Jökull - 01.10.1998, Page 19

in the current margins of the ice cap has been identi-
fied. The summit elevation is 1800 m a.s.l.
Blágnípujökull is an outlet glacier facing south-
west. The glacier bifurcates around the mountain
Blágnípa. The eastern branch was monitored for a
short period in the 1930s by Jón Eyþórsson.
Nauthagajökull is a bifurcation from the western
side of Múlajökull. Small surges have been observed.
In the beginning, local farmers did the surveying, but
since 1969, the measurements have been carried out
by members of the Iceland Glaciological Society.
Múlajökull is a surge-type outlet glacier on the
southem side of Hofsjökull. Surges have been record-
ed with a 6-7 year interval for the last few decades.
They only seem to affect the ablation area. The
glacier is monitored at two different locations, one at
the westem side and another one on the eastern side
of the lobe. In the beginning, local farmers did the
surveying, but since 1969, the measurements have
been carried out by members of the Iceland Glacio-
logical Society.
Sátujökull is a broad outlet glacier on the northem
side of Hofsjökull which has been monitored at two lo-
cations, at Lambahraun until 1982 and at Eyfirðinga-
hólar since 1983. The monitoring was initially carried
out by local farmers. Since 1981 it has been done by
members of the Iceland Glaciological Society. The
records from the two locations are combined in Figure
12 since they do not overlap in time.
LANGJÖKULL
Langjökull is an oblong ice cap oriented SW-NE
in central westem Iceland with many outlet glaciers
(Fig. 5). It had an area of 953 km2 in 1973 (Bjömsson,
1978). The maximum elevation is about 1450 m a.s.l.
The area is volcanically active although no postglacial
volcanic activity within the glacier has been pinpoint-
ed. Three of the outlet glaciers have been monitored
o
o
co
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'—' o -
co
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v_

a5
o
c: o
ro > -a o - ^t-
ro
Q
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15
13
E o o -
Z3 C\J
o
o -
------ 1: Gljúfurárjökull, Tröllaskaga
------ 2: Hálsjökull, Tröllaskaga
■ — 3: Tungnahryggsjökull, Tröllaskaga
------4: Barkárdalsjökull, Tröllaskaga
-i-----------1----------1----------1----------1----------1----------1---------
1930 1940 1950 1960 1970 1980 1990 2000
Fig. 13. Glacier variations in Tröllaskagi and neighbouring areas, northern Iceland.
- Jöklabreytingar, skriðjöklar á Tröllaskaga og Norðurlandi.
JÖKULL, No. 45, 1998
17