Rit (Vísindafélag Íslendinga) - 01.07.1931, Blaðsíða 19

19
j>the begin of the
eternal snow« on the
E or SE side of
Snæfellsjökull to be
2734 feet (English?)
or 840 m.i)
The difference be-
tween the height of the
firnline on the north-
ern and southern sides
of the glacier is mainly
due to the fact that
the snow-bearing winds
are mostly from E
and NE, while the
rain-bearing winds
come from S and SW.
Besides the southern
side is steeper and therefore very well exposed to the sun.
The Temperature at the Firnlimit. On fig. 8 the
curve A represents the mean temperature at Stykkishólmur in
the course of the year, while curve B shows the same tempera-
ture reduced to the height of 1000 m. above sealevel in the
period May—Oct. It will be seen that this curve passes
through zero at the beginning of june and towards the end
of Sept., so that a snow-melting temperature will prevail in
the intermediate months at the firnlimit of Snæfellsjökull.
The mean temperature ]une—Sept. at the firnlimit of the
glacier will be as follows, if the lapse rate is 0 ,7 per 100 m. rise:
Exposure: E s SW NW NE Mean
Height of firnlimit: 880 950 1070 800 (820) 900
Temp. at sea level: 9° 9° 9° 8,7 8,7 (8°,8)
Temp. at firnlimit: 2,8 2,3 1,4 3,1 (2,8) 2°,5
1) Maclienzie: Reise durch die Insel Island in Sommer 1810, p. 228.
)ohn Barrow jun.: Ein Besuch auf der Insel Island. Sluttgart u. Thii-
ringen 1836, p. 152.