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J»8
Østlandet. Aar (Year). 8 a.m. 2 p.m. 8 p.m.
Dovre 16 1865—80 -}- 0.24""" —0.24""* —o.oi"1"
Christiania 15 67—81 -f- 0.44 —0.16 —0.28
Sandøsund 20 61—80 +0.19 +0.16 —0.35
Efter Observationerne fra det astronomiske
Observatorium i Christiania har Lufttrykket i Sommermaanederne et
Maximum ved Kl. 9 Morgen og et Minimum ved Kl. 5—6
Eftermiddag. Natte-Maximum og Minimum falde bort. Den
hele Amplitude er henimod 0."""9. Dovre synes at have en
lignende Periode; i Sandøsund synes Morgenmaximum at
falde noget senere, ialfald begynder den raske Synken først
efter Kl. 2 Eftm. Vi møde her, navnlig i Christiania, den
bekjendte periodiske Gang med en temmelig stor Amplitude.
Stille vi Christiania og det norske Hav sammen, efter
Afvigelserne fra Dagsmediet, faa vi følgende Tabel:
2 a.m. 4 6 8 10 122 p.in. 46 8 10 12 p.m.
Christiania +0.23+0.26+0.32+0.35+0.32 +009 —0.25—0.50—0.53—0.37—0.08 +0.16
Norske Hav (Norwegian Sea) —0.17—0.29—0.22—0.12—0.01 +0.15 +0.24 +0.20 +0.12 +0.06 +0.06 0.00
Forskjel (Difference) 4-0.40 +0.55 +0.54 +0.47 +0.33 —0.06 —0.49 —0.70 —0.65 —0.43 —0.14 +0.16
According to the observations taken at the
Astronomical Observatory in Christiania, the pressure of the air
in the summer months has a maximum at 9 o’clock in the
morning and a minimum at 5 to 6 o’clock in the afternoon.
The night maximum and minimum disappear. The total
range is about 0.mm9. Dovre would appear to have a
similar period; at Sandøsund the morning maximum would
appear to occur somewhat later; at all events, the rapid
fall does not commence till after 2 o’clock in the afternoon.
Here — particularly in Christiania — the known periodical
variation has a rather large range. On comparing
Christiania with the Norwegian Sea, as regards the deviations
from the daily mean, we obtain the following Table: —
Mellem Middag og Kl. 10 Aften er der, samtidig,
Overskud af Luft over Havet og det skorter paa Luft over
Landet, mellem Midnat og Kl. 10 Formiddag er der,
samtidig, Overskud af Luft over Landet og det skorter paa
Luft over Havet.
Til Oplysning om Lufttrykkets daglige Periode i
Sommermaanederne paa Randen af Grønlandshavet tjene
følgende Resultater fra den svenske Expedition til Spidsbergen
1872—73 og den tyske Expedition til Østgrønland 1869—
70. Efter de af Dr. A. Wijkander i "Observations
météo-rologiques de l’expédition arctique Suédoise 1872—73" Side
98 meddelte timevise Observationsmedia for Juni findes
(Mosselbay) følgende observerede Afvigelser fra Middel af
Kl. 8, . 2 og 8:
+ 0.05 0.00 — 0.06
altsaa et Formiddagsmaximum og et
Eftermiddagsmini-mum.
Ved grafisk Udjevning tindes endvidere:
Maximum Kl. 11 a.m. + 0.08 mm Minimum Kl. 7 p.m. — 0.11mm
„ Midnat +0.05 „ „ 6 a.m. — 0.01
Perioden er altsaa den sædvanlige, med noget
forsinkede Epoker for Vendetiderne. Amplituden er liden,
kun O.""» 19.
Efter de af Capt. K. Koldewey i "Zweite Deutsche
Nordfahrt IV, Meteorologie und Hydrographie," Side 604
Between noon and 10 p.m. there is simultaneously a
surplus of air above the sea and a comparative lack of air
above the land; between midnight and 10 a.m. there is a
surplus of air above the land and a comparative lack of air
above the sea.
With a view to elucidate the diurnal period of the
pressure of the air in the summer months at the borders of
the Greenland sea, I will here cite the following results
obtained on the Swedish Expedition to Spitsbergen, 1872 and
1873, and on the German Expedition to East Greenland,
1869 and 1870. From the hourly observed means for June
(Mossel Bay), communicated by Dr. A. Wijkander in
"Observations météorologiques de l’expédition arctique Suédoise,
1872 — 1873," p. 98, are found the following observed
deviations from the mean of 8A, 2A, and 8m.
-f- 0.05 0.00 — 0.06,
accordingly a maximum in the morning and a minimum in
the afternoon.
Furthermore, by drawing a free hand curve I
found: —
Maximum 11 a.m. +0.08"""; Minimum 7 p.m. —0.11"""’.
„ 12 p.m. +0.05 ; „ 6 a.m. —0.01.
The period is therefore that commonly found, with
somewhat retarded epochal hours. The total range is small,
only 0.mm19.
According to the means for every alternate hour during
the months of June, July, and August, communicated by
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