Jökull - 01.12.1968, Qupperneq 66

7. mynd. Leiðangursmenn, að ljósmyndara undanskildum, í gíg sunnan Þröskulds.
The expedition members posirig for the cameraman in a recent crater.
Ljósm. Hjálmar R. Bárðarson, 14. júní 1968.
Það er trúa mín, að vegna þátttöku eðlis-
fræðinganna i þessum leiðangri og rannsókna-
starfs þeirra muni leiðangurinn síðar verða tal-
inn í tölu þeirra, er markað hafa þáttaskil í
þekkingu okkar á Vatnajökli og vera að því
leyti sambærilegur við leiðangrana 1936 og
1951. Með sænsk-íslenzka leiðangrinum 1936
og framhaldi hans næstu tvö sumur var lagður
grundvöllur að þekkingu okkar á hag (regime)
Vatnajökuls. íslenzk-franski leiðangurinn 1951
mældi þykkt jökulsins á ijölmörgum stöðum,
en í leiðangrinum 1968 var í fyrsta sinn beitt
ísótóparannsóknum til könnunar eðlis og
ástands vors mesta jökuls.
S U M M A R Y
THE VATNAJÖKULL EXPEDITION
JUNE 1-14, 1968
S. Thorarinsson
This expedition was arranged jointly by the
Iceland Glaciological Society and the Division
400 JÖKULL 18. ÁR
of Physics of the Science Institute, University
of Iceland. Its main aim was to sample firn
ancl ice from pits and drillholes at various
places on Central and Northern Vatnajökull
for determination of their deuterium and tri-
tium content. This work was carried out by
Bragi Árnason ancl Páll Theodórsson with the
assistance of K. Benediktsson ancl members o£
the Iceland Glaciological Society. Main leader
was S. Tliorarinsson ancl navigator Carl J. Ei-
ríksson. Participants were 14 itl all.
Fig. 2 shows the route on Vatnajökull and
the situation of the places where samples were
taken besides the thickness of the winter accu-
mulation 1967/68 (in cm) and its watervalue (in
mm). Levelling of the line Grídarhorn-Depill in
the Grímsvötn Caldera was carried out as usual.
Between June 16, 1967 and June 6, 1968 the
water level in the caldera had risen nearly
14 m, or on average 3.9 mm/day.
Mention is made of a big solfatara whicli
was first observed in the Kverkfjöll solfatara
area on May 24, 1968 (Fig. 5).
Á