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Man faar nemlig af Observationerne følgende
Middelværdier :
Dybdeintervaller. Engelske v Meter, r avne. [-Middel-temp.-] {+Middel- temp.+} 0 c. • Midlere Kvæl
stol-mængde observeret [-Kvælstofmængde,-] {+Kvælstof- mængde,+} beregnet. [-Dif-ferents.-] {+Dif- ferents.+}
O ö 6-4 13-07 12-93 —0.14
o—IOO 0—183 2-7 >3-98 ■3-78 —0.20
ioo—300 183—549 1.0 14-15 14.17 0.02
300—600 549—1097 —0.6 14-54 14-54 0.00
600—1000 1097 1829 —0.8 14.04 ■4-58 0-54
1000—1760 1829-3210 —1.4 ’4-38 14.7-2 0.34
Naar den midlere Kvælstofmængde her i de dybere
Lag er funden noget lavere end man skulde vente, da har
dette sin Grund i. at der ved de 5 Observationer No. 17.
22. 33. 36 og 37. alle hidrørende fra Vandprøver fra det
i 1877 undersøgte Strøg, er fundet en ca. 1.5 CC. lavere
Gehalt, end de ved sin Temperatur vilde kunne optage
vecl almindeligt Atmosphæretryk. Forresten vil efter alle
de øvrige Observationer at dømme ogsaa i de større Dyb
Kvælstofmængden tindes at stemme overens med den af
Formelen beregnede.
En lignende Sammenligning1 er af Buchanan gjort
mellem de af ham for de sydlige Have fundne Tal og de
af Bunsen for destilleret Vand opstillede. Der optræder
ved denne Sammenligning især ved de lavere Temperaturer
ikke ubetydelige Ditferentser paa lige op til over 1 CC.
pr. Litre, men disse vil ved Sammenligning med de efter
Forfatterens Formel beregnede Tal saa godt som bortfalde,
idet man faar:
Dybde Fod. ’ Midlere Temperatur. "0. [-Kvælstofmængde-] {+Kvælstof- mængde+} efter Buchanan. [-Kvælstofmængde-] {+Kvælstof- mængde+} efter Formelen. Differents.
600 14.6 11.26 I 1.04 —0.22
1200 13.0 II.71 II.41 —0.30
1800 6-9 13.00 12.81 —0.19
2400 5-1 13.10 13-23 0.13
4800 2-5 13.82 13-82 0.00
derover 1-5 14-37 I4-05 —0.32
Det fremgaar heraf, at Kvælstofmængden, saaledes
som det allerede af Dr. Jacobsen og Andre er antaget,
ikke i mindste Maade retter sig efter de i de store Dyb
herskende Tryk men kun afhænger af Temperaturen. Den
eneste rimelige Fortolkning udelukker Muligheden for. at
Tryk- 0£ Temperaturdifferentser i de under Overfladen
• 1 Ber. Berl. cheni. Ges. — 11 — 410.
as will be seen trom the following Table* showing the
mean values.
Intervals of Depth. Mean Temp. Mean Amount of Sitr. observed. Amount of Nitrogen computed. [-Difference.-] {+Dif- ference.+}
English Fathoms. Metres.
0 0 6.4 13-07 12.93 —0.14
0—100 0—183 2-7 13.98 co <■0 —0.20
100—300 183—540 1.0 14-15 14.17 0 02
300—600 549-1097 —0.6 14-54 14-54 0.00
600—1000 1097 — 1829 —0.8 14.04 14.58 O.54
1000 — 1760 1829—3219 — 1.4 14.38 14.72 O.34
The mean quantity of nitrogen in the deeper strata
proved, accordingly, somewhat lower than there was reason
to expect; but this arose from the proportion determined
by 5 of the observations, viz. Nos. 17. 22. 33. 36. and
37 — all of them referring to samples of water obtained
from the tract of ocean investigated in 1877 — having
been about 1.5 ’ less than could be absorbed at the
same temperature under ordinary atmospheric pressure.
For the rest, judging from all the other observations, the
proportion of nitrogen observed, even at greater depths,
will be found to agree with that computed by the formula.
A similar comparison1 was instituted by Buchanan
between his results for the water of the Southern Seas
and the figures found by Bunsen for distilled water. The
differences resulting from this comparison, more especially
for a low temperature, are considerable, the greatest
reaching 1" per litre: but. on comparing them with the figures
given by the authors formula, they will be found almost
to vanish, as appears from the following Table.
Depth in Feet. Mean Temperature. "’C. Amount of Xitrogen
accord. to Buchanan. Amount of Nitrogen comp. by the Formula. Difference.
600 14.6 11.26 I 1.04 —O.22
1200 13.0 II.71 11-41 —Ö.30
1800 6.9 13.00 12.81 —0.19
2400 5-1 13.10 I3-23 0.13
4800 2-5 13.82 13.82 0.00
Greater Depths. 1-5 14-37 I4-05 . —0.32
Hence the amount of nitrogen, as previously assumed
by Dr. Jacobsen and .others, can in no wise be affected
by the increase of pressure at great depths, but must
obviously be dependent on temperature alone. The results
of these observations exclude, therefore, the possibility of
differences in temperature and pressure at depths below
1 Ber. Berl. cheni. Ges. 11, p. 410.
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