Jökull - 01.01.2005, Page 161

The 2003 NW-Mýrdalsjökull Survey
Table 2. Stations measured in both April and September. –Mælipunktar mældir bæði í apríl og september.
Station Displacement Velocity Direction GPS Wire
(m) (m a−1) ◦ ∆h(m) ∆h(m)
MD00 16.4± 0.8 41.6 15.1 5.3± 1.3 5.5 (fallen)
MD11 21.2± 1.2 53.8 30.8 8.4± 2.5 4.9 (fallen)
MD12 11.7± 0.9 29.5 17.5 4.0± 1.6 4.4
MD03 19.4± 1.8 49.2 7.1 4.5± 2.5 7.7
MD14 11.7± 0.8 29.8 4.5 9.3± 1.3 Missing data
MD07 16.2± 1.0 41.5 -5.4 8.9± 1.4 7.5
a−1, from April to September. MD11 also shifted di-
rection, from 16◦ to 31◦. Other stations had much
smaller direction change, and their velocities changed
by ∼7–8 m a−1.
0 5 10 15
0
20
40
60
80
100
v = 6.5 cm d−1
Days
D
is
pl
ac
em
en
t (
cm
)
Figure 9. Displacement at MD11 over 16 days, from
April 22nd to May 7th, 2003. The velocity from lin-
ear fit to the data is v = 6.5 cm d−1 (R2 = 0.9993).
– Færslur mælipunkts MD11, frá 22. apríl til 7. maí,
2003. Hraðinn út frá jöfnu bestu línu er v = 6.5 cm
d−1 (R2 = 0.9993).
Two types of surface measurements were ob-
tained, one determined by GPS and the other by mea-
suring the poles directly. The error in GPS elevation
in Table 2 is from GPS Pathfinder, from the data col-
lected in September. In most cases the two methods
yield similar results, but the error in vertical measure-
ments using GPS is large, and the software probably
underestimates them.
Figure 10. There were some significant crevasses
on the northern part of Mýrdalsjökull in September.
– Það var umtalsvert af sprungum á norðurhluta
Mýrdalsjökuls í september.
DISCUSSION
Besides obtaining detailed data for the bed topogra-
phy, one of the purposes of this study was to com-
JÖKULL No. 55, 2005 161