Jökull - 01.10.1998, Page 11

clear signal of climate changes. Two farmers, a father
and a son, have carried out the measurements since
1961, but prior to that several people did the readings.
The mark at location 1 was moved in 1963 and there
is a one year gap in the record at this point in time
when the glacier was slowly retreating according to
observations at the terminus that year. The gap was
filled with the average rate of retreat of two years pre-
ceding and two years following the gap.
Hólatindajökull, Blágilsjökull and Norðurkinn on
the westem and northern margins of the ice cap were
measured for a some time between 1930 and 1954.
Hymingsjökull and Blágilsjökull were monitored
at two and three adjacent locations, respectively, in the
1930s and 1940s, in order to obtain a better picture of
the average variations of the termini. Hyrningsjökull
is currently monitored at one location, but observa-
tions of Blágilsjökull were abandoned in 1954.
EYJAFJALLAJÖKULL
Eyjafjallajökull is an ice cap in central southem
Iceland with many outlet glaciers (Fig. 3). The area
was 78 km2 in 1973 (Björnsson, 1978). Two of the out-
let glaciers have been monitored. The ice cap covers
the summit of a central volcano that has empted once
in historical time (1821-1823). The summit elevation
is 1666 m a.s.l.
Gígjökull is an outlet glacier that runs to the north
out of the summit crater. The tongue calves into a
proglacial lake. It has been monitored since 1930,
Fig. 4. Location map of Vatnajökull.
-Yfirlitskort afVatnajökli.
JÖKULL, No. 45, 1998
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