Jökull - 01.01.2019, Page 17

Guðmundsson et al.
Figure 12. The ice margin of Kvíárjökull, Hrútárjökull and Fjallsjökull at different times (dashed coloured
curves) and glacial lakes in the foreland (coloured areas). For explanations and credits see Figure 3. – Jaðar
Kvíárjökuls, Hrútárjökuls og Fjallsjökuls á mismunandi tímum (slitnir, litaðir ferlar) og þróun lóna við jökul-
jaðarinn (lituð svæði). Sjá nánari skýringar við 3. mynd.
shrank and eventually disappeared with the lowering
of the glacier (F. Björnsson, 1998; photo collection of
F. Björnsson). This lake is not shown on the maps of
the Danish General Staff from 1904 (DGS, 1905a) or
on the AMS (1951) map based on aerial images from
1945.
Photographs by F. Björnsson and M. Maack from
1938 and 1939 show a lake south of the ridge that sep-
arated Hrútárjökull and Fjallsjökull at this time (Fig-
ures 14 and 16). This lake must have been short-lived
since it is not shown on the AMS (1951) map of the
area based on aerial images from 1945. The foreland
in front of Hrútárjökull is hilly and rather permeable
to water, and lakes are therefore not easily formed.
A small lake formed in dead ice in front of the
southernmost part of the terminus in 2003 in a simi-
lar manner to the formation of the lake by Kvíárjökull
described above. This lake grew from ∼0.001 km2
in 2008 to ∼0.13 km2 in 2018 (Landsat 8, SPOT5,
aerial images from Loftmyndir ehf.). As for Virk-
isjökull and Falljökull, the subglacial topography at
Hrútárjökull does not feature a significant subglacial
16 JÖKULL No. 69, 2019