Jökull - 01.12.1970, Side 59

from the calculations (Table 3). The glacial
thinning as shown in Table 3 can be consider-
ed as fairly reliable as high as 1100 m, the
error hardly amounts to more than ± 20%. On
the other hand the estimation of the thinning
thereabove is far more inaccurate making the
possible error as high as ± 50%. The volume
reduction of Breidamerkurjökull was then com-
puted with reference to Table 3 and the areal
elevation curve of the glacier (Fig. 10). Accord-
ing to these calculations nearly 40% of the
total reduction has taken place above the 1100
m contour line. With regard to this and poss-
ible errors in the lowering measurements the
computed loss in volume is ± 30% accurate
(Table 2).
yfir lOOOm F771 5Q0-I000m [==| 200-500m F=10-200m
Fig. 7. The margin of the Breidamerkurjökull glacier lobe according to the maps of 1904,
1945 and 1965. The ice margin in the year 1894 is drawn according to the farthermost glacial fea-
tures on Breidamerkursandur. The changes of the shorelines according to the same maps are
also shown.
Mynd 7. Jaðar Breiðamerkurjökuls eins og hann er sýndur á liortunum frá 1904, 1945 og 1965.
Jökuljaðarinn 1894 er dreginn eftir fremstu ummerkjum jökulsins á Breiðamerkursandi. Enn-
fremur sýnir kortið þœr breytingar, sem orðið hafa á strönd Breiðamerkursands skv. kortunum.
JÖKULL 20. ÁR 57