Jökull - 01.10.1998, Side 13

source of many jökulhlaups, which originate from ice
dammed lakes, are induced by geothermal melting, and,
occasionally, are caused by volcanic eruptions. Vatna-
Fig. 6. Location map of monitored glacier termini in Trölla-
skagi and neighbouring areas, northem Iceland.
- Yfirlitskort af jökulsporðum á Tröllaskaga og á nærliggj-
andi svœðum á Norðurlandi þar sem mœlingar á stöðu jökul-
sporða hafa farið fram.
jökull has many surge-type and non-surging outlet
glaciers. Some of them are of mixed type, featuring both
surges and variations induced by climate fluctuations.
Large, lobate, surge-type outlet glaciers flow to the
north and west, but many of the outlet glaciers along the
south-eastem margin are smaller, steeper and non-surg-
ing. Öræfajökull is an independent ice cap with many
steep outlet glaciers to the west, south and east. On the
north side, it merges with the south side of Vatnajökull.
It has an elevation range of more than 2000 m.
Skeiðarárjökull is a large outlet glacier at the south-
em margin of Vatnajökull. Two medial moraines divide
Skeiðarárjökull into three different ice streams. The
middle and west stream are mixed-type as they surge at
irregular intervals, but the terminus variations never-
theless reveal decadal variations in the mass balance.
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1: Leirufjaröarjökull, Drangajökli
2: Kaldalónsjökull, Drangajökli
3: Reykjarfjarðarjökull, Drangajökli
4: Þaralátursjökull, Drangajökli
5: Hyrningsjökull, staður 1, Snæfellsjökli
6: Jökulháls, Snæfellsjökli
7: Norðurkinn, Snæfellsjökli
8: Blágilsjökull, staður 2, Snæfellsjökli
9: Hólatindajökull, Snæfellsjökli
'-3
—I---
1930
1940
I
1950
I
1960
1970
I
1980
I
1990
2000
Fig. 7. Glacier variations of Drangajökull and Snæfellsjökull.
- Jöklabreytingar, Drangajökull and Snœfellsjökull.
JÖKULL, No. 45, 1998
11