Jökull


Jökull - 01.01.2019, Page 134

Jökull - 01.01.2019, Page 134
Jöklabreytingar 2017–2018 Vatnajökull Brókarjökull – Fært var inn að Brókarjökli og mögu- legt að ganga meðfram sporðinum dágóðan spöl með GPS-tæki. Skálafellsjökull – Farið var til mælinga við Skála- fellsjökul, en aðgengi er erfitt sökum jökullónsins og óvissa með niðurstöður mælinga. Heinabergsjökull – Að venju fóru nemendur við Framhaldsskóla Austur-Skaftafellssýslu til mælinga ásamt Eyjólfi Guðmundssyni, en einnig þar er fjar- lægð að jökli mikil yfir lónið. Fláajökull – Mælingar við Fláajökul tókust vel, lónið fer stækkandi. Lambatungnajökull – Bergur Pálsson leggur til að skilgreindur verði nýr viðmiðunarpunktur fyrir mæl- ingar framan Lambatungnajökuls, en lónið gerir mæl- ingamönnum erfitt um vik. Rjúpnabrekkujökull – Farið var til mælinga heldur seint á haustmánuðum og snjóhula yfir öllu og því ógerlegt að áætla jökulröndina. Glacier variations 1930–1970, 1970–1995, 1995– 2017 and 2017–2018 The Icelandic Glaciological Society received reports on 46 measurements sites of glacier front variations in the autumn of 2018. Glacier retreat was observed at 33 survey sites whereas advances where reported from 5 sites, and 4 showed no signs of change. Snow- covered glacier margins, bad weather or floating ice- bergs in the proglacial lakes prevented measurement at a few sites. One new site was added to the network, the western part of Þórisjökull. Gljúfurárjökull séður úr hlíðum Gljúfurárdals, Blekill fyrir miðju. Jökullinn var mældur að vanda samhliða göngum í Sveinsstaðaafrétt. Sporðurinn hörfaði um rúmlega 10 m, en rúmlega 40 m árið á undan. – Gljúfurárjökull viewed from the slopes of the Gljúfurárdalur valley, Mt. Blekill in the centre. The position of terminus was measured as usual during the sheep round-up of Sveinsstaðaafréttur pasture. The glacier had retreated by approximately 10 m, but over 40 m the previous year. Ljósm./Photo: Árni Hjartarson, 8. september 2018. JÖKULL No. 69, 2019 133
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