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I)e meteorologiske Elementers
da^liire Periode i Sommermaanederne
i det europæiske Nordhav.
T\a der, saavidt mig bekjendt, ikke foreligger nogen
Be-J-’ stemmelser af de meteorologiske Elementers daglige
Perioder paa den Havstrækning, som den norske
Nord-liavsexpedition gjennemsejlede i Sommermaanederne 1876,
1877 og 1878, kar jeg anseet det for at være af Interesse
at se, hvilke Resultater vore timevise meteorologiske
Iagttagelser vilde give i denne Henseende.
Vistnok er Antallet af Dage, da Expeditionen var i
Søen, ikke betydeligt, paa samme Tid som den
gjennem-sejlede Strækning er forholdsvis lang, og Iagttagelserne
saaledes falde noget sparsomt fordelte paa det hele Felt, men
som et første Forsøg til Oplysning om en vigtig Gren af
Havets Meteorologi tror jeg, at de vundne Resultater kunne
have nogen Værdi. Expeditioner af den Art, som
Nord-havsexpeditionen, kan man kun sjelden gjøre Regning paa
i et Farvand som vort Nordhav.
Den Sammenstilling af Iagttagelserne i Grupper, hvis
Middelværdier ere benyttede til Beregningen af de daglige
Perioder, er fremgaaet af en Række Forsøg. Det blev
først forsøgt at beregne hver Maaneds Iagttagelser for sig,
men dette viste sig upraktiskt, da enkelte Maaneder kom
til at optræde med altfor faa Iagttagelser til at de
uperiodiske Variationer kunde blive nogenlunde ophævede i
Middeltallene. I Regelen er derfor den hele Observationsrække
benyttet for hver Sommer. Hvor de geografiske Hensyn
syntes at tale derfor, eller Observationerne selv antydede
det Hensigtsmæssige deri, udskiltes større Grupper inden
den enkelte Sommer. Saaledes udsondredes Iagttagelserne
af de fleste Elementer fra 1877 i 2 Grupper, den ene
omfattende dem, der varç gjorte i den varme Havstrøm
udenfor Norges Kyst, og den anden dem, der vare gjorte
indenfor den grønlandske Polarstrøm og under Opholdet ved
Den norske Nordhnvsexyedition. II. Mohn: Meteorologi.
Diurnal Period of the
Meteorological Elements during the
Summer Months in the European
Tract of the Northern Ocean.
As, to the best of my knowledge, no determinations have
hitherto appeared of the diurnal periods of the
meteorological elements throughout the tract of ocean investigated
by the Norwegian North-Atlantic-Expedition in the summer
months of 1876. 1877, and 1878, it will, I presume, be not
without interest, to show what results the hourly
meteorological observations taken on the Expedition would give in
this respect.
True, the number of days during which the
Expedition was at sea is not considerable; moreover, the distance
run being comparatively long, the observations are somewhat
sparingly distributed over the whole tract; but, as a first
attempt to elucidate an important branch of marine
meteorology, some value may, I think, be attached to the
results. Expeditions of the character of the Norwegian
North-Atlantic Expedition, will rarely be despatched to a
tract of ocean such as our Northern Seas.
The arrangement of the observations in groups, of
which the mean values served for computing the diurnal
periods, is based on a series of experiments. At first, the
observations of each month were computed by themselves;
this method, however, had to be relinquished, the
observations in some months being too few to admit of the
non-periodic variations being anything like satisfactorily eliminated
in the mean values. As a rule, therefore, I worked with
the whole series of observations for each summer. When
geographical considerations were in favour, or the
observations per se indicated the desirability of so doing, more or
less comprehensive groups were excluded from the whole
series for any one of the three summers. Thus, for instance,
the observations of most; of the elements for 1877 were
disposed in 2 groups, the one comprising those taken in
the warm ocean current off the coast of Norway, and the
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