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109
meddelte Medier for liver anden Time for Maanederne Juni,
Juli og August tindes følgende Afvigelser fra Mediet for
Kl. 8, 2 og 8:
+ 0.07 -f 0.05 —0.11
altsaa antydende et Formiddagsmaximum og et
Eftermid-dagsminimum. Af de Side 606 meddelte grafiske
Fremstillinger "Tafel III b. Sommer" findes:
Maximum Kl. 11 a.m. + 0.13mm; Minimum Kl. 6p.m. —0.12mm.
„ „ 11 p.m.+0.08 ; „ „ 4 a.m. 0.04
altsaa en lignende Periode som paa. Spidsbergen, men med
en noget større Amplitude, nemlig 0.’"m25.
Paa de isbekrandsede Kyster af Grønlandshavet lindes
altsaa, omend med ringe Amplitude, den sædvanlige daglige
Periode for Lufttrykket, med noget forsinkede Epoker for
Yendetimerne, ligesom paa de britiske Kyster.
Efter "Contributions to our Knowledge of the
Meteorology of the Antarctic Regions, Published by the
Authority of the Meteorological Committee, London 1873"
Side 24 og 26, beregnes for den antarctiske Zone mellem
60° og 78° Syd Bredde, altsaa nær eller i det antarctiske
Drivisbelte, for Maanederne Januar og Februar, den
antarctiske Sommer, følgende Afvigelser fra Mediet for Kl. 8,
2 og 8:
+ 0.02 + 0.02 — 0.04
der antyde et Formiddagsmaximum og et
Eftermiddags-minimum, ganske som i de to ovenanførte Tilfælder.
Observationerne give i Medium for Januar og Februar:
Maximum Kl. 3 a.m. +0.08""", Minimum Kl. 6 p.m. -0.12mm.
Middag +0.05 , ,, „ 9 a.m.+0.02
altsaa den sædvanlige Periode med 2 Maxima og 2 Minima
og en Amplitude af 0.""n20.
Betragter man Karterne over Størrelsen af
Barometrets Synkning fra Formiddagsmaximum til
Eftermiddags-minimum i Alexander Buch an’s 11 On the Diurnal
Oscillations of the Barometer, Part I" i Sommermaanederne, saa
ser man, at den nordligste Linie for Variationen — 0.in010
rz — 0."""25, gjør en stor Bøjning ned i det nordlige
Atlanterhav. Den aabner saaledes Rum for et særskilt Parti i det
norske Hav for sluttede Linier for Værdier med modsat
Fortegn, det er for et Parti, i hvilket Barometret stiger
fra et Morgenminimum til et Eftermiddagsmaximum. Dette
Parti findes, som Observationerne fra vor Expedition, fra
Norges Nord- og Vestkyst og fra Færøerne og Islands
Østkyst vise, i det norske Hav og tilgrænsende Kystpartier.
Dets Grændselinie gaar i Norge lidt indenfor Kysten, over
Fjordenes ydre Del, over Midten af Østhavet, og vestenom
Capt. K. Koldewey in "Zweite Deutsche Nordfahrt IV,
Meteorologie und Hydrographie," p. 604, the following
deviations are found from the mean for 8A, 2h. and 8A: —
+ 0.07 +0.05 —0.11,
indicating, therefore, a forenoon maximum and an afternoon
minimum. From the diagram, p. 606, Pl. Ill b, summer,
are found —
Maximum 11 a.m. +0.13"""; Minimum 6 p.m. —0.12fflm.
„ 11 p.m. + 0.08 ; „ 4 a.m. — 0.04.
a period, therefore, similar to that at Spitzbergen, but with
a somewhat greater total range, viz. 0.mm25.
On the ice-bound shores of the Greenland Sea we
find, accordingly, though with a small range, the usual
diurnal period for the pressure of the air, — the epochal
hours being however somewhat retarded, as on the British
coasts.
From "Contributions to our Knowledge of the
Meteorology of the Antarctic Regions," published by the Authority
of the Meteorological Committee, London 1873, pp. 24
and 26, I have computed for the antarctic zone, between
60° and 78° S. lat., accordingly either near or in the
antarctic belt of drift-ice, for the months of January and
February — the antarctic summer — the following deviations
from the mean for 8A, 2A, and 8A: —
+ 0.02 + 0.02 — 0.04,
indicating a forenoon maximum and an afternoon minimum,
precisely as in the two aforecited cases. The observations
give as the mean for January and February —
Maximum 3 a.m. +0.08"""; Minimum 6 p.m. —0.12mm.
„ noon +0.05 ; „ 9 a.m. +0.02.
the usual period, therefore, with two maxima and two
minima, and a total range of 0.mm20.
If we examine the Plates showing the fall of the
barometer from the forenoon maximum to the afternoon
minimum in Alexander Buchan’s work uOn the Diurnal
Oscillations of the Barometer," Part I, in the summer
months, the most northerly line, for the variation — 0.’"010
=z — 0."""25, will be seen to make a wide bend into the
northern region of the Atlantic. It leaves therefore ample
room for a separate tract in the Norwegian Sea, through
. which to draw continuous lines, representing values with
reversed signs, i. e. for a tract in which the barometer
rises from a morning minimum to an afternoon maximum.
Such a tract, as shown by the observations taken on our
Expedition, on the north and west coasts of Norway, at the
Færoe Islands, and on the east coast of Iceland, actually
exists in the Norwegian Sea and along the adjacent coasts.
Its boundary extends from a little within the shores of
Norway, crossing the outer parts of the fjords, through the
middle of the Barents’ Sea; it then passes south and west
of Spitzbergen, east of the east coast of Greenland, -across
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