Jökull - 01.12.1961, Page 3

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JÖKULL
Á R S R I T
JÖKLARAN NSÓKNAFÉLAGS ÍSLANDS
11. ÁR REYKJAVÍK 1961
SIGURJÓN RIST:
Rannsóknir á Vatnajökli 1960
Hitamælingar, snjómælingar o. fl.
Investigations on Vatnajökull in 1960
S U M M A R Y
ICE TEMPERATURE. The temperature of
the ice was determined at two locations, 64°
26' 06" N; 17° 09' 23" W and 64° 20' 46" N;
17° 24’ 12" W, at elevations 1614 and 1730
meters, respectively. The temperature was mea-
sured with a termistor device, in two boreholes
drilled for that purpose, lo a dept.h of 27 and
30 meters, respectively. A plastic hose, closed
at its bottom end, and filled with Arctic C
Heavy Oil, was inserted into each hole upon
completion of the drilling, and the oil tempera-
ture at various depths measured 60—72 hours
later. The results are shown on the graph in
Fig. 2. In a second expedition to Vatnajökull, in
October 1960, the temperature was measured
again and was found to be 0°C in both bore-
holes. 2 his result indicates that the Vatnajökull
ice cap is a temperate glacier.
TOPOGRAPHIC SURVEY. Beside some
triangulation work in the Grímsvötn area, the
Grimsvötn basin was mapped, and a curve of
its area and volume vs. elevation was prepared.
The results are reproduced in Fig. 6 and 7.
GRAVIMETRIC SURVEY. A gravimetric
survey was performed along the route through
the southern lowlands — where it was connect-
ed with the main gravimelric network of lce-
land — to the hut Jökulheirnar, at the western
margin of the Vatnajökull ice cap, and from
there along a line to Grimsfjall, across the ice
cap. The Grimsvötn basin and an area to the
east of it were also surveyed. The result of this
survey will be published in one of our next
issues.
DETERMINATION OF THE 1959/1960
WINTER ACCUMULATION. A snow pit
was dug on June 14 near the drillhole at 64°
26' 06" N; 17° 09’ 23" W. A section of that pit
is shoion in Fig. 3.
The limit between the 1958/59—1939/60 ac-
cumulation layers was not determined toith
LArt' 0S SíÁASAFN
24201o
ÍSLANDS