Jökull - 01.01.2012, Blaðsíða 93

Mass and volume changes of Langjökull ice cap, Iceland, ∼1890 to 2009
1970 1980 1990 2000
0
200
400
600
800
W
in
te
r
pr
ec
ip
ita
tio
n
(m
m
)
1
2
3
4
S
pe
ci
fic
w
in
te
r
b
al
an
ce
(m
w
e)
1970 1980 1990 2000
2
3
4
5
6
7
S
um
m
er

te
m
pe
ra
tu
re
(°
C
)
-5
-4
-3
-2
-1
0
S
pe
ci
fic
s
um
m
er

b
al
an
ce
(m
w
e)
Figure 12. a) Variation of the measured specific winter mass balance of Langjökull 1996–1997 to 2008–2009,
and winter prcipitation since 1966. b) Variation of the specific summer balance of Langjökull 1996–1997 to
2008–2009 and summer temperture since 1966. Linear trends in bw and bs are shown. The temperature and
precipitation data are from a meteorological station Hveravellir ∼10 km east of Langjökull. (The precipita-
tion and temperature trends shown are from 11 year running averages with triangular weight, 5 year filter).
– Vetrarafkoma Langjökuls og vetrarúrkoma á Hveravöllum (vinstri) og sumarafkoma Langjökuls og meðal-
sumarhiti á Hveravöllum (hægri).
Figure 13. The change in surface elevation from April 1997 to August 2004 (10 m contour lines). The thickening
of the terminus of the southeast outlet is due to a surge in 1998–1999 (Björnsson et al., 2003). – Hæðarbreyt-
ingar á Langjökli frá apríl 1997 til ágúst 2004. Þykknun neðst á Eystri-Hagafellsjökli er vegna framhlaups
jökulsins 1998 til 1999.
JÖKULL No. 62, 2012 91