where the warm
surface-current from the Atlantic meets the glacial Polar flow in
the Greenland sea. the Expedition Will stand north-west of
Jan Mayen when making for the Greenland ice-barrier.
After exploring part of the Greenland ice-barrier, the
Expedition will proceed to a point about midway between
Iceland and Jan Mayen, and from thence investigate the
bed of the Arctic Ocean in the direction of Ranen. The
existence or non-existence of a submarine ridge
connecting together Jan Mayen and Iceland will then be
definitively settled. When the last-mentioned section of the
Arctic basin has been explored throughout, irrespective of
its Norwegian Umbdlularia region, investigated previously,
the Expedition will return to Tromsö. provided there be
time for subsequent exploratory work (in August) north of
that port.
If, as expected, the "Expedition get back from Jan
Mayen by the end of July, the first half of August can be
devoted to further investigation of the banks, and part of
the Arctic basin between Norway and the southern
extremity of Spitzbergen. A line tangent to the North Cape.
Beeren Eiland. and South Cape marks the eastern limit of
the tract to be explored.
The latter half of August , will be needed for the
passage home to Bergen, and for discharging the vessel.
De videnskabelige Arbejder udføres væsentlig paa
samme Maade som i 1876.
Ved de zoologiske Arbejder lægges ved Siden af
Fangst med Ski-abe, Trawl og Svabere, særlig Vægt paa
Anvendelse af Drivgarn og Net i intermediære Dybder,
. samt Fiskeri paa Bankerne. Paa Jan Mayen antages
Fuglefangst at burde være Gjenstand af Betydning og ved
Grønlandsisen muligens Fangst af Sæl og Isbjørn m. ni.
Den norske Nordhavsexpedition. C. Wille: Expeditionen Historie.
The scientific work of the Expedition to be carried
out in all essential particulars as in 1876.
With regard to the zoological work, especial stress
is laid on the use of the surface-net. and of the drag-net
in intermediate depths, apart from that of the dredge,
trawl, and swabs, .as also on fishing when exploring the
banks. During the stay at Jan Mayen, some time should,
it is thought, be devoted to collecting ornithological spec-
4
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