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105
Efter denne findes:
1 Maximum: + 0.ram24. 2* 15" p.m.
2 „ -f 0.«"06. 10* 15" p.m.
Amplitude: 0.mm53.
Da den saaledes fundne daglige Periode for Lufttrykket
paa Havet i Sommer maanederne er saa afvigende fra den
ellers bekjendte Periode, kunde man fristes til at tro. at
den ikke havde nogen reel Betydning, men at den beroede
f. Ex. paa en mangelfuld Reduction ai de observerede
Værdier. For at undersøge dette Forhold har jeg gaaet
frem paa følgende Maade:
Ved Hjelp af de paa de norske meteorologiske
Kyst-Stationer samt paa Færøerne og Island1 3 Gange daglig
gjorte Barometer-Iagttagelser lader der sig anstille en
Sammenligning mellem vore Resultater fra Havet og Barometrets
daglige Periode paa Kysten. Idet jeg udtog af
Observa-tionsrækkerne de Dage, der ere benyttede til Bestemmelsen
af Perioden paa Havet, og behandlede Observationerne fra
Kyststationerne aldeles paa samme Maade som de ombord
gjorte, idet Middelværdierne for hver af de 3
Observations-klokkeslet corrigeredes for Barometrets absolute Variation
fra Begyndelsen til Enden af hver Række af benyttede
Dage, derpaa tog Medium af de tre daglige Observationers
Media og beregnede hver af de 3 første Medias Afvigelse fra
dette sidste Medium (positiv naar det første er højere end
det sidste), fik jeg følgende Resultater:
From this we find: -
1 Minimum: —0.m’"29, 4A 15™ a.m.
2 „ -f ü.""05, 9A 0" p.m.
Total Range 0.—53.
The diurnal period of the pressure of the air found
at sea, as described above, in the summer months deviating
so widely from the period otherwise known, it might be
reasonably supposed to have no real significance, but to lie,
for instance, in a defective reduction of the observed values.
With a view to investigate this question, I have proceeded
in the following manner.
By referring to the barometrical observations taken
at the Norwegian meteorological coast-stations and those
at the Færoes and Iceland1 (3 times a day), a comparison
may be made between the results of our observations at
sea and the diurnal period of the barometer on the coast.
Extracting from the series of observations the days from
which the period at sea was determined, I treated the
observations from the coast-stations precisely in the same
manner as those taken on board, correcting the mean value
of each of the 3 hours of observation for the absolute
variation of the barometer from the beginning to the end
of each series of days, after which I took the mean of the
means of three daily observations, and computed the deviation
of the first means from the said mean (positive when the former
is higher than the latter), and obtained the following results: —
1876. 8 a.m. 2 p.m. 8 p.m.
Florø —0.27"™ +0.25""" -j- 0.02mm.
Christiansund —0.39 -I-0.21 +0.18.
Brønø —0.27 +0.23 +0.05.
Samtlige Stationer udvise et Minimum i
Morgentimerne og et Maximum om Eftermiddagen, ligesom
Observationerne fra Expeditionen. Tages Middel af de 5
Kyststationer, faar man
8 a.m. 2 p.m. 9 p.m.
Thorshavn 0.00""" —0.07mm -}-0.07fflm.
Berufjord -0.24 +0.11 +0.14.
All the stations show a minimum in the morning
hours and a maximum in the afternoon, as with the
observations from the Expedition. If we take the mean derived
from the 5 coast-stations, we get —
8 a.m. 2 p.m. 8,9 p.m.
Kyststationer —0.23""" +0.15""" -f- 0.09Coast-Stations.
Expedition 1876 —0.04 +0.19 —0.16. Expedition.
1877. 8 a.m. 2 p.m. 8 p.m.
Brønø 0.00""" -f- 0.06mm —0.06""".
Bodø —0.09 +0.15 —0.06.
Tromsø —0.16 —o.01 +0.17.
Middel {Mean) —0.08 +0.07 +0.01.
Expedition 1877 —0.23 +0.13 -(-o.io.
Altsaa utter begge Minimum 0111 Morgenen, Maximum
0111 Eftermiddagen.
1 Meteorologisk Aarbog, udgivet af det danske meteorol. Institut,
Don norske Nordlmvsexpedition. H. Mohn: Meteorologi.
Thus, both with a minimum in the morning and a
maximum in the afternoon.
"Meteorologisk Aarbog, udgivet af det danske meteorol. Institut."
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