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114
gramdset af Isobaren for 755.8 mm. Indenfor denne tindes
to partielle Minima, et østenfor Island, hvor Lufttrykket
gaar ned til lidt under 755.3 mm, og et vestenfor
Nordkaj». hvor det laveste Lufttryk netop naar denne Værdi.
Mellem disse Minima stiger Lufttrykket ikke højere end til
henimod 755.11 mm, paa 67».5 N. Br. og 0» Lgde. Den
østlige Del af Island danner en barometrisk Højderyg paa
755.7 mm mellem det grønlandsk-islandske og det norske
Havs Minima. Imellem Nordgrønland og Nordspidsbergen
gaar Lufttrykket op til over 7(11 mm. Dot samme
Lufttryk findes i det sydøstre Hjørne af Kartet i Øst-Preussen
og Busland. I den centrale Del af den skandinaviske Halvø
er der et Secundært Maximum paa 759.5 mni.
an elongated minimum, bounded ln Ille isobar for 755.0 min.
Within this isobar, occur two partial minima, ono east
of Iceland, where the atmospheric pressure goes down to
a little under 755.3 nun., and one west of the- North Cape,
where the lowest atmospheric pressure just roaches that
value. Betwixt these minima, the pressure does not rise
higher than about 755.fi mm. in lat. 67».5 N and long. 0».
The eastern tract of Iceland constitutes a. barometrical ridge,
with a pressure of 755.7 mm., extending between the
Greenland-Icelandic and the Norwegian-Sea minima. Again,
between North Greenland and North Spitsbergen, the
pressure reaches upwards of 7(11 mm. An equal
atmospheric pressure occurs in the south-eastern corner of
the map, viz., in Bast Prussia and Russia. Over the central
region of the Scandinavian peninsula, occurs a secondary
maximum, with a pressure of 759.5 mm.
2. Vimlen.
The Wind.
For at finde den midlere eller resulterende Retning
og Hastighed af vinden paa vort Nordhav har jeg
benyttet følgende Formler, der udtrykke den barisko Vindlov1.
Er:
O den barometriske Gradient, udtrykt i Millimeter
absolut (reduceret til Norinaltyngden) Kviksølvhøjde ved
II», per midlere Meridiangrad eller 111 Kilometer
(10 001)01)0 m:90 = 111.111 Kilometer),
= 13.59593
Factor, d
i øoii ooii = 0.00012236 |log,, = 6.08765], en
r reducerer Gradienten til Trykforskjel i
den geografiske Bredde,
har man følgende Formler:
’- ff sin rr = 2 w r sin u
ff
k v
Kilogram (Normaltyngde) per Kvadratmeter (13.59593
er Kviksølvets specifiske Vægt vod 0»),
Massen af en Kubikmeter Luft eller det af Tyngden
foraarsagede Tryk af en Kubikmeter Luft paa et
horisontalt Underlag, divideret med Tyngdens
Acceleration,
Vindens Afbøjningsvinkel, regnet fra Gradientens Ret-’
ning,
• lordens Omdrejningsbastighed = 2,/ : 86164.09 =
0.00007292 [log 2 ei = 6.16388],
Vindens Hastighed i Meter per Second,
ten.
In order to find the mean or resulting direction
and velocity of the wind throughout file North Ocean, 1
have made use of the following formute, that express the
baric wind-law. 1 Let
ff he the barometrical gradient, expressed in millimetres
and absolute (with reduction to normal gravity) height
of mercury at 0°. per one mean degree of meridian,
or 111 kilometres (10 000 000 in.: 90 = 111.111
kilometres) ;
f, = 13.59593 |00^0UU = 0.00012236 [log ,,= 6.087651, a
factor which reduces the gradient to difference of
in kilogrammes (normal gravity) on a square
(13.59593 = the specific gravity of mercury
at 0°);
the mass of a cubic metre of air, or the pressure caused
by the weight of a cubic metre of air on a horizontal
base divided by the acceleration of gravity;
a the wind’s angle of deviation, computed from the direction
of the gradient;
w the earth’s velocity of rotation = ■>., : 86164.09 =
0.00007292 j log 2 ei = 6.16388|;
v the velocity of the willd, in metres per second;
k the friction-coefficient;
ip the latitude;
aud we have the following formute: —
" ff sill ff = 2 w r sin it
l’ ’
" Il eos ff = k l’
’ –––-a <* si" ’l
’ Etudes .111’ Ira mouveiueuts .lo. l’atmoBpllére par C. M.
Guld-berg ol fl. Mohn, S. JO. Zeitsolirift der Haterreichincheu Oesellnobaft
ftir Meteorologis, IsTT, S. :>’->. Sprung, Lohrbucli .lel- Meteurologie,
S. I _’0.
■ Kf.niles sur len monvement» do l’atmosphéic par C. M.
«uldborg ol H. Mobil, p. 20. Zoitschrift dov .".«lorreicliiscli™ «„»oU.ohaf’t
flir Meteorologis, IK77, p. Spinas. Lclirbueh dor Moloimilogio,
p. 120.
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