Spidsbergen, østenom Grønlands Østkyst. over Island! og 
Det omfatter de Strøg 
af Havet, hvor den varme Havstrøm fra Nordatlanterhavet 
trænger ind paa højere Bredder mellem Norge og Grønland- 
Spidsbergen og de af denne Havstrøm beskyllede Kyster.? 
Hvorvidt denne ejendommelige Form for Lufttrykkets 
daglige Variation tihører det norske Hav og dets Sommer- 
maaneder® alene, maa fremtidige Undersøgelser vise. De 
Eene, hvor man skulde søge den, maatte, ifølge Buchans 
Karter, være Beringshavet og den nordligste Del af det 
pacitiske Ocean og muligens et Strog i den sydlige Del af 
det indiske og pacitiske Ocean, omkring 50° sydlig Bredde. 
Den sydlige Grænse for det norske Hays Felt kunde maaske 
bestemmes ved Observationer fra Skibe der sejle mellem 
Skotland og Newfoundland. 
vestenom og søndenom Færøerne. 
Til Forklaringen af det Fænomen, som gjennem vor 
Expeditions Barometermaalinger har vist sig, kan jeg ikke 
anføre noget bedre, end hvad Professor J. Hann siger 1 
sin Afhandling “Ueber den tåglichen Gang des Luftdruckes, 
ete. auf den Plateaux der Rocky Mountains, aus dem 
LXXXITT Bande der Sitzb. der k. Akad. der Wissensch. 
IT Abth. Mårz-Heft. Jahre. 1881,” Side 10: 
“Kn lignende Proces — som i Dalene — finder Sted 
mellem Land og Hav; om Dagen flyder i de øvre Lag 
Luften over Landet hen mod Havet og bevirker der en 
1 Vesterønland har samme Periode som Fjordene: 
—0.14 . + 0.12 
Of 20105 
Godthaab: 0:02 
+ 0.12 
* Hvorledes Perioden faldt under Expeditionens Rejser i de for- 
skjellige Strøg af Havet, sees af nedenstaaende Tabel. 
Jacobshavn: 
Tid. Strøg. Min. Max. 
1876 Juni 28— Juli 8: Christiansund til Færøerne 3" am., 1* p.m. 
» Juli 17—26; Færøerne til Island posen: 
, Aug. 4—13; Island til Namsos il gs, Il før 
1877 Juni 16— Juli 26; udenfor Norges Kyst 6 am., 4 p.m. 
s Juli 25— Aug. 9; Norge — Jan Mayen 5 Ahi 8 pin 
1878 Juni 28— Juli 7; Østhavet 6 am. 4 p.m. 
s Juli 14—24; Nordkap — Grønlandshavet (AoW, joer 
» Juli 30— Aug. 25; Spidsbergen — Grønlandsh. 6 am., G p.m. 
TF PWN, 1 jpn 
Med Undtagelse af Strøget Færøerne — Island, hvor Expeditionen 
laa 4 Dage vejrfast ved Vestmannagerne og idethele var paa større 
vestlige Længder (udenfor Feltet?), falder Minimum overalt om Mor- 
genen og Maximum om Eftermiddagen. I Havet udenfor Spidsbergens 
Vestkyst fandtes 2 Maxima og 2 Minima. Disse 2 sidste ere omtrent 
lige sterkt udprægede, medens Middagsmaximumet er betydelig mere 
fremtrædende end Midnattens. Det er her at bemerke, at Expedi- 
tionen laa til Ankers 11/, Dag ved Norskøerne, 1 Dag i Magdalena 
Baj og 4 Dage i Advent Baj, hvilke Dages Observationer indgaa i 
ovenstaaende Resultat. 
> Medium af December, Januar og Februar: 
— 0.06 
— 0.10 
— 0.08 
+- 0.08 
Skudesnes + 0.13 
+ 0.06 
Christiansund 
110 
Teeland,! and west and south of the Færoes. This tract 
comprises such parts of the Norwegian Sea through which 
the warm current from the North Atlantic flows into higher 
latitudes, between Norway and Greenland-Spitzbergen and 
the coasts washed by the said current.” 
Whether this peculiar feature attending the daily 
variation of the pressure of the air, be exclusively charac- 
teristic of the Norwegian Sea and the summer months? in 
that region, is a question that future investigations must 
decide. The regions in which, according to Buchan’s chart, 
it should be sought for, are Bering’s Sea and the most 
northerly part of the Pacific Ocean; possibly, too, a tract 
in the southern part of the Indian and Pacific Oceans, in 
about 50° S. lat. The southern boundary of the tract in 
the Norwegian Sea might, perhaps, be determined by means 
of observations taken on vessels sailing between Scotland 
and Newfoundland. 
As an explanation of the phenomenen that asserted 
itself in the barometrical observations taken on the Norwegian 
Expedition, I can adduce nothing better than the remarks 
of Professor J. Hann in his Memoir “Ueber den tiiglichen 
Gang des Luftdruckes ete., auf den Plateaux der Rocky 
Mountains, aus dem LXXXIII Bande der Sitzb. der k. 
Akad. der Wissensch., IT Abth., Mårz-Hett., Jahrg. 1881,” 
p. 10: — 
“A process similar to that in the valleys goes on 
between land and sea; in the day time the air in the upper 
strata above the land flows towards the sea, occasioning an 
1 West Greenland has the same period as the Fjords, viz. — 
JEQØ Gid sb Oe 
J0012 Of | 005 
? The period on the cruises of the Expedition in the different 
Godthaab: — 
Jacobshavn: — 
parts of the Norwegian Sea, is seen from the Table given below. 
Tract. 
1876 June 28— July & Christiansund to the Færoes. 
» July 17—26 Færoes to Iceland. 
» Aug. 4—13 Iceland to Namsos. 
1877 June 16— July 26 Off the Coast of Norway. 
Time. 
» July 25— Aug. 9 Norway — Jan Mayen. 
1878 June 28— July 7 The Barents’ Sea. 
July 14—24 North Cape — Greenland Sea. 
, July 30— Aug. 25 Spitzbergen — Greenland Sea. 
Saving the tract between the Færoes and Iceland, where the 
Expedition lay wind-bound for 4 days at the Vestmanna Islands, and 
was indeed on the whole passage in more westerly longitude (without 
the district in question?), the minimum occurred everywhere in the 
morning and the maximum in the afternoon. In the sea off the west 
The two 
latter have about equal prominence, whereas the noon maximum is 
coast of Spitzbergen, there were 2 maxima and 2 minima, 
much more prominent than the midnight maximum. I must not omit 
to state, that the Expedition lay a day and a halt at anchor at the 
Norway Islands, one day in Magdalena Bay, and 4 days in. Advent 
Bay, the observations taken on these days being comprised in the 
result given above. 
> Mean for December, January, and February: — 
=o 00% 208 
O10 201030 10106 
Skudesnes: — 
Christiansund: — 
