Stigning af Trykket, hvilket allerede ved Kysterne giver sig 
tilkjende i Forsinkelsen af Morgenmaximumet og Efter- 
middagsminimumet. Om Aftenen og Natten vender Pro- 
cessen sig om; der flyder Luft i de højere Lag fra Havet 
til Land, her stiger Trykket, paa Kysten synker det og 
Aftenmaximum bliver lidet.” Vi kunne her tilføje: paa 
Havet naar Trykket sit Minimum tidlig om Morgenen, medens 
det paa Land naar sit Maximum lidt senere. Se oven- 
staaende Sammenligning mellem Christiania og Havet. 
Den Betydning, som Forskjellen mellem Land og Hav 
har for Lufttrykkets daglige Periode, hvilken allerede er 
antydet af Buchan,' H. E. Eaton? F. Chambers’ og J. 
Hann, faar saaledes sit fyldigste Udtryk om Sommeren 1 det 
norske Hav, hvor Lufttrykket er — forholdsvis — hojt, naar 
det er lavt over Land, og lavt, naar det er højt over Land. 
Luftens Temperatur. 
1876. 
De samme 31 Dage ere anvendte som til Beregningen 
af Luftens Tryk. 
111 
increase of pressure, which, even on the coast, asserts itself 
by retarding the morning maximum and the afternoon mini- 
mum. In the evening and at night this process is reversed: 
a current of air, in the higher strata, flows from the sea 
to the land; here the pressure increases, diminishing on the 
coast, and the evening maximum becomes inconsiderable.” 
We can add, that at sea the pressure reaches its minimum 
early in the morning, whereas on land the maximum is 
reached somewhat later. See comparison, 
between the diurnal period in Christiania and that at sea. 
The influence exerted by the difference between the 
given above, 
physical conditions of the land and the sea on the diurnal 
period of the pressure of the air. which has been already 
pointed out by Buchan,’ H. E. Haton,? F. Chambers,°® and 
J. Hann, is most clearly shown during summer in the 
Norwegian Sea, where the pressure of the lower air is 
— relatively — high when it is low above the land, and low 
when it is high above the land. 
Temperature of the Air. 
1876. 
The days (31) were the same at those devoted to 
computing the pressure of the air. 
Den (on the) 27 Juni (of June), 12” p.m. var Temperaturen (the temperature was) 11.90. 
pr) pp) 
8 Juli (of July), , » 
: 10.5. 
Forskjel (Difference) 
OMS 2 IL = OLOD = @ 
Den (on the) 16 Juli (of July), 12" p.m. var Temperaturen (the temperature was) 10.°7. 
92 
4 29 26 39 ry) 29 br) 
ND), 
Forskjel (Difference) | 
« 
2 29 13 9 pr) vy) pp) 
1.09: 10=00189=e 
Den (on the) 3 Aug. (of Aug.), 12" p.m. var Temperaturen (the temperature was) 8.98. 
10.00. 
Forskjel (Difference) 
For den hele Gruppe bliver c= + 0.0016. 
— ( PoiO=]=— OUR =e 
For the whole group c= ++ 0.016. 
am» 
Klokkeslet på på av 4h 5 6” GJ 8? OG 10” mre ae Hour. 
Corr. Obs.media 10.23 10.16 10.16 10.18 10.17 10.19 10.32 10.40 10.60 10.74 10.90 10.90 Corr. obs. means. 
Afv. fra Dagsmedium —0.29 —0.36 —0.36 —0.34 —0.35 —0.33 —0:20 —0.12 0.08 0.22 0.38 0.38 Diff.fromdaily mean. 
Beregnet Afvigelse —0.30 —0.33 —0.36 —0:37 —0.36 —0.30 —0.21 —0.09 0.06 0.21 0.36 0.46 Computed difference. 
Forskjel: Obs. — Ber. 0.01 —0.03 0.00 0.03 0.01 —0.03 0.01 —0.03 0.02 0.01 0.02 —0.08 Diff.: obs. — comp. 
1 Op. cit. (1875). 
* Quarterly Journal of the Meteorological Society. Vol. IV, No. 
26, (1878). 
5 Samme, Vol. V (1879). 
LE TOps cit) (SiS): 
* Quarterly Journal of the Meteorological Society. Vol. IV, No. 
26 (1878). 
3 Tbid, Vol. V (1879). 
