Jökull - 01.01.2001, Side 134

25 years each time advancing about 1 km. Most of the
advance this time, 1,165 m, was covered in about 6
weeks, averaging more than 25 m per day. The snout
now occupies a similar position as it did in the early
1940s. The surge period of this outlet glacier is quite
irregular as there were no surges in the period 1934–
1974 and then substantial surges in 1975, 1980 and
1999.
Surge continues in Kaldalónsjökull and Leiru-
fjarðarjökull outlet glaciers from Drangajökull ice cap
in the northwest peninsula for the fifth consecutive
year.
Results of mass balance measurements that are
carried out by the National Energy Authority (Oddur
Sigurðsson, 1989, 1991 and 1993 and Oddur Sigurðs-
son and Ólafur Jens Sigurðsson 1998) and the Science
Institute of the University of Iceland (Helgi Björnsson
et al., 1993, 1995a, 1995b, 1997 and Science Institu-
te, University of Iceland, Helgi Björnsson and Finnur
Pálsson pers. comm.) are reported in Table 1.
HEIMILDIR
Gunnar Páll Eydal 1998. Hagafellsjöklarnir í ham.
Fréttabréf Jöklarannsóknafélags Íslands nr. 69,
2-4.
Helgi Björnsson, Finnur Pálsson, Magnús T. Guð-
mundsson og Hannes H. Haraldsson 1997.
Afkoma, hreyfing og afrennsli á vestan- og
norðanverðum Vatnajökli jökulárið 1995-1996.
Raunvísindastofnun Háskólans, RH-24-97, 57
pp.
Helgi Björnsson, Finnur Pálsson, Magnús T. Guð-
mundsson og Hannes H. Haraldsson 1998. Mass
balance of western and northern Vatnajökull, Ice-
land, 1991-1995. Jökull 45, 35-58.
Helgi Björnsson, Finnur Pálsson, Óliver Hilmars-
son og Hannes H. Haraldsson 1999. Afkomu- og
hraðamælingar á Langjökli jökulárið 1998-1999
Raunvísindastofnun Háskólans, RH-19-99 18 pp.
Helgi Björnsson og Finnur Pálsson, Raunvísinda-
stofnun Háskólans, 2000. Munnlegar upplýsing-
ar/pers. comm.
Oddur Sigurðsson 1989. Afkoma Hofsjökuls 1987-
1988. Orkustofnun, OS-91005/VOD-02 B, 10pp.
Oddur Sigurðsson 1991. Afkoma Hofsjökuls 1988-
1989. Orkustofnun, OS-91052/VOD-08 B, 19pp.
Oddur Sigurðsson 1993. Afkoma nokkurra
jökla á Íslandi 1989-1992. Orkustofnun,
OS-93032/VOD-02, 26 pp.
Oddur Sigurðsson og Ólafur J. Sigurðsson 1998. Af-
koma nokkurra jökla á Íslandi 1992-1997. Unnið
fyrir auðlindadeild Orkustofnunar. Orkustofnun,
OS-98082, 36 pp.
134 JÖKULL No. 50